A Guide to Pressure Treated Timber - L&G Forest Products

www.ptgtreatments.co.uk

A Guide to Pressure Treated Timber


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Important Information


Fire Retardant Treatments

Preservative Treatments

Index

Fire Retardantsfor Interior and Exterior Applications

Primer for Timber


Fire Retardant Treated Wood Products Osmose FirePRO* fire retardant treated wood (FRTW) products are pressure impregnated with an Osmose FirePRO humidity resistant high temperature fire retardant chemical formulation based on proprietary Osmose technology.

Independent testing performed in accordance with industry standards has shown Osmose FirePRO FRTW products exhibit fire performance properties without compromising other critical engineering properties such as strength, durability, corrosivity, and hygroscopicity. Osmose FirePRO is a WPA Approved Product under their Flame Retardant Quality Scheme.

Application

Osmose FirePRO FRTW products are permitted for use in above ground interior applications where the adopted building regulations permit the use of wood products or fire retardant wood products such as: roof systems, sheathing, joists etc.It can also be used in other interior applications such as exhibition stands. The specifier and/or end user is responsible for reviewing the test data on Osmose FirePRO FRTW products to determine if they are acceptable for the intended end use. +Osmose FirePRO treated wood may be used in above ground external situations where it is effectively protected from direct rainfall and weathering. External grade wood coatings may give adequate long term protection, in combination with a programme of planned maintenance. Check with a coating manufacturer before use. Osmose FirePRO Standards and Specification Information

Osmose FirePRO fire retardant treated wood products (FRTW) have been tested to BS EN 13501-1:2002 Fire classification of construction products and building elements.

These tests are commonly referred to as ‘reaction to fire tests’. Reaction to fire tests are commonly called up in regulations in both the building and transport sectors. The classifications of flammability are A1, A2, B, C, D, E and F.

This table gives an overview of the classifications:

Currently, Osmose hold approvals for the following substrates treated with Osmose FirePRO - • Softwood Plywood • Far Eastern Plywood • Birch Plywood • Solid softwood • Softwood cladding (see note on external use+)

Please check with Osmose for specific sizes tested and approval classification achieved. Osmose FirePRO treated wood can also be CE marked.

Further materials are undergoing testing. Please ask for an updated list.

Osmose FirePRO is able to meet the requirements of HR (humidity resistant) treatment and DI (dry internal) specifications. Osmose FirePRO is approved by London Underground as a suitable fire retardant treatment for timbers to be used in their construction and maintenance projects, approval reference ID 1327.

Humidity Resistant

Classification: (European)

Transposition to BS476 classification

A1 Non combustible

A2 Very limited combustibility

B Class 0

C Class1

D Class3


In what applications can FIREPRO® fire retardant treated timber be used?FIREPRO fire retardant treated timber is permitted for use in above ground interior applications where the adopted building regulations permit the use of timber products or fire retardant timber products such as: roof systems, cladding, sheathing, joists etc. It can also be used in other interior applications such as exhibition stands. The specifier and/or end user is responsible to review the test data on FIREPRO fire retardant treated timber products to determine if they are acceptable for the intended end use.

FIREPRO fire retardant treated timber products may be used in above ground external situations where it is effectively protected from direct rainfall and weathering. External grade timber coatings may give adequate long term protection, in combination with a programme of planned maintenance. Check with a coating manufacturer before use.

How do fire retardant treatments for timber work?When subjected to a fire the protection technology in fire treated timber reacts with the combustible gases and tars normally generated by untreated wood converting them to carbon char, carbon dioxide and water vapour. The layer of char formed on the timber insulates and retards the process of combustion reducing ignition, the rate of surface spread of flame and the amount of heat released. This should provide increased time for escaping from a burning structure or building.

What standards do the FirePro fire retardant treatments meet?The fire performance for all materials that are to be used in buildings, including wood and wood based panel products, are stated in Document B of the UK Building Regulations. Classifications are:• Wall and ceiling linings are Class 1 Surface Spread of Flame in accordance with BS476:Part 7 or Euroclass C in accordance with BS EN 13501-1: 2002.• Higher risk areas such as escape routes and staircases are Class 0 BS 476: Parts 6 & 7 or Euroclass B in accordance with BS EN 13501-1: 2002

What are Euroclasses and how do they relate to British Standards?Under the Construction Products Directive, there is a desire for European harmonisation of standards for fire retardant treatment of timber, these are known as Euroclasses B & C. To meet Euroclass B or C Specifications, timber/plywood is tested to EN ISO 11925 (Ignitability Test) and BS EN 13823:2002 (SBI or Single Burning Item Test). The SBI test records parameters relating to the rate of fire growth, lateral flame spread and total heat release.Euroclass Classifications are in accordance with BS EN 13501-1 (Fire classification of construction products and building elements). The thresholds for compliance in relation to the above SBI criteria are higher for Euroclass B than for Euroclass C. Therefore, by definition, if timber/plywood conforms to Euroclass B then it also conforms to Euroclass C.

In England and Wales, the fire requirements for buildings are dealt with by Approved Document Part B to the Building Regulations - Class 0 and Class 1. Euroclass B transposes to Class 0 and Euroclass C transposes to Class 1.NB: It is important to understand that you must carry out testing against European Standards to achieve a European Classification.

Can you fire treat OSB or MDF?OSB, MDF or other panel products produced from wood fibres or flakes cannot be pressure treated with fire retardant chemistry. Does fire retardant treatment alter the appearance of the timber? FirePro fire retardant treatment does not alter the general appearance of the wood. However, some discoloration and/or surface deposits may occur during the treatment process. If the treated timber is going to be painted or stained, coating manufacturers recommend that the surface of any material should be clean and dry. Therefore, we recommend that the surface of the treated timber be either cleaned with a damp cloth or a fine grade sand paper. Follow the coating manufacturer’s directions for proper application.

The Treatment Process

Osmose FirePRO treating solution is applied to timber products in an industrial controlled treatment process using vacuum pressure impregnation, shown here. Osmose FirePRO FRTW products must be air or kiln dried after treatment to ensure the properties of Osmose FirePRO are maintained.

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The timber is transferred into the treatment vessel.

A vacuum pulls the air out

of the vessel.

Osmose FirePRO solution

fills the vessel.

The vessel is pressurised forcing the solution

into the timber.

The solution is removed and final vacuum is

applied removing excess.

The timber has now been treated with

Osmose FirePRO solution.

Humidity Resistant

FAQ Section


FirePRO User Guide

What is Osmose FirePRO Treated Wood ? Osmose FirePRO treated wood has been treated by the correct application and drying of Osmose FirePRO fire retardant.

Osmose FirePRO treated wood products have the following properties: • Fire Performance • Low Smoke Development Values • Strength Durability • Low Hygroscopicity • Resistant to fastener corrosion

Osmose FirePRO is a proprietary blend of fire retardants which is applied as a water-based solution by vacuum pressure impregnation. Osmose FirePRO treated wood products are designed to greatly enhance safety when fire protection is necessary. In correct applications, Osmose FirePRO treated wood and plywood provide excellent flame spread reduction as well as decreased smoke development. Osmose FirePRO treated products are intended for use in areas not exposed to weather such as roof systems, studs and flooring joists and other weather protected applications, not in direct contact with the ground.

Various plywoods and solid timber species treated with Osmose FirePRO have been tested by an accredited independent test facility in accordance with the European Classification BS EN 13501-1:2002 Fire classification of construction products and building elements.

With correct application, two levels of fire protection performance can be achieved depending on loadings achieved.

Osmose FirePRO fire retardant treated wood and plywood are intended for interior use or weather protected exterior applications only. Once the product has been kiln dried after treatment, exposure to rain, snow, or mud must be avoided.

Osmose FirePRO treated wood products must be stored indoors or under sheets that offer protection from the elements.

Osmose FirePRO does not significantly reduce strength of treated timber and is non-corrosive to metal fastenings and fixings.

The visual appearance of wood products is generally unaffected by treatment with Osmose FirePRO, however prolonged use of Osmose FirePRO solution may impart a yellowish to brown colour to certain wood species. This is simply due to a build up of wood extractive and resin and has no impact on intended performance of the product.

The surfaces are free of excessive surface deposits or chemical blooming. Upon close examination, small crystalline particles may be seen on the wood surface but this is a normal feature of the relatively high chemical loading needed for fire protection.

Handling Osmose FirePRO Treated WoodOsmose FirePRO treated wood products pose the same hazards as untreated wood. Engineering controls and protective equipment should be used to minimize airborne wood dust.

BS EN 13501-1:2002Classification

Class B

Class C

Equivalent toBS476 Classification

Class 0

Class 1


IMPORTANT INFORMATIONWear gloves when working with wood. Wear a dust mask and goggles when cutting or sanding wood. Wash work clothes separately from other household clothing before re-use. Only fire retardant treated wood products that are visibly clean and free of surface residue should be used.If wood products become wet during construction, they should be replaced.Some fire retardant may migrate from the treated wood into soil/water or may dislodge from the treated wood surface upon contact with skin. Wash exposed skin areas thoroughly.Fire retardant treated wood products should not be used where they may come into direct contact or indirect contact with drinking water, except for uses involving incidental contact.Do not use fire retardant treated wood products under circumstances where they may become a component of food, animal feed, or beehives.Do not use fire retardant treated wood products for mulch.

Effective Use of Osmose FirePRO Treated Wood

CuttingOsmose FirePRO treated timber should not be machined or milled, therefore every attempt should be made to perform these operations before treatment. There are no limitations on the milling or cutting of plywood.

Metal Fastenings and HardwareOsmose FirePRO is non-corrosive to metal fastenings and fixings. Use fixings and other hardware which are in compliance with building regulations for the intended use. Use fixings, hardware or any metal products as recommended by their manufacturer.

FinishingUnder normal temperature and humidity conditions most latex and oil-based paints and stains, can be used with Osmose FirePRO fire retardant treated wood products. Before you start, we recommend that you apply the finishing product to a small test area before finishing the entire project, to ensure that it provides the intended result, before proceeding.

Disposal Do not burn fire retardant treated wood products. All sawdust and construction debris should be cleaned up and disposed of after construction.Fire retardant treated wood products may be disposed of in landfills or burned in commercial or industrial incinerators or boilers in accordance with National and local regulations.For up to date information please contact the Technical Services Department.

REACH StatementIn compliance with Article 33 of REACH: Osmose FirePRO preserved wood is an article which contains integral boric acid and it is considered that sufficient information is provided in this document to allow safe use of the article.

FirePRO User Guide

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T: 07921 308436 E: [email protected] - Perth, Tayside

T: 01273 422296 E: [email protected] - Brighton, East Sussex


Classification: (European)

Transposition to BS476 classification

A1 Non combustible

A2 Very limited combustibility

B Class 0

C Class1

D Class3

Exterior Fire Retardant

Fire Retardant Treated Wood Products Exterior Fire-X fire retardant treated wood (FRTW) products are pressure impregnated with Exterior Fire-X, a leach resistant (LR) exterior grade high temperature fire retardant chemical formulation. Exterior Fire X is a listed product in the 2012 UK Wood Protection Association Flame Retardants Manual.

Independent testing performed in accordance with industry standards has shown that Exterior Fire-X FRTW products exhibit enduring fire performance properties without compromising other critical engineering properties such as strength, durability, corrosivity and hygroscopicity.

ApplicationExterior Fire-X FRTW products are permitted for use in above ground interior or exterior applications where the adopted building regulations permit the use of wood products or fire retardant wood products, such as: cladding, shingles, playground equipment, sheathing, joists etc. The specifier and/or end user is responsible for reviewing the test data on Exterior Fire-X FRTW products to determine whether they are acceptable for the intended end use. Exterior Fire-X treated timber has been shown to perform well in the standard fire retardant tests ASTM E84, BS 476 Part 7 and BS EN 13501-1. Treated timber has also maintained its fire retardant performance in the ASTM D2898 accelerated weathering test, used to approve leach resistant (LR), exterior grade fire retardant treatments. Standards and Specification InformationExterior Fire-X Fire Retardant Treated Wood products (FRTW) have been tested to BS EN 13501-1:2002 ‘Fire classification of construction products and building elements’ and/or BS 476 Part 7 ‘Surface Spread of Flame of Products’.

These tests are commonly referred to as ‘reaction to fire tests’. Reaction to fire tests are commonly called up in regulations in both the building and transport sectors. The classifications of flammability are A1, A2, B, C, D, E and F.

This table gives an overview of the classifications:

Currently, Exterior Fire-X FRTW holds UK test approvals for the following substrates- • Solid softwoods • Western Red Cedar • Solid Southern Pine • Southern Pine Plywood

Please check with Osmose for specific sizes tested and approval classification achieved. Exterior Fire-X treated wood can also be CE marked. Further materials are undergoing testing. Please ask for an updated list.

Exterior Fire-X is able to meet the requirements of HR (humidity resistant) treatment, DI (dry internal) and LR (leach resistant) specifications.


Exterior Fire Retardant

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A vacuum pulls the air out

of the vessel.

Exterior Fire-X solution fills the vessel.

The vessel is pressurised forcing the solution

into the timber.

The solution is removed and final vacuum is applied

removing excess.

The timber has now been treated with

Exterior Fire-X solution.

The Exterior Fire-X treated timber goes

through a kiln process.

The Exterior Fire-X Treatment ProcessExterior Fire-X treating solution is applied to timber products in an industrial controlled treatment process using vacuum pressure impregnation, shown here. Exterior Fire-X FRTW products must be kiln dried after treatment to fix the fire retardant into the wood.

In what applications can Exterior Fire-X fire retardant treated timber be used?

Exterior Fire X FRTW products are permitted for use in above ground interior or exterior applications where the adopted building regulations permit the

use of wood products or fire retardant treated wood products, such as: cladding, shingles, playground equipment, sheathing, joists etc. The specifier and/or

end user is responsible for reviewing the test data on Exterior Fire X* FRTW products to determine whether they are acceptable for the intended end use.

How do fire retardant treatments for timber work?

When subjected to a fire the protection technology in fire treated timber reacts with the combustible gases and tars normally generated by untreated wood

converting them to carbon char, carbon dioxide and water vapour. The layer of char formed on the timber insulates and retards the process of combustion

reducing ignition, the rate of surface spread of flame and the amount of heat released. This should provide increased time for escaping from a burning

structure or building.

What standards do the Exterior Fire X fire retardant treatments meet?

The fire performance for all materials that are to be used in buildings, including wood and wood based panel products, are stated in Document B of the

UK Building Regulations. Classifications are: • Wall and ceiling linings are Class 1 Surface Spread of Flame in accordance with BS476:Part 7 or Euroclass C in

accordance with BS EN 13501-1: 2002. • Higher risk areas, such as escape routes and staircases, and external cladding are Class 0 BS 476: Parts 6 & 7 or

Euroclass B in accordance with BS EN 13501-1: 2002

What are Euroclasses and how do they relate to British Standards?

Under the Construction Products Directive, there is a desire for European harmonisation of standards for fire retardant treatment of timber, these are

known as Euroclasses B & C. To meet Euroclass B or C Specifications, timber/plywood is tested to EN ISO 11925 (Ignitability Test) & BS EN 13823:2002

(SBI or Single Burning Item Test). The SBI test records parameters relating to the rate of fire growth, lateral flame spread and total heat release. Euroclass

Classifications are in accordance with BS EN 13501-1 (Fire classification of construction products and building elements). The thresholds for compliance in

relation to the above SBI criteria are higher for Euroclass B than for Euroclass C. Therefore, by definition, if timber/plywood conforms to Euroclass B then

it also conforms to Euroclass C. In England and Wales the fire requirements for buildings are dealt with by Approved Document Part B to the Building

Regulations - Class 0 and Class 1. Euroclass B transposes to Class 0 and Euroclass C transposes to Class 1. NB: It is important to understand that you must

carry out testing against European Standards to achieve a European Classification.

Can you fire treat OSB or MDF?

OSB, MDF or other panel products produced from wood fibres or flakes cannot be pressure treated with fire retardant chemistry.

Does fire retardant treatment alter the appearance of the timber?

Exterior Fire X fire retardant treatment does not alter the general appearance of the wood. However, some discoloration and/or surface deposits may occur

during the treatment process..

FAQ Section


Exterior Fire RetardantUser Guide

What is Exterior Fire-X Fire Retardant Treated Wood? Exterior Fire-X is a pressure impregnated fire retardant treatment for timber used in applications directly exposed to the weather or high humidity, outdoors as well as indoors.

Exterior Fire-X fire retardant treated wood has been produced by the correct application of Exterior Fire-X Fire Retardant in an industrial, controlled treatment process using vacuum pressure impregnation, and then kiln dried.

Various plywood and solid timber species treated with Exterior Fire-X have been tested by an accredited independent test facility in accordance with the European Classification BS EN 13501-1:2002 Fire classification of construction products and building elements.

With correct application, two levels of fire protection performance can be achieved depending on loadings

Exterior Fire-X treated timber is a leach resistant fire retardant treatment and may be installed in situations with direct exposure to precipitation.

IMPORTANT INFORMATIONWear gloves when working with wood. Wear a dust mask and goggles when cutting or sanding wood. Wash work clothes separately from other household clothing before re-use. Only fire retardant treated wood products that are visibly clean and free of surface residue should be used,Some fire retardant may dislodge from the treated wood surface upon contact with skin. Wash exposed skin areas thoroughly.Fire retardant wood products should not be used where they may come into direct contact or indirect contact with drinking water.If wood is to be used in an interior application and becomes wet during construction, it should be allowed to dry before being covered or enclosed.Mould growth can and does occur on the surface of many products, including treated or untreated wood, during prolonged surface exposure to excessive moisture conditions. To remove mould from treated wood surfaces, wood should be allowed to dry. Do not use treated wood under circumstances where the flame retardant may become a component of food, animal feed or beehives.Do not use treated wood as mulch.

Effective Use of Fire Retardant Treated Wood CuttingTreated wood should not be cut or otherwise reworked as this will expose untreated wood, reducing the effectiveness of the flame retardant treatment. Rip-sawing, thicknessing and planing are not permitted. Cross cutting, joint cutting and hole drilling are permitted. Precautions should be taken to keep airborne dust levels below Occupational Exposure Standards for wood dust. In particular, avoid inhalation of dust when using high speed cross-cut saws or mechanical sanders.

BS EN 13501-1:2002Classification

Class B

Class C

Equivalent toBS476 Classification

Class 0

Class 1


Exterior Fire-X User Guide

Metal Fastenings and HardwareCertain metal products (including fasteners, hardware and flashing) may corrode when in direct contact with wood exposed to water. Use fixings and other hardware which are in compliance with building regulations for the intended use. Use fixings, hardware or any metal products as recommended by their manufacturer. Stainless steel and hot dipped galvanised fixings are recommended.

FinishingExterior Fire-X treated wood can be finished with good results. Precautions and procedures for finishing Exterior Fire-X are similar to those for untreated wood. As with untreated wood, finish performance is highly dependent on moisture content, species, surface preparation, application method, and finishing system.

Moisture content at time of painting or staining is the most important factor in determining performance, whether treated or untreated. Unfortunately, post-installation drying and moisture content stabilization is often overlooked in the rush to complete a construction project. If moisture content is too high, finishing results will be poor.

Exterior Fire-X treated wood should not be painted or stained immediately after installation. Finishing should be done after a period of dry, sunny weather when wood moisture content is uniformly low. Even though Exterior Fire-X is always kiln dried after treatment, additional drying time is necessary after installation because of possible re-wetting on the job or moisture gain due to high humidity.

Furthermore, even freshly kiln dried after treatment wood will not have uniformly low enough moisture content for painting or staining, and shop application of paint or stain to freshly un-bundled wood is not recommended.

If you desire to apply a paint, stain, clear water repellent or other finish to your treated timber, we recommend following the manufacturer’s instructions and label of the finishing product. Before you start, we recommend that you apply the finishing product to a small test area before finishing the entire project, to ensure that it provides the intended result.

Disposal Do not burn treated wood. All sawdust and construction debris should be cleaned up and disposed of after construction.Exterior Fire-X treated timbers, which are no longer usable, such as cut ends, broken boards, sawdust, or treated timber material taken out of service, may be disposed of in accordance with national and local regulations. Do not allow treated wood waste to be used for animal litter. For up to date information please contact the Technical Services Department.











IMPORTANT INFORMATIONOsmose Naturewood is the brand name for wood pressure treated with a copper and organic co-biocide based preservative system.• Wear a dust mask and goggles when cutting or sanding wood.• Wear gloves when working with wood.• Some preservative may migrate from the treated wood into soil/ water or may dislodge from the treated wood surface upon contact with skin. Wash exposed skin areas thoroughly.

• All sawdust and construction debris should be cleaned up and disposed of after construction.• Do not burn preserved wood.• Wash work clothes separately from other household clothing before re-use.• Preserved wood should not be used where it may come into direct contact or indirect

contact with drinking water, except for uses involving incidental contact such as fresh water docks and bridges.

• Do not use preserved wood under circumstances where the preservative may become a component of food, animal feed, or beehives.

• Do not use preserved wood for mulch.• Only preserved wood that is visibly clean and free of surface residue should be used.• Do not use preserved wood in direct contact with aluminium. • If wood is to be used in an interior application and becomes wet during construction, it

should be allowed to dry before being covered or enclosed.• Disposal Recommendations: Preserved wood may be disposed of in landfills or burned

in commercial or industrial incinerators or boilers in accordance with National and Regional regulations.

• If you desire to apply a paint, stain, clear water repellent or other finish to your preservative treated wood, we recommend following the manufacturers instructions and label of the finishing product. Before you start, we recommend you apply the finishing product to a small test area before finishing the entire project to ensure it provides the intended result before proceeding.

• Certain metal products (Inc fastener, hardware and flashing) may corrode when in direct contact with wood treated with copper based preservatives. To prevent premature corrosion and failure it is important to follow the recommendations of the manufacturer for all metal products.

• Mould growth can and does occur on the surface of many products, including treated or untreated wood, during prolonged surface exposure to excessive moisture conditions. To remove mould from treated wood surfaces, wood should be allowed to dry. Typically, mild soap and water can be used to remove surface mould.

MicroPro pressure treated wood has corrosion rates on metal products similar to CCA pressure treated wood and untreated wood. Use fasteners and hardware that are in compliance with the manufacturer’s recommendations and the building regulations for their intended use. When using aluminium products in conjunction with MicroPro treated wood, refer to the additional MicroPro Fastener information. For interior or exterior applications, use fasteners and hardware that are in compliance with the manufacturer’s

recommendations and the building regulations for their intended use. As with any good design and construction practices, MicroPro treated wood should not be used in applications where trapped moisture or water can occur. Where design and/or actual conditions allow for constant, repetitive or long periods of wet conditions, only stainless steel fasteners should be used.

• Do not burn preserved wood.• Wear a dust mask and goggles when cutting or sanding wood.• Wear gloves when working with wood.• Some preservative may migrate from the treated wood into soil/water or may dislodge from

the treated wood surface upon contact with skin. Wash exposed skin areas thoroughly.• All sawdust and construction debris should be cleaned up and disposed of after construction.• Wash work clothes separately from other household clothing before re-use.• Preserved wood should not be used where it may come into direct contact or indirect contact with

drinking water, except for uses involving incidental contact such as fresh water docks and bridges.• Do not use preserved wood under circumstances where the preservative may become a

component of food, animal feed, or beehives.• Do not use preserved wood for mulch.• Only preserved wood that is visibly clean and free of surface residue should be used.• If wood is to be used in an interior application and becomes wet during construction, it should

be allowed to dry before being covered or enclosed.• Disposal Recommendations: Preserved wood may be disposed of in landfills or burned in commercial

or industrial incinerators or boilers in accordance with National and Regional regulations.• If you desire to apply a paint, stain, clear water repellent or other finish to your preservative

treated wood, we recommend following the manufacturers instructions and label of the finishing product. Before you start, we recommend you apply the finishing product to a small test area before finishing the entire project to ensure it provides the intended result before proceeding.


For more information visit www.micronizedtimber.com

For important information on Osmose Royale, Osmose Indurite and Osmose FirePRO please contact us.

For further information visit www.osmose-europe.com

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Important Information• Wear a dust mask and goggles when cutting or sanding wood.

• Wear gloves when working with wood.

• All sawdust and construction debris should be cleaned up and disposed of after construction.

• Wash work clothes separately from other household clothing before re-use.

• Fire Retardant Treated Wood (FRTW) products should not be used where they may come into direct contact or indirect contact with

drinking water, except for uses involving incidental contact.

• Do not use FRTW products under circumstances where they may become a component of food, animal feed, or beehives.

• Do not use FRTW products for mulch.

• Only FRTW products that are visibly clean and free of surface residue should be used.

• If wood products are wet during construction, they should be replaced.

• Do not burn treated wood. See Disposal Recommendations.

• Disposal Recommendations: FRTW products which are no longer useable (e.g. cut ends, broken boards, timber taken out of service)

should not be burned. They may be disposed of in landfills, or burned in commercial or industrial incinerators or boilers, in accordance

with National and local regulations.

• It should be noted that the use of some paints may affect the fire properties of the end products and care must be taken to select an

appropriate paint. Always follow the coating manufacturer’s instructions.

• Use fixings and other hardware which are in compliance with building regulations for the intended use.

• Use fixings, hardware or any metal products as recommended by their manufacturer.

• Mould growth can and does occur on the surface of many products, including untreated and treated wood, during prolonged surface

exposure to excessive moisture conditions. To remove mould from the treated wood surface, wood should be allowed to dry. Typically,

mild soap and water can be used to remove remaining surface mould.

Important Information• Do not burn treated wood.

• Wear gloves when working with wood.

• Wear a dust mask and goggles when cutting or sanding wood.

• Some fire retardant may dislodge from the treated wood surface upon contact with skin. Wash exposed skin areas thoroughly.

• All sawdust and construction debris should be cleaned up and disposed of after construction.

• Wash work clothes separately from other household clothing before re-use.

• Fire retardant wood products should not be used where they may come into direct contact or indirect contact with drinking water.

• Do not use treated wood under circumstances where the flame retardant may become a component of food, animal feed or beehives.

• Do not use treated wood as mulch.

• Only fire retardant treated wood products that are visibly clean and free of surface residue should be used.

• If wood is to be used in an interior application and becomes wet during construction, it should be allowed to dry before being covered or

enclosed.

• Mould growth can and does occur on the surface of many products, including treated or untreated wood, during prolonged surface

exposure to excessive moisture conditions. To remove mould from treated wood surfaces, wood should be allowed to dry.

• Certain metal products (including fasteners, hardware and flashing) may corrode when in direct contact with wood exposed to water.

Use fixings, hardware or any metal products as recommended by their manufacturer. Stainless steel and hot dipped galvanised fixings

are recommended.

• If you desire to apply a paint, stain, clear water repellent or other finish to your treated timber, we recommend following the

manufacturer’s instructions and label of the finishing product. Before you start, we recommend that you apply the finishing product to a

small test area before finishing the entire project, to ensure that it provides the intended result.

• Exterior Fire-X treated timbers which are no longer usable, such as cut ends, broken boards, sawdust, or treated timber material taken

out of service, may be disposed of in accordance with national and local regulations.

*Osmose is a registered Trademark of Protim Solignum Limited. Osmose FirePRO* is a trademark of Protim Solignum Limited and a registered trademark of Osmose in the U.S.A. Exterior Fire-X* is a registered Trademark of Hoover Treated Wood Products Inc. Literature will be updated when the need arises. Please ensure you have an up to date copy. Whilst every attempt has been made to ensure the accuracy and reliability of the information contained in this leaflet Protim Solignum Limited gives no undertaking to that effect and no responsibility can be accepted for reliance on this information. Protim Solignum Limited trades as Osmose*. An Osmose* company. Osmose FirePRO* and Exterior Fire-X products are produced by independently owned and operated wood treating facilities. All other trademarks are trademarks of their respective owners.

All FRTW products are treated by independently owned facilities

The specifier and/or end user is responsible for reviewing the test data on Osmose FirePRO and Exterior Fire-X FRTW products to determine if they are acceptable for the intended end use.

Copyright April 2012


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WoodPreservative

Preservative Treatments

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High Pressure Treated Timber User Guide

Important information for users of Osmose Naturewood High-Pressure treated timber

What is Osmose Naturewood? Osmose Naturewood preserved wood is the name given to timber that has been preserved with an Osmose preservative system known as Celcure AC-500, which is based on copper and an organic co-biocide (Alkaline Copper Quaternary). Alkaline Copper Quaternary systems have provided proven performance for over a decade in locations throughout Europe, North America, Australia and Japan. Osmose Naturewood preserved wood can be used for fencing, timber decking, landscaping timbers and construction timbers. Osmose Naturewood® can be used to treat all timber in use classes 1-4. Information on the Use Class system is available from PTG Treatments or from BS EN 335-1. Osmose Naturewood® appears in the Wood Protection Association Manual as compliant with EN 599 expectations.

What length of service life can be expected? Service life of the treated timber depends upon the species, end use and application rates. In general it can be expected that internal timbers used in Use Class 1 or 2 will last in excess of 60 years. Those timber exposed to weathering but installed above ground contact will achieve service lives of between15-30 years. Timbers serving in-ground contact such as fence posts can achieve a service life of around 15 years. However care should be taken to chose the correct species for the end-use and to specify the correct level of treatment.

How do I specify treatment with Osmose Naturewood? 1) Firstly identify the component end use. 2) Identify the Use Class pertaining to this end use – e.g. fence post = Use Class 4. 3) Identify any special service life considerations – do they differ from those

described above? If so consult PTG Treatments for specialist advice. 4) Identify and report the species of the timber to be treated as this has a

considerable bearing on suitability for certain treatment process or end uses. Also identify and report the moisture content of the timber.

5) PTG Treatments recommends a form of words such as ‘Timber to be treated to a 15 year service life in Use Class 4 conditions. The species is pine and the moisture content is lower than 28%.’

6) Specify whether a Treatment Certificate is required.

USE CLASS TABLEUse Class (UC) Use

1 Above ground, covered. Permanently dry, insect risk.

2 Above ground, covered. Occasional risk of wetting.

3a Above ground, coated. Exposed to frequent wetting.

3b Above ground, uncoated. Exposed to frequent wetting.

4In contact with ground or fresh water. Permanently exposed to wetting.Treated Timber

for Ground Contact

Treated Timber for Ground Contact



Preparation of timber prior to treatment 1) Timber packs must be of the correct moisture content in order to allow sufficient penetration into the wood fibre.

Below 28% moisture content is the recommendation. 2) Timber must be debarked and, as far as possible, free from sawdust and debris. Plastic wrapping should be removed.

Packs that have been very tightly banded should have the bands cut prior to treatment to allow free passage of the fluid into the packs.

3) All possible working of the timber should be performed prior to treatment 4) If timber shows signs of incipient attack from fungus or insects it should not be treated. 5) A small amount of blue-stain is not critical. 6) Where possible, space the packs with laths in order to allow free passage of the fluid and to aid the drying

process afterwards.


2 3 4 5 61


A vacuum pulls the air out of the vessel.

Osmose Naturewood solution fills the vessel.

The vessel is pressurised forcing the solution into

the timber.

The solution is removed and final vacuum is

applied removing excess.











Collection of treated timber Treated timber should always be allowed to dry sufficiently before it is despatched. In general a period of not less than 24 hours should elapse. This is typically a minimum requirement and timber packs should be touch dry with no free fluid in the packs at all. It should be remembered that timber will also swell to some extent during treatment and should be allowed to dry at a natural rate until it has reached its pre-treatment moisture content.

Re-working of treated timber Occasionally it may be necessary to re-work treated timber. Every effort must be made to avoid this but if it must be done the following should be observed. 1) Any surface exposed by drilling or cutting must be coated with a cut end preservative. Failure to coat will affect the value

of the preservative. It is recommended that the coated ends are not put in the ground or in direct contact with water. Rip sawing, thicknessing and planing are not permitted unless the timber is subsequently processed to the original specification.

2) Never place a re-treated end in ground contact. 4) Where any working is carried out, read and follow the health and safety instructions in the Health and Safety section

of this guide.

GluingOsmose Naturewood preserved wood can be glued with most commonly used adhesives once dry. Always follow the adhesive manufacturer’s recommendations.

Which metal fixings can I use? Certain metal products (including fasteners, hardware and flashing) may corrode when in direct contact with wood treated with copper based preservatives. To prevent premature corrosion and failure it is important to follow the recommendations of the manufacturer for all metal products. Do not use preserved wood in direct contact with aluminium.

Appearance of Osmose NaturewoodOsmose Naturewood products will initially have a green appearance that highlights the natural variations of the wood; this will weather to an attractive natural honey brown colour before finally fading to a driftwood grey after long term exposure to the sun. Osmose Naturewood products can be stained to match any outdoor colour scheme. Always follow manufacturer’s recommendations.Osmose Naturewood®-treated timber is also available with a brown colour. As with the natural green colouration of treated timber, the brown colour will fade after a period of time. The rate of fading will depend on the end use application and environmental conditions.

Can I paint and stain this timber? Yes. Osmose Naturewood treated timber can be painted using most standard wood coating systems. It is important that the timber should be dried sufficiently following treatment. In general that means that timber should be less than 20% moisture content, at the time of painting. Both water-based and oil-based systems are compatible but advice should be sought from the coatings supplier before application.

CuttingPreserved wood should not be cut or otherwise reworked as this will expose unpreserved wood. If cutting cannot be avoided, then precautions should be taken to keep airborne dust levels below the Workplace Exposure Limits for wood dust. In particular, avoid inhalation of dust when using high speed cross-cut saws or mechanical sanders. Any surface exposed by drilling or cutting must be retreated with a cut end preservative. Failure to do this will reduce the effectiveness of the preservative. It is recommended that the re-preserved ends are not put in the ground or in direct contact with water. Rip sawing, thicknessing and planing are not permitted unless the timber is subsequently re-preserved to the original specification.

Please note: Preservative penetration depends upon species, end use classification and in some cases heartwood / sapwood ratios. Unseasoned timber – Whilst every effort is made to service treat any unseasoned timber (above 28% moisture content) to the correct specification. PTG Treatments cannot be held responsible for the actual net retention of preservative achieved through the treatment due to the high moisture content of the wood.

Treatment Code Use Class Examples of end use Treatment Centre

PT1 1/2 Internal construction, timber frame, roofing and tiling timbers

PT2 3 Fence rails, deck boards and garden timbers. Sole plates above the damp-proof course

PT3 1/2/3 Plywood

PT4 4 Fence posts and all timber in ground contact

PT5 N/A Australian Quarantine Regulations

PT6 3/4 Preservative protection with added brown colour











High Pressure Treated Timber Specification Guide

Important information for users of Osmose Naturewood High-Pressure treated timber

Desired service lives For timbers used in Use Class1and 2: up to 60 years For timbers used in Use Class 3: 15 to 30 years For timbers used in Use Class 4: up to 20 years

Low Pressure Treated Timber User Guide

Important information for users of Protim ClearchoiceLow Pressure treated timber

What is Protim Clearchoice? Protim Clearchoice is the brand name for wood pressure treated with an organic based preservative. Protim Clearchoice is a pressure applied preservative system for timber to be used in construction projects that will require protection to Use Class UC1, UC2 and/or UC3 (see table). Protim Clearchoice preserved wood has been preserved by the correct application of Protim E406 wood preservative, and then allowed to dry. Properly treated Protim Clearchoice preserved wood is protected against wood destroying insects and attack by wood decaying fungi.Protim Clearchoice preserved wood is suitable for roof timbers, timber framing, carcassing, and internal and external timber projects that are above damp-proof course/ ground level. For use out of ground contact or out of surface water contact. Timbers exposed to weathering should be given the additional protection of a well-maintained surface finish.

What length of service life can be expected? Service life of the treated timber depends upon the species, end use and application rates. In general it can be expected that internal timbers used in Use Class 1 or 2 will last in excess of 60 years. Those timber exposed to weathering but installed above ground contact will achieve service lives of between15-30 years. However care should be taken to chose the correct species for the end-use and to specify the correct level of treatment.

How do I specify treatment with Protim Clearchoice? 1) Firstly identify the component end use. 2) Identify the Use Class pertaining to this end use – e.g. timber framing = Use Class 2. 3) Identify any special service life considerations – do they differ from those

described above? If so consult PTG Treatments for specialist advice. 4) Identify and report the species of the timber to be treated as this has a

considerable bearing on suitability for certain treatment process or end uses. Also identify and report the moisture content of the timber.

5) PTG Treatments recommends a form of words such as ‘Timber to be treated to a 60 year service life in Use Class 2 conditions. The species is pine and the moisture content is lower than 28%.’

6) Specify whether a Treatment Certificate is required.

USE CLASS TABLEUse Class (UC) Use

1 Above ground, covered. Permanently dry, insect risk.

2 Above ground, covered. Occasional risk of wetting.

3a Above ground, coated. Exposed to frequent wetting.

3b Above ground, uncoated. Exposed to frequent wetting.

Preparation of timber prior to treatment 1) Timber packs must be of the correct moisture content in order to allow sufficient penetration into the wood fibre.

Below 28% moisture content is the recommendation. 2) Timber must be debarked and, as far as possible, free from sawdust and debris. Plastic wrapping should be removed.

Packs that have been very tightly banded should have the bands cut prior to treatment to allow free passage of the fluid into the packs.

3) All possible working of the timber should be performed prior to treatment 4) If timber shows signs of incipient attack from fungus or insects it should not be treated. 5) A small amount of blue-stain is not critical. 6) Where possible, space the packs with laths in order to allow free passage of the fluid and to aid the drying

process afterwards.


2 64 531


A vacuum pulls the air out of the vessel.

Protim Clearchoice solution fills the vessel.

The vessel is pressurised forcing the solution into

the timber.

The solution is removed and final vacuum is applied

removing excess.

The timber has now been treated with Protim

Clearchoice solution.











Collection of treated timber Treated timber should always be allowed to dry sufficiently before it is despatched. In general a period of not less than 24 hours should elapse. This is typically a minimum requirement and timber packs should be touch dry with no free fluid in the packs at all. It should be remembered that timber will also swell to some extent during treatment and should be allowed to dry at a natural rate until it has reached its pre-treatment moisture content.

Re-working of treated timber Occasionally it may be necessary to re-work treated timber. Every effort must be made to avoid this but if it must be done the following should be observed. 1) Any surface exposed by drilling or cutting must be coated with a cut end preservative. Failure to coat will affect the

value of the preservative. It is recommended that the coated ends are not put in the ground or in direct contact with water. Rip sawing, thicknessing and planing are not permitted unless the timber is subsequently processed to the original specification.

2) Never place a re-treated end in ground contact. 3) Where any working is carried out, read and follow the health and safety instructions in the Important Information

section of this guide.

GluingThe compatibility of glues and mastics should be checked before application. Always follow the product manufacturer’s recommendations.

Which metal fixings can I use? Certain metal products (including fasteners, hardware and flashing) may corrode when in direct contact with wood exposed to water. Use fixings and other hardware which are in compliance with building regulations for the intended use. Use fixings, hardware or any metal products as recommended by their manufacturer.

Appearance of Protim ClearchoiceProtim Clearchoice products are often clear in appearance giving the treated timber a natural look, however Colour tints may be added to treatment solutions during the manufacturing process to provide a ready means of identifying wood that has recently been treated.

These are dyes and will often fade after a period of time.

Can I paint and stain this timber? If you desire to apply a paint, stain, clear water repellent or other finish to your preservative treated wood, we recommend that you apply the finishing product to a small test area to ensure that it provides the intended result, before proceeding.

CuttingPreserved wood should not be cut or otherwise reworked as this will expose unpreserved wood. Any surface exposed by drilling or cutting must be re-treated with an approved (i.e. by the UK Health and Safety Executive) cut end preservative. Failure to re-treat may reduce the effectiveness of the preservative treatment. Rip-sawing, thicknessing and planing are not permitted unless the timber is subsequently re-preserved to the original specification.If cutting cannot be avoided, then precautions should be taken to keep airborne dust levels below the Workplace Exposure Limit for Wood Dust. In particular, avoid inhalation of dust when using high speed cross-cut saws or mechanical sanders.

Please note: Preservative penetration depends upon species, end use classification and in some cases heartwood / sapwood ratios. Unseasoned timber – Whilst every effort is made to service treat any unseasoned timber (above 28% moisture content) to the correct specification. PTG Treatments cannot be held responsible for the actual net retention of preservative achieved through the treatment due to the high moisture content of the wood.

Low Pressure Treated Timber Specification Guide

Important information for users of Osmose Protim Clearchoice Low Pressure treated timber

Desired service lives For timbers used in Use Class1and 2: up to 60 years For timbers used in Use Class 3: 15 to 30 years

Treatment Code Use Class Examples of end use Treatment Centre

PV1 1/2 Internal construction, timber frame, roofing and tiling timbers

PV2 1/2/3 Plywood

PV3 3 Joinery or timber used externally above ground and protected by a suitable and maintained surface coating













• Do not burn preserved wood.• Wear a dust mask and goggles when cutting or sanding wood.• Wear gloves when working with wood.• Some preservative may migrate from the treated wood into soil/water or may dislodge from the treated wood surface upon contact with skin. Wash exposed skin areas thoroughly.

• All sawdust and construction debris should be cleaned up and disposed of after construction.• Wash work clothes separately from other household clothing before re-use.• Preserved wood should not be used where it may come into direct contact or indirect contact with drinking water, except for uses involving incidental

contact such as fresh water docks and bridges.• Do not use preserved wood under circumstances where the preservative may become a component of food, animal feed, or beehives.• Do not use preserved wood for mulch.• Only preserved wood that is visibly clean and free of surface residue should be used.• Do not use preserved wood in direct contact with aluminium. • If wood is to be used in an interior application and becomes wet during construction, it should be allowed to dry before being covered or enclosed.• Disposal Recommendations: Preserved wood may be disposed of in landfills or burned in commercial or industrial incinerators or boilers in

accordance with National and Regional regulations.• If you desire to apply a paint, stain, clear water repellent or other finish to your preservative treated wood, we recommend following the manufacturers

instructions and label of the finishing product. Before you start, we recommend you apply the finishing product to a small test area before finishing the entire project to ensure it provides the intended result before proceeding.




• Wear a dust mask and goggles when cutting or sanding wood.• Wear gloves when working with wood.• Wash work clothes separately from other household clothing before re-use.• All sawdust and construction debris should be cleaned up and disposed of after construction.• Do not burn preserved wood.

• Do not use preserved wood for mulch.• Only preserved wood that is visibly clean and free of surface residue should be used.• Do not use preserved wood under circumstances where the preservative may become a component of food, animal feed, or beehives.• Preserved wood should not be used where it may come into direct contact or indirect contact with drinking water.• Use fixings, hardware or any metal products as recommended by their manufacturer. • If wood is to be used in an interior application and becomes wet during construction, it should be allowed to dry before being covered or enclosed.• Some preservative may migrate from the wood into soil/water or may dislodge from the preserved wood surface upon contact with skin. Wash exposed

skin areas thoroughly. • Mould growth can and does occur on the surface of many products, including treated or untreated wood, during prolonged surface exposure to excessive moisture

conditions. To remove mould from treated wood surfaces, wood should be allowed to dry. Typically, mild soap and water can be used to remove surface mould.• Disposal Recommendations: Preserved wood may be disposed of in landfills or burned in commercial or industrial incinerators or boilers in accordance

with National and Regional regulations.• Protim preserved wood is compatible with most coatings, glues and sealants and can normally be coated with most wood finishes 48 hrs after treatment.

Before you start, we recommend you apply the finishing product to a small test area before finishing the entire project to ensure it provides the intended result before proceeding. Protim preserved wood may be glued with resorcinol, phenol/resorcinol or urea formaldehyde glues. Protim preserved wood is compatible with most sealants and mastics, always follow manufacturer’s recommendations.


Fire Retardant Treated Wood Products• Wear a dust mask and goggles when cutting or sanding wood.• Wear gloves when working with wood.• All sawdust and construction debris should be cleaned up and disposed of after construction.• Wash work clothes separately from other household clothing before re-use.

• FRTW products should not be used where they may come into direct contact or indirect contact with drinking water, except for uses involving incidental contact.• Do not use FRTW products under circumstances where they may become a component of food, animal feed, or beehives.• Do not use FRTW products for mulch.• Only FRTW products that are visibly clean and free of surface residue should be used.• If wood products are wet during construction, they should be replaced.• Do not burn treated wood. See Disposal Recommendations.• Disposal Recommendations: FRTW products which are no longer useable (e.g. cut ends, broken boards, timber taken out of service) should not be burned.

They may be disposed of in landfills, or burned in commercial or industrial incinerators or boilers, in accordance with National and local regulations.• It should be noted that the use of some paints may affect the fire properties of the end products and care must be taken to select an appropriate paint.

Always follow the coating manufacturer’s instructions.• Use fixings and other hardware which are in compliance with building regulations for the intended use.• Use fixings, hardware or any metal products as recommended by their manufacturer.• Mould growth can and does occur on the surface of many products, including untreated and treated wood, during prolonged surface exposure to

excessive moisture conditions. To remove mould from the treated wood surface, wood should be allowed to dry. Typically, mild soap and water can be used to remove remaining surface mould.

For more information visit www.osmose-europe.com or click the link

Timber Technologies

IMPORTANT INFORMATIONOsmose Naturewood is the brand name for wood pressure treated with a copper and organic co-biocide based preservative system.• Wear a dust mask and goggles when cutting or sanding wood.• Wear gloves when working with wood.• Some preservative may migrate from the treated wood into soil/ water or may dislodge from the treated wood surface upon contact with skin. Wash exposed skin areas thoroughly.

• All sawdust and construction debris should be cleaned up and disposed of after construction.• Do not burn preserved wood.• Wash work clothes separately from other household clothing before re-use.• Preserved wood should not be used where it may come into direct contact or indirect

contact with drinking water, except for uses involving incidental contact such as fresh water docks and bridges.

• Do not use preserved wood under circumstances where the preservative may become a component of food, animal feed, or beehives.

• Do not use preserved wood for mulch.• Only preserved wood that is visibly clean and free of surface residue should be used.• Do not use preserved wood in direct contact with aluminium. • If wood is to be used in an interior application and becomes wet during construction, it

should be allowed to dry before being covered or enclosed.• Disposal Recommendations: Preserved wood may be disposed of in landfills or burned

in commercial or industrial incinerators or boilers in accordance with National and Regional regulations.

• If you desire to apply a paint, stain, clear water repellent or other finish to your preservative treated wood, we recommend following the manufacturers instructions and label of the finishing product. Before you start, we recommend you apply the finishing product to a small test area before finishing the entire project to ensure it provides the intended result before proceeding.



MicroPro pressure treated wood has corrosion rates on metal products similar to CCA pressure treated wood and untreated wood. Use fasteners and hardware that are in compliance with the manufacturer’s recommendations and the building regulations for their intended use. When using aluminium products in conjunction with MicroPro treated wood, refer to the additional MicroPro Fastener information. For interior or exterior applications, use fasteners and hardware that are in compliance with the manufacturer’s

recommendations and the building regulations for their intended use. As with any good design and construction practices, MicroPro treated wood should not be used in applications where trapped moisture or water can occur. Where design and/or actual conditions allow for constant, repetitive or long periods of wet conditions, only stainless steel fasteners should be used.

• Do not burn preserved wood.• Wear a dust mask and goggles when cutting or sanding wood.• Wear gloves when working with wood.• Some preservative may migrate from the treated wood into soil/water or may dislodge from

the treated wood surface upon contact with skin. Wash exposed skin areas thoroughly.• All sawdust and construction debris should be cleaned up and disposed of after construction.• Wash work clothes separately from other household clothing before re-use.• Preserved wood should not be used where it may come into direct contact or indirect contact with

drinking water, except for uses involving incidental contact such as fresh water docks and bridges.• Do not use preserved wood under circumstances where the preservative may become a

component of food, animal feed, or beehives.• Do not use preserved wood for mulch.• Only preserved wood that is visibly clean and free of surface residue should be used.• If wood is to be used in an interior application and becomes wet during construction, it should

be allowed to dry before being covered or enclosed.• Disposal Recommendations: Preserved wood may be disposed of in landfills or burned in commercial

or industrial incinerators or boilers in accordance with National and Regional regulations.• If you desire to apply a paint, stain, clear water repellent or other finish to your preservative

treated wood, we recommend following the manufacturers instructions and label of the finishing product. Before you start, we recommend you apply the finishing product to a small test area before finishing the entire project to ensure it provides the intended result before proceeding.


For more information visit www.micronizedtimber.com

For important information on Osmose Royale, Osmose Indurite and Osmose FirePRO please contact us.

For further information visit www.osmose-europe.com

Untitled-1 1 09/11/2010 11:07:16

*Osmose *Protim *Osmose Naturewood are registered Trademarks of Protim Solignum Limited. Literature will be updated when the need arises. Please ensure you have an up to date copy. Whilst every attempt has been made to ensure the accuracy and reliability of the information contained in this leaflet Protim Solignum Limited gives no undertaking to that effect and no responsibility can be accepted for reliance on this information. Protim Solignum Limited trades as Osmose*. An Osmose* company. All products are produced by independently owned and operated wood treating facilities. All other trademarks are trademarks of their respective owners.

The specifier and/or end user is responsible for reviewing the test data on Osmose Naturewood and Osmose Protim products to determine if they are acceptable for the intended end use.

Copyright April 2012


Documents

A Guide to Pressure Treated Timber - L&G Forest Products