Specification of Workmanship and Materials...1 Specification of Workmanship and Materials Flat Roof Renewal & External Maintenance to: Wimbledon Hall Derby Road, Bournemouth, BH1 3PP

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Specification of Workmanship and

Materials

Flat Roof Renewal & External Maintenance to:

Wimbledon Hall

Derby Road,

Bournemouth,

BH1 3PP

Aster Group Limited 2017

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Location

Wimbledon Hall, Derby Road, Bournemouth BH1 3PP NB: The flat blocks should be considered tenanted throughout the course of the works.

Scope of Works – Phase 1

1. Scaffolding

The Principle Contractor will arrange for designed scaffolding with suitable netting attached when and where necessary, this must enable safe, secure and unhindered access to all floor levels, making the site ready to deliver all identified works to both of the flat blocks. To successfully achieve the scope of works, each of the sub-contractors will need to be consulted on their individual requirements. The scaffold shall be designed to suit each programmed work phase, it should only necessitate adjustment once all phases dependent on its lift configuration have been successfully completed, and fully inspected to Aster’s satisfaction. To ensure safe load transfer down from the proposed rear elevation scaffolding, and to reduce the stress onto the rear communal car park flat roofs, the scaffold design will need to incorporate internal propped support to the underside of these roofs. Care must be taken to prevent the smoke vent windows, boiler flues and service vents from being impeded in any way by scaffolding; this will ensure that they operate in the event of an emergency. Once the scaffold has been erected it must be signed off with all necessary certification and regularly inspected using the scaff-tag system. NB: The scaffolding for both blocks will be priced on a fixed fee basis for the duration of the contract.

Skips & waste management Provide skips for the removal of rubbish as necessary including all safety lighting and warning cones.

Allow for waste chutes to be attached to the scaffold, ensure that they are positioned so that they discharge safely into the skips enabling the removal of any unlicensed redundant materials and brick rubble efficiently.

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2. Communal Digital TV/Satellite system The Principle Contractor will arrange for a specialist to undertake the following system upgrade: Supply and install an upgraded optical fibre Digital TV and Satellite system, which will need to independently serve both flat blocks. Prior to the roofing contractor undertaking a complete refurbishment of the main roofs, initial preparation will involve the removal and disposal of all the existing surface Digital TV/Satellite cabling and associated redundant services. At present this cabling is wrapped around roof vents and trailing across the main roofs on both of the blocks. The new infrastructure must be fixed in advance of the old being decommissioned to ensure that a temporary service is kept functional during the course of the project. Both residents and leaseholders will need to be consulted regarding the position of new installation socket and the removal of redundant digital TV/Satellite socket/s. The final testing and commissioning of the new digital TV/Satellite system will follow upon the completion of all roofing and external work.

Digital TV & Satellite upgrade to both blocks. Replace the existing system with a separate fibre system per building. NB: There is no signal loss through fibre cable and the increased cost of copper now makes this a viable and flexible system to upgrade to. 1 No. communal power source will be required per block which will be taken from the existing socket in lift room. The new design will ensure that there are no cables on the main flat roof at all. The price should allow for all necessary temporary work required to remove the existing cables from the flat roof during the first phase of works. The system will be compatible with existing Sky, Sky Plus, Sky Q, Freesat, Freesat PVR and Freeview systems. The fibre cables will be fitted in“Kopex” type containment around the top perimeter of the brickwork allowing future access from the flat roof. The boxes that will contain the cables to the flats will be situated around 3 meters above floor level so as to maintain future access without the need for scaffold. However internal access will be required to every flat to enable termination of the fibre and fitting of the internal plate.

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Twin fibre cable will need to be fitted into each flat to provide some future redundancy and any future developments. NB: The only drawback at present due to high cost is the inability to add any foreign satellite capability alongside the Astra (Sky) sat used at present for Sky. Equipment & materials as follows: 2 x TRI DAP 70cm fibre glass dish 2 x UHF aerial array 2 x V51 – 204 4 in amplifier 2 x Aerial / sat fibre ODU32 kit 2 x GI HF 5m N connectors 4 x 2 Way optical splitters 8 x 16 Way optical splitters 8 x 1m Pre T patch cord 200 x 500m FCPC digital / fusion splice 2500m twin fibre cable 10 x Steel breakout splice box 70 x DSCR GTU’s 70 x 45mm Pattresses 70 x TV / FM / Sat / Sat 2 plates 200 F Compression connectors Fibre cable

3. Roofing refurbishment works – Danosa warm & cold roofs The initial phase of the project will involve preparing and priming the existing roof system, this will then form a suitable vapour control layer ready for additional insulation to cover the main concrete constructed flat roofs making up Wimbledon Hall’s two blocks numbered 1 – 35 & 36 – 70. The main roof decks will need to be re-engineered to form a full perimeter parapet complete with 50mm water check, new insulation will be added to improve the thermal performance and the drainage falls will need adjustment in preparation to receive a Danosa reinforced bitumen membrane upgrade. Upper and lower level roofing work will include replacing the flat roofs covering the lift motor rooms, lower level front entrance porches, and recessed areas under the smoke release windows, both front and rear car park roofs and the communal bin store. All new “Code 4” lead cover flashings shall be cut and dressed neatly and accurately. To provide fully waterproof coverings/flashings shall be free from ripples, kinks, buckling and cracks. Ensure that finished lead-work is fully supported, adequately fixed to resist wind uplift and accommodate thermal movement without distortion and stress. An application of patination oil shall be applied to all visible lead-work upon finishing. The communal bin store will require a new white uPVC fascia, guttering and downpipe with rainwater shoe, including fixtures to match existing.

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The garage roofs will require light coloured pea gravel or crushed rock protection layer, not less than 10mm normal size graded, as single sized aggregate for felt roofing; for approval by Aster

J41 REINFORCED BITUMEN MEMBRANE ROOF COVERINGS

110 WARM DECK ROOF COVERINGS TO MAIN FLAT ROOFS TO BOTH BLOCKS.

Substrate: Existing bituminous waterproofing on a concrete deck.

Fall Design: 1:80 (0.7° / 1.25%) finished fall required in accordance with BS6229. It

is recommended that falls are designed at 1:60 (1.0° / 1.70%) to allow for deflection

and construction tolerances. In the absence of detailed calculations twice the

minimum fall should be designed (1:40 / 1.4° / 2.50%).

Preparation: Make Good Existing Roof System, Bitumen Primer+ (as clause 320B).

Refurbishment: Before laying the new waterproofing system, ensure that the

condition of the existing roof is suitable to receive the proposed roof system. The

moisture content and stability of existing materials should be checked prior to

installation as it may impair the integrity of the roof.

Roof Covering System

Vapour Control Layer: Not Required.

Note: The existing sealed roof system will serve as the vapour control layer. (If

required, make good to ensure continuous seal).

Insulation: Tissue PIR (as clause 420B).

Method of Attachment: Adhered (as clause 681).

U-Value: 0.18 w/m2K

Underlay and Ventilation Membrane: Esterdan 30 P Semiadhesivo (as clause 406)

Method of Attachment: Thermo-Adhesive (as clause 720)

Mineral Cap Sheet Membrane: Polydan 180-60/GP Elast+ (as clause 410C).

Colour: Black, Grey (Natural)

Accessories: As clause 150, plus:

Fasteners: DANOSA UK Fasteners - Carbon Steel / Stainless Steel

Detailing (Generally):

Underlay Membrane: Esterdan 30 P Autoadhesivo (as clause 405D).


130 COLD DECK ROOF COVERINGS TO LIFT MOTOR ROOMS, FRONT ENTERANCE

PORCHES, RECESSED AREA UNDER THE SMOKE RELEASE WINDOWS, GARAGE

FLAT ROOFS & THE COMMUNAL BIN STORE.

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Substrate: Existing bituminous waterproofing on a concrete deck.

Fall Design: 1:80 (0.7° / 1.25%) finished fall required in accordance with BS6229. It

is recommended that falls are designed at 1:60 (1.0° / 1.70%) to allow for deflection

and construction tolerances. In the absence of detailed calculations twice the

minimum fall should be designed (1:40 / 1.4° / 2.50%).

Preparation: Make Good Existing Roof System, Bitumen Primer+ (as clause 320B).

Refurbishment: Before laying the new waterproofing system, ensure that the

condition of the existing roof is suitable to receive the proposed roof system, as

specified and required by the manufacturer. The moisture content and stability of

existing materials should be checked prior to installation as it may impair the

integrity of the roof.

Roof Covering System

Underlay and Ventilation Membrane: Esterdan 30 P Semiadhesivo (as clause 406).

Method of Attachment: Thermo-Adhered (as clause 720)


Colour: Black, Grey (Natural)

Accessories: As clause 150, plus:

Fasteners: DANOSA UK Fasteners - Carbon Steel / Stainless Steel

Detailing (Generally):

Underlay Membrane: Esterdan 30 P Autoadhesivo (as clause 405D)


150 ROOF COVERING ACCESSORY PRODUCTS

Accessories:

Accessories: GRP Termination Bar, Aluminium Termination Bar

Trims: Drip Card, GRP Drip Trims, Aluminium Drip Trims

Sealants: Danoseal (plus Danoprime+ where required)

Liquid Detailing: Danoflex / Danoflex+ PU Detail (and Danoflex PU, Metal or Glass

Primer where required)

Lightning Protection (if required): SBS Lightning Cable Clip (as clause 482)

Rainwater Goods (if required):

Stainless Steel Rainwater Outlets (Overflow, Vertical, Parapet) (see appendix A),

Rainwater Outlet Insulation Tubes (if required) Custom PVC Fabrications, Leaf

Guards; as per design requirements and flow rate calculations.

Cable / Service Penetrations (if required): Rooftop Service Solutions (see appendix

B)

210 ROOF PERFORMANCE

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Roof Covering: Secure, free draining and weather-tight.

220 AVOIDANCE OF INTERSTITIAL CONDENSATION: WARM AND INVERTED ROOFS

Determine: Interstitial condensation risk of roof construction as recommended in

BS 6229.

Basic Design Data:

Outdoor Notional Psychrometric Conditions, Winter:

Temperature: -5°C

Relative Humidity: 90%

Vapour Pressure: 0.36 kPa

Duration: 60 days

Outdoor Notional Psychrometric Conditions, Summer:

Temperature: 18°C

Relative Humidity: 65%

Vapour Pressure: 1.34 kPa

Duration: 60 days

Temp (°C) Rh (%) Vp (kPa) Duration

Winter -5 90 0.36 60 Days

Summer 18 65 1.34 60 Days

The above data is based on BS 6229, table A.1.

Indoor Notional Psychrometric Condition:

Temperature: To be confirmed by the specifier, or based on the data in BS 6229,

table A.2.

Relative Humidity: To be confirmed by the specifier, or based on the data in BS

6229, table A.2.

Vapour Pressure: To be confirmed by the specifier, or based on the data in BS

6229, table A.2.

Temp (°C) Rh (%) Vp (kPa)

Houses and Flats 20 55 1.28

Offices 20 40 0.93

Schools 20 50 1.17

Factories 15 35 0.60

Heated Warehouses 15 35 0.60

Swimming Pools (Ventilated) 30 60 2.54

The above data is based on BS 6229, table A.2.

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Winter Interstitial Condensate (Warm Roof):

Calculated amount (maximum): 0.35 kg/m2

Calculated annual net retention: Nil.

Vapour Control / Barrier Layer: If necessary, provide a suitable membrane or

sealed deck so that damage and nuisance from interstitial condensation does not

occur.

Note: We have recommended the vapour control / barrier layer based on the below

humidity class classification which remains subject to approval:

Relative Humidity at Internal Temperature

Humidity Class Building Type 15 °C 20 °C 25 °C

1 Storage Areas < 50 < 35 < 25

2 Offices, Shops 50 – 65 35 – 50 25 – 35

3 Dwellings with Low Occupancy 65 – 80 50 – 60 35 – 45

4 Dwellings with High Occupancy 80 – 95 60 – 70 45 – 55

Sports Halls, Kitchens, Canteens, and Buildings Heated with Unflued Gas Heaters.

5 Special Buildings > 95 > 70 > 55

e.g. Laundry, Brewery, Swimming Pool

The above data is based on BS 5250, table B.5.

230 INSULATION

Requirement: Thermaroof TR27 LPC/FM

Supply and install Thermaroof TR27 LPC/FM high performance, fibre free, rigid thermoset

insulation, core faced on both sides with a coated glass tissue facing suitablr for insulating

flat roofs. Fully compatible with single–ply non–bituminous membranes that are fully

bonded with solvent based adhesive systems, most bitumen based and mastic asphalt

waterproofing systems and most green roof systems

Finished Surface: Suitably even, stable and robust to receive roof covering.

Insulation compliance: DANOSA UK approved, to a relevant British Standard, or

Agrément certified.

PRODUCTS

320B PRIMER Product Name: Bitumen Primer+ Description: Fast-drying one component

bituminous primer for torch-applied and self-adhered membranes. Colour: Black |

Installation: Roller-Applied as clause 530. See product ‘Technical Datasheet’ for full

performance specification, standards and definitions.

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330 TIMBER TRIMS, SUBSTRATES, ETC Quality: Planed. Free from wane, pitch pockets,

decay and insect attack except ambrosia beetle damage. Moisture content at time of

covering (maximum): 22%

345A PRE-FABRICATED GRP PERIMETER TRIMS Product Name: GRP Trims

Description: Drip edge and termination profiles. Colour: Black, White or Grey. Corners:

Internal (90°), External (270°) Installation: Mechanically fastened as clause 760. See

product ‘Technical Datasheet’ for full performance specification, standards and definitions.

345B PRE-FABRICATED ALUMINIUM PERIMETER TRIMS Product Name: Aluminium

Trims Description: Drip edge and termination profiles. Colour: Black, White, Grey or PPC

to custom RAL. Corners: Internal (90°), External (270°) Installation: Mechanically fastened

as clause 760. See product ‘Technical Datasheet’ for full performance specification,

standards and definitions.

355 MECHANICAL FASTENERS, WASHERS, PRESSURE PLATES, ETC Carbon Steel

Mechanical Fasteners: BS 5.8, TS 5.2, HD 6.1, BN 5.6, TS-PA Stainless Steel Mechanical

Fasteners: BS-A4 4.8, BN-RF 5.7 Thermally Broken Tube Washers: R45, R75, CT |

Pressure Plates: SP-40-F1, SP-8240-S3, SP-SS-40-F1, SP-70-D4, SP-SS-70-D4

Additional Items: GPR Peel Rivets, Nail Plugs Note: Only DANOSA UK fasteners may be

used for the attachment of the waterproofing and associated accessories. See product

‘Technical Datasheet’ for full performance specification, standards and definitions.

405D UNDERLAY MEMBRANE Product Name: Esterdan 30 P Autoadhesivo Description:

Bituminous waterproofing sheet with a non-self-protected surface of 3.00 kg/m2.

Composed of a non-woven polyester felt reinforcement and covered on both sides with a

high quality polymer modified elastomeric (SBS) bitumen and polyethylene film on the

upper surface and a siliconated polypropylene on the underside. See product ‘Technical

Datasheet’ for full performance specification, standards and definitions.

406 UNDERLAY & VENTILATION MEMBRANE Product Name: Esterdan 30 P

Semiadhesivo Description: Bituminous waterproofing sheet with a non-self-protected

surface of 3.00 kg/m2. Composed of a non-woven polyester felt reinforcement and

covered on both sides with a high quality polymer modified elastomeric (SBS) bitumen and

polyethylene film on the upper surface and a siliconated polypropylene on the underside.

See product ‘Technical Datasheet’ for full performance specification, standards and

definitions.

410C MINERAL CAP SHEET MEMBRANE Product Name: Polydan 180-60/GP Elast+

Material: Bituminous waterproofing sheet with self-protected surface of 5.60 kg/m2.

Composed of a non-woven polyester reinforcement and covered on both sides with a high

quality polymer modified elastomeric (SBS) bitumen. On the upper side of the sheet

mineral protection is used as protective material, the underside is a polyester film. Mineral

Colour: Black See product ‘Technical Datasheet’ for full performance specification,

standards and definitions.

420B WARM DECK ROOF INSULATION Product Reference: Tissue PIR

Description: High performance polyisocyanurate insulation with a mineral coated glass

tissue facing on both sides. Consult product ‘Technical Datasheet’ for dead/live load and

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compressive creep advice. Thickness: As determined by project u-value calculation. Note:

This product is suitable for limited maintenance foot traffic. See product ‘Technical

Datasheet’ for full performance specification, standards and definitions. DANOSA UK

approves market-leading insulation products which meet the minimum performance

standards defined on our ‘Technical Datasheets’. When purchased through DANOSA UK,

these products form part of a system package and are included in your DANOSA UK

warranty cover. Products which have not been specifically approved by DANOSA UK,

whether supplied by DANOSA UK or not, should be considered incompatible.

482 LIGHTNING PROTECTION SYSTEM CLIPS (if applicable) Product Name: SBS

Lightning Cable Clip Description: Lightning conductor clip designed to accommodate

lightning conductor strips including DANOSA SBS membrane flange. Size: To suit cables

maximum 25mm x 5mm. Installation: As clause 787. Note: Self-adhesive or non-DANOSA

membrane flange-types should be considered incompatible. See product ‘Technical

Datasheet’ for full performance specification, standards and definitions.

483 NON-STANDARD ACCESSORIES Note: The advice of the DANOSA UK technical

department should be sought to confirm the suitability and long term compatibility of any

roof accessory not supplied by (or otherwise approved by) DANOSA UK which will be

attached to or form part of the waterproofing system.

485 WALKWAYS Product Name: Esterdan Plus 50/GP Elast Description: Bituminous

waterproofing sheet with self-protected surface of 5.0 kg/m2. Composed of a polyester felt

reinforcement and covered on both sides with SBS modified bitumen mastic. On the upper

side of the sheet mineral protection is used as protective material, the underside is a

polyethylene film. Width: 1000mm | Thickness: 4.3mm | Finish: Mineral Chippings | Colour:

Red Installation: Torch-Applied as clause 860. See product ‘Technical Datasheet’ for full

performance specification, standards and definitions.

EXECUTION GENERALLY

500 INSTALLATION GENERALLY Trained Operatives: A minimum of 50% DANOSA UK

registered installers are required on each DANOSA UK installation. Trained operatives are

defined as those which have received a unique installer ID card and number from

DANOSA UK. The card must be valid and allocated to the installers physically working on

the project.

NB: The Principle Contractor will need to keep a daily site record of all Danosa trained site

operatives and their individual card ID to ensure compliance with a registered installation.

510 ADVERSE WEATHER General: Do not lay membrane at temperatures below 5°C or

in wet or damp conditions unless effective temporary cover is provided over the working

area. Unfinished Areas of Roof: Keep dry and protect edges of laid membrane from wind

uplift. Note: Temporary ballast may be required to incomplete areas to protect

incomplete/unrestrained areas from wind uplift.

520 INCOMPLETE WORK End of Working Day: Provide temporary seal to prevent water

infiltration. On Resumption of Work: Cut away tail of membrane from completed area and

remove from roof.

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530 APPLYING PRIMERS Surface Coverage: Apply continuous even coverage of primer

to surface in accordance with DANOSA UK instructions. Avoid and remove any heavy

pooling. Coats: One, even and full.

555 QUALITY CONTROL / RANDOM TESTING DANOSA UK will at random ask

operatives to remove samples of completed waterproofing as part of our quality control

procedures. The affected area will receive fresh replacement material and the results

recorded in the DANOSA UK ‘Project Inspection Report’.

560 PROTECTION & STORAGE OF MATERIALS Storage: Clean, dry and well ventilated

conditions.

570 TEMPORARY PROTECTION OF ROOF SYSTEM No building work should be carried

out from a completed roof. If following trades are to use the finished roof as a working

platform or access walkway, the responsibility for defining the scope of full temporary

protection must be agreed between relevant parties during the course of building

operations. Paint, plaster and solvents should not come into direct contact with the

completed roof surfacing so adequate protection should be adopted.

580 REPAIRS DURING / AFTER CONSTRUCTION Brush area clean of debris or prime

with bitumen primer. Fresh underlay and mineral cap sheet membrane should extend a

minimum of 100mm past the damage / penetration and accommodate a full 100mm bond.

Adhesion should be ‘black on black’. DANOSA UK recommends full roll width repairs for

the best aesthetics.

SUBSTRATES / VAPOUR CONTROL LAYERS / WARM DECK ROOF INSULATION

610 SUITABILITY OF SUBSTRATES Surfaces to be Covered: Secure, clean, dry, smooth,

free from frost, contaminants, voids and protrusions. Preliminary Work: Complete,

including (where applicable): - Grading to correct falls. - Formation of upstands, kerbs, box

gutters, sumps, grooves, chases and expansion joints. - Fastener of battens. Moisture

Content and Stability of Substrate: Must not impair integrity of roof. Suitability to be

confirmed by contractor.

620 RENEWING EXISTING COVERINGS Areas to be Renewed: To main flat roof to both

blocks, garage flat roofs & front entrance porch. Substrate: Do not damage. Timing:

Remove only sufficient coverings as will be renewed and made weather-tight on the same

day.

640 INSTALLING TIMBER TRIMS Fasteners: As fastener manufacturer’s

recommendations. Fastener Centres (maximum): Typically, 600mm. To be

determined/confirmed by the specifier to resist peak wind uplift. Fastener Heads: Flush

with, or below surface.

681 INSTALLING ADHERED WARM DECK INSULATION Setting Out: Long Edges: Fully

supported. Running at right angles to the edge of the roof (or to trough openings on metal

decks. Alternatively running diagonally across the roof (or across the corrugation line). End

Edges: Adequately supported. End Joints: Staggered. Attachment: Adhesive bonding

using Thermobond Adhesive. Adhesive Application: 20-40mm beads at 2-300mm centres.

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Completion: Boards must be in good condition, well-fitting and secure. There should be no

gaps between boards or at abutments.

WATERPROOF MEMBRANES / ACCESSORIES

720 INSTALLING THERMO-ADHERED UNDERLAY MEMBRANE Laying: If applicable,

unroll loose and cut to size. Do not wrinkle or stretch. Setting Out: Where falls apply, unroll

up the slope and install so that water drains over and not into membrane overlaps. All

cross joints should be staggered. In addition, setting out should be planned taking into

consideration the following: - Point of access. - Temporary drainage. - Formation of

effective day / night joints. - Sequencing of other trades. - Minimising waste. Ensure that

the sequence of laying enables temporary sealing of loose membrane edges to be down

the slope and not against the flow of water. Installation: Peel back protective release film

and apply adhesive face onto prepared and primed surface. Bond full over whole surface

ensuring no air pockets. Membrane to be fully bonded in the approved manner and should

be brushed / rolled onto the substrate. Torch-application of subsequent layer will activate

full thermo-adhesive bond to substrate. Sheet Overlaps: Minimum 80mm side laps.

Minimum 100mm head laps. All overlaps should be rolled with an appropriate lap roller.

Surface Condition at Completion: Fully sealed, smooth, weatherproof and free draining.

740 INSTALLING TORCH-APPLIED MINERAL CAP SHEET Laying: If applicable, unroll

loose and cut to size. Do not wrinkle or stretch. Setting Out: Where falls apply, unroll up

the slope and install so that water drains over and not into membrane overlaps. Mineral

cap sheet layer should be laid along same direction as the underlay membrane but in a

staggered position and all cross joints should also be staggered. In addition, setting out

should be planned taking into consideration the following: - Point of access. - Temporary

drainage. - Formation of effective day / night joints. - Sequencing of other trades. -

Minimising waste. Ensure that the sequence of laying enables temporary sealing of loose

membrane edges to be down the slope and not against the flow of water. Installation: Full

torch-bond over whole surface ensuring no air pockets. We recommend that roll bars are

used for the installation to ensure an even application. Membrane to be fully bonded in the

approved manner, confirmed by the presence of a slight bitumen bead at all overlaps. A 5-

10mm bitumen bleed is fully supported by DANOSA UK Technical Department. At head

laps, lightly torch and if necessary remove granules of lower membrane, to ensure ‘black

on black’ adhesion. Sheet Overlaps: Minimum 80mm side laps. Minimum 100mm head

laps. Surface Condition at Completion: Neat with carefully formed junctions. Fully sealed,

smooth, weatherproof and free draining.

760 DETAILING GENERALLY General: Detailing should be in accordance with DANOSA

UK published instructions. Upstands should conform to the requirements of BS 6229.

Fasteners: DANOSA UK fasteners as recommended by DANOSA UK. Mechanical

Fastener Frequency: Maximum 200mm centres as per DANOSA UK instructions.

(alternative) Nailing Frequency: Maximum 150mm centres in 2nr parallel alternating

staggered lines.

787 INSTALLING LIGHTNING PROTECTION CLIPS (if applicable) Locations: As drawing,

or at maximum 1000mm centres. Preparation: Brush area clean of debris and where

required, prime with Bitumen Primer or Bitumen Primer+. Attachment / Sealing: Fully

bonded flange to mineral cap sheet membrane.

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COMPLETION

905 PROJECT REGISTRATION - The Principle Contractor with register with DANOSA UK

before the project is started, or with first project purchase order. This process allocates the

project to a member of DANOSA UK’s technical team for monitoring and registers the

warranty documentation.

910 INSPECTION Interim and final roof inspections for all roof areas over 100m2 should

be undertaken by DANOSA UK: submit ‘Project Inspection Reports’. Roof areas under

100m2 may be self-certified by registered DANOSA UK installers and must be requested

at the time of project registration.

920 ROOF INTEGRITY TEST Requirement: For all DANOSA UK installations in which a

waterproofing membrane / system will be subsequently be covered (e.g. Green Roof,

Ballasted Roof, Terrace, etc) or at the request of the DANOSA UK’s technical team,

detailed in inspection reports. Testing Authority: The Testing Authority should submit a job

specific method statement prior to commencement which should be appropriate for the

application and weather conditions. Timing of Test: Prior to applying surfacing / finishes to

the roof membrane. Prior to handover. Condition of Roof Covering Prior to Testing:

Complete to stage where integrity can be tested. Surface: Clean and free of site debris.

Breaches Detected: Clean and dry surface to receive fresh membrane as clause 580. Test

Results: Submit on completion of commissioning tests.

Flood testing is generally not recommended because its applications are limited and water

ingress resulting from failure can extend drying periods and could cause internal damage.

940 COMPLETION Roof Areas: Clean. Outlets: Clear. Work Necessary to Provide a

Weather-Tight Finish: Complete.

Storage of Materials on Finished Surface: Not permitted. Completed Membrane: Do not

damage. Protect from traffic and adjacent or high level working.

950 PROTECTION ON COMPLETION All completed works should be protected upon

completion to minimise risks of mechanical damage or contamination. Where possible,

access permits to working areas should be operational and a roof access strategy should

be in place. Defined walkway routes should be clearly marked and protected, and

guidance should be provided to all subsequent trades accessing the completed installation.

Appendix A: DANOSA UK Rainwater Goods

OverFlow Outlets

Product Name: FO-FLO Overflow Outlet

Material: Stainless Steel Spigot, 600mm Long

Flange: Polydan SBS Membrane

Sizes Available: 50mm Diameter

Extension Pipes Available: 250, 500mm

Accessories: Outlet Insulation Tubes


definitions.

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Vertical Rainwater Outlets

Product Name: FO-FLO Vertical Rainwater Outlet



Sizes Available: 75, 95, 110, 145, 160mm Diameter (to suit rainwater strategy).




definitions.

Parapet Chutes

Product Name: FO-PARAPET Parapet Outlet



Sizes Available: 110mm Diameter or 200 x 100mm (to suit rainwater strategy).




definitions.

Appendix B: Rooftop Service Solutions

Roofports (If applicable)

Product Name: Roofport

Material: Stainless Steel, 361mm High

Service Opening: 45, 105mm Diameter


Sizes Available 50, 110mm Diameter


definitions.

Roofport Retrofix (If applicable)

Product Name: Roofport Retrofit

Material: Aluminium, 350mm High

Service Opening 150 x 50mm

Sizes Available: 150m 400mm High


definitions.

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External works - Phase 2

4. Re-pointing / jointing & brick replacement summary The second phase of the project will involve investigating mainly the fifth floor level elevation areas, and some lower, localised levels where the pointing is showing evidence of weather erosion; these include the garages and communal bin store. The areas that have been identified at high level, form approximately a 1.000m - 2.000m deep perimeter band from parapet down, this is more pronounced on the rear elevations of the blocks, but there are areas on the other elevations that will require attention, an estimated total area of 240m2 will need investigation and possible attention. As a part of this refurbishment project Aster’s M&E team will be removing any redundant gas fire flues, leaving areas of brickwork in need of repair. Once the overall condition of the pointing has been assessed, the failed areas will need to be raked out to a depth of approximately 20mm and re-pointed using a matching coloured mortar with a hand jointed and pointed finish. All remedial work required to repair the damaged brickwork will need to be matched in using bricks of the same size, style and quality, reinstating the original stretcher bond.

Re-pointing & jointing specification

Cutting out, cleaning and repairing joints:

All cables must be carefully unclipped and kept protected during the preparation work stages. Care should be taken not to cut into pipe-work or conduit or damage the existing brickwork to ensure that remedial works are kept to a minimum. Consideration must be given to protect gas flues and open windows when working close proximity. All joints are to be raked /ground out to a minimum depth of 20mm, where mortar has been washed out and joints are largely empty, the joints must be deep tamped and if required hand grouted to fill the joint to the required depth before re-pointing. NB: Care must be taken with bricks manufactured with frogs, so not to remove too much material and undermine the structural integrity of the wall. If a tamped or hand grouted joint comes closer to the face than 20mm then it must be cut back to the proper depth and a square face prior to pointing. When cutting out areas of past or dense re-pointing, this should be achieved using pointing chisels and toothed masonry chisels with a two & half pound club hammer. Tools

must be narrower than the joint and excessive force must not be used to prevent damaging the brickwork. All cutting out must be left with a squared face at the back of the joint to provide optimum contact with the new mortar.

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Start of new pointing Prior to re-pointing clean down the face with a soft or stiff bristle brush and thoroughly flush with clean water. Dampen down the wall to control the suction of dry porous brickwork and prevent rapid drying of the mortar, shrinkage and loss of strength. The mortar mix should be a 4:1 ratio - 4 parts sand, 1 part cement and match the existing colour.

Begin pointing from the top and proceed downwards so that the work can be cleaned as it progresses. Press new mortar well into the joints and strike off flush leaving no voids. Avoid letting the mortar encroach over the brick arises and keep it slightly recessed to maintain clean edges.

Removal of mortar on faces If mortar does encroach onto the brick faces, this can be removed by washing and brushing, but if using proprietary cleaner containing acid then the masonry surfaces must be pre-wetted to limit absorption and must be washed down afterwards.

Protection Protect finished work from the sun and the rain until it has had sufficient time to harden. Do not carry out pointing work if there is a risk of frost (5 degrees and below) or very hot weather.

Supervision The contractor must ensure the supervision of pointing includes the following:

Approval of all cutting out and cleaning before re-pointing.

The mortar mix and colour must be approved and a sample of which should be retained for reference during the job.

Approval of all tools being used

Approval of a test area and supervision whilst this is being undertaken Other associated repairs should include removing any weather or structurally damaged bricks, then replacing them with matching size, style and quality bricks. NB: All wet trade work should ensure that a weather tight and tidy finish is achieved that will be expected to last future decades of weathering.

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5. Cladding – Trespa Meteon FR (Fire retardant grade) system

NB: This phase of the project must be carried out once all other wet trade work is

completed, the new cladding must remain cover protected until the buildings have

been cleaned of any dust and debris to ensure that it isn’t damaged or covered with

unwanted material.

Car park - pedestrian access doors and cladding

Carefully remove the existing timber panels from the metal framed garage doors, which serve both the front and side of the communal car park. Carefully remove the timber cladding from the galvanised metal framework and timber supporting framework, this is located adjacent to the pedestrian doors and on both sides of the garage roller shutter. Remove any rotten timber making up the supporting framework and replace where necessary using tanalised timber ready for re-cladding using the Trespa Meteon FR panel system. Supply and fix new 8mm Trespa Meteon FR panels to the original galvanised metal & timber framework, including the access door frames, and use corner finishing profiles where needed.

External facade panel cladding refurbishment Located directly below many of the windows of both blocks of flats are Superlux style cement board panels with a factory coated render finish, the panels are difficult to keep clean and will need to be replaced with a Trespa Meteon FR flush faced low maintenance panel system. The panels look to have been originally face fixed and sealed in around the brick reveals, they are mounted on a timber sub frame with mineral wool insulation behind. The original panels, insulation and framework will need to be removed in preparation for the replacement cladding system.

Removal of existing panels, insulation & sarking felt

Remove all of the face fixed Superlux panels located under the windows, sarking felt, and mineral wool insulation including their timber structural supporting sub framework. Carefully remove all evidence of previous applied heavy duty weather sealant from the panel apertures, this will be done using proprietary brick cleaning agents to ensure the cleaning process is successful and doesn’t risk damaging or discolouring the face of the bricks and pointing. NB: The prepared substrate must be devoid of any contamination or damage to ensure that the finished installation of the new Trespa Meteon FR panel cladding system is perfectly presented.

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Trespa Meteon FR (Fire retardant grade) Exterior Panel system

Supply and install new 8mm Trespa Meteon FR (Fire retardant grade) low maintenance exterior panel system supported on a new treated timber framework and insulated using a

75mm thick Rockwall Rainscreen Duo Slab Non-combustible thermal Insulation with a Tyvek UV façade roll underlay for weather protection. The contractor will need to confirm the individual aperture dimensions, and all new replacement panels must be factory cut to fit the openings replacing the original Superlux panels.

The Trespa Meteon FR (Fire retardant grade) Exterior panel system must be fitted to the requirements of the manufacturer’s instructions as outlined in their TS150 Timber frame fixing guide and supplied CAD drawings. The Rockwall Rainscreen Duo Slab must be fitted to the requirements of the manufacturer’s instructions as outlined in their Rainscreen cladding Timber rail application guide. Intumescent fire barriers must be supplied and fixed to all panel cavity entry and exit points to prevent the possible spread of flame in the event of a fire.

NB: The colour of the new Trespa panels will need to be agreed with Aster Group

prior to installation.

6. Cavity wall insulation

NB: This phase will be delivered by Dyson Energy Services Ltd and managed by the

Principle Contractor. This phase of the project will require the following: Further to an independent specialist site survey employed to investigate the condition of the existing cavity wall insulation it was deemed to have lost its cohesion evidencing areas of void space, which have created cold spots affecting some of the internal flat walls and their thermal performance.

A cavity wall insulation specialist to extract the existing cavity wall insulation from both of the flat blocks including a full cavity clearance and camera check with a report containing photographic evidence prior to being refilled.

Supply and installation of a new PVA bonded “zero dew point” platinum poly bead system or equivalent product to all elevations.

On completion of the work, the specialist contractor should undertake a thermal camera survey of all elevations of both blocks with a detailed report illustrating that the new cavity insulation improvements have successfully brought the energy performance rating up to current standards.

This work must be certificated under CIGA with insurance backed guarantee and make use of any grant finance available to this scheme.

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Site preparation The installing technician must ensure that the property has been correctly assessed and is suitable for cavity wall insulation. Any problems encountered during drilling process which prevent compliance with the CWI Certificate are to be reported back to the Contracts Surveyor immediately. Essential ventilation openings providing combustion air or under floor ventilation, and all flues in the cavity wall must be checked. If adequate sleeving or other cavity closures are not present, installation must not proceed until these openings have been sleeved or otherwise modified to prevent blockage by the new cavity wall insulation. All uncapped cavity walls should be sealed prior to installation.

General

The product is installed using an approved system either based on compressed air delivery or electric fan delivery system. The installation company provides all necessary hoses, drilling tools, equipment and materials for making good the walls after the installation.

Procedure

Holes of 22 mm or 26 mm diameter are drilled between bricks at the junction of the horizontal and vertical mortar joints. Sufficient injection holes must be drilled to ensure that the cavity will be completely filled without voids. The holes are normally spaced not more than 600 mm horizontally apart and the top row of holes in each wall is not more than 200 mm from the top of the wall. A similar series of holes is drilled below windows and obstructions. Alternatively, a series of holes is drilled approximately 600 mm horizontally apart and 200 mm above the highest ceiling level. Additional holes should be drilled between windows, doors and other obstacles where necessary. It is important to ensure flues are not obstructed by the installation of the product, the correct functioning of these should be checked once the installation is complete. To prevent debris falling onto the insulation, installation should not start until the drilling has been completed on each elevation. Installation should be conducted in accordance with the drilling pattern and should take place from the lowest injection holes up, with the product installed into the upper holes only after all of the lower holes have been filled. Care should be taken to ensure any holes drilled in the upper floor do not correspond with intermediate timber floors or that the insulation does not fill into the roof space. Any insulation that has been blown through the top of the cavity into the loft space should be removed and any points of leakage sealed. After injection of the product, the drill holes are fully filled with a mortar mix of a similar colour, texture and weather-tightness as the existing mortar. Where a wall requires a high degree of colour matching, the level of finish matching should be agreed in writing during the survey. All the trunked air vents are checked, e.g., those providing under floor ventilation and combustion air for heating appliances. In all cases flues are carefully

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checked on completion of the installation by means of an appropriate test (e.g., a smoke test) to ensure that they are not obstructed by the insulation. In some circumstances access for drilling injection holes and filling with insulation may be limited by features for example carports, conservatories, cladding or tiling. The practicability of safely accessing and making good these areas, or installing the insulation through the inner leaf, may outweigh the benefits of insulating these areas. In such situations, the surveyor should explain that heat loss through un-insulated areas will not be reduced and they will also be subject to a slightly higher risk of condensation. The assessor, therefore, should obtain written consent for omitting any areas of the wall from the party commissioning the work.

7. External decoration All redecoration work must be fully weather resistant and presented with an aesthetically pleasing finish. The external decoration to be addressed will include both blocks and their communal areas, which are as follows: NB: Careful cleaning and preparation must be carried out to all component areas identified below.

Refer to Crown Paints Technical Specification supplied by Gary Johnson (Aster

Group) Refer to appendix

(The work below is set out for both blocks)

Concrete ring beam Decorate the concrete ring beam that divides the basement parking area from main building. 240LM

Handrails and uprights Clean & prepare the entire timber handrail, then stain/varnish. 62LM Clean & prepare metal posts supporting handrail and paint 40 No. Clean & Prepare metal railings 16LM Wash down uPVC windows x 400 No.

Front Entrance Porch Clean & prepare the Fascia above the front entrance porch canopy - Stained 24LM Clean & prepare the Timber T&G boards making up the porch canopy soffit and stain/varnish. 16SM Clean & prepare the timber front entrance doors – varnished x 4 Clean & prepare the timber frame and windows – varnished x 16 Clean & prepare the timber corner post – varnished 6LM

Bin Store Clean & prepare the rendered fascia panel above the bin store access doors and redecorate using a colour matching the new Trespa Meteon panel system. 4M2

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8. Gas flues & Extractor fans

NB: (Aster in-house M&E team to manage this stage of the project) Aster Group will require the necessary scaffold access by the Principle Contractor to deliver this phase of the programme. This phase will involve the removal of redundant gas flues and the supply and installation of new kitchen and bathroom extractor fans where required.

Contract Requirement

The Principle Contractor shall provide Building Regulation compliance certificates to Aster Group on completion of work. The Principle Contractor will provide a full programme with estimated timeline covering all aspects of the project for Aster’s approval. The Principle Contractor will be fully conversant with Danosa & Trepsa specifications and request any information not contained therein prior to starting work on this project. Where suspected asbestos containing materials are found, these are to be tested prior to commencement of work to confirm type of asbestos. Any further repair works found are to be undertaken as directed where necessary after approval from Contract Administrator.

Program period The roofing refurbishment to both blocks of flats and all other associated external works are to be undertaken and completed during the Autumn/Winter between the months of October 2017 to January 2018.

Documents

Specification of Workmanship and Materials...1 Specification of Workmanship and Materials Flat Roof Renewal & External Maintenance to: Wimbledon Hall Derby Road, Bournemouth, BH1 3PP