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Wetheralds Ltd – Timber Roof Description of Product
The Wetheralds Insulated Roof System (Patent
applied for) is a solid roof insulation system
that replaces existing translucent panes or
panels of a domestic conservatory or porch,
whilst retaining the existing aluminum profiles,
ties, and other structural components of the
roof. This roof system achieves a u-value of
0.18W/m2K when installed in compliance with
the specification and thermal design.
This Registered Solution applies to the roof
only. It is designed to fast-track, not remove,
the requirement to obtain Building Regulation
Approval through LABC. This can only be
demonstrated through a Completion Certificate
issued following satisfactory inspections made
as part of a valid Building Regulation
application by Local Authority Building Control
teams.
Key Factors Assessed
Mechanical Resistance & Stability
Safety in case of Fire
Health, Hygiene and Environmental
Safety in Use
Energy Economy and heat retention
Durability serviceability and identification
Validity
This certificate was first issued on 15th April 2015 and is valid until 1st September 2019.
Issue Dated 18th September 2018
Certificate No: EW544K
Approved Document A: The existing structure will need to be assessed to ensure its adequacy for taking any additional
loads and may include exploratory investigation of the existing construction. For every project a structural survey will be
undertaken looking at the existing conservatory build and a bespoke structural report / design and drawings will be made
available and checked by the Partner Authority.
• The existing mullion / outer frame elements are assumed to be linear components, every site shall have section and
material properties checked to ensure that they equal or exceed those assumed values stated in the relevant structural
calculation pack.
• The existing structure will need to be assessed to ensure its adequacy for taking any additional loads and may include
exploratory investigation of the existing construction.
Approved Document L1B states that the amount of glazing allowed to an extension is 25% of the floor area. In order for
this limitation not to apply, there should be:
1. Effective thermal separation must be maintained between the dwelling and former conservatory or porch.
2. Any existing independent temperature and on/off controls to any heating system installed within the former conservatory
or porch may be maintained.
Refer to http://www.labc.co.uk/sites/default/files/labcpd0115_householder_conservatory_guide.pdf LABC guidance on solid
roofs to conservatories and porches attached to dwellings
http://www.labc.co.uk/sites/default/files/labcpd0115_techg_conservatories.pdf
The roof specification designed to achieve 0.18 W/m2K comprises;
Lightweight Britmat slate, Metro tile or Tapco roof tile nailed to 25x25mm treated tile battens spaced to suit lightweight tile
panel. Batten to be sat on BS EN 13859-1 : 2014 breathable felt and 12mm external ply boarding on designed timber rafters
physically connected to retained aluminium profile. Minimum of 25mm air space is to be provided above and below the
125mm Actis HYBRIS reflective insulation maintained with additional counterbattens if required. 25mm counterbatten fixed
to underside of retained profile with 45mm Hcontrol Hybrid, Multi-Foil Insulation fixed beneath timbers and retained with
further 25mm timber batten and 9.5mm plasterboard and skim finish. Proprietary tile ventilation to be provided at eaves
and ridge to give cross ventilation above insulation in compliance with Approved Document F.
Installation is undertaken by a Wetheralds Installer. A bespoke structural design will be submitted for every roof installation
Light fittings should not penetrate the vapour barrier.
The Registered Detail relates to the reroofing of existing conservatory or porch roofs that satisfy the requirements of
Schedule 2, Class 7 to the Building Regulations 2010 (as amended); i.e. It must be at ground level; it must not exceed 30 m2
in floor area; the thermal separation between the building and the conservatory or porch must be maintained; and the
building’s heating system must not be extended into the conservatory or porch. If the thermal separation is removed then
a separate Building Regulation Application needs to be submitted and the amount of glazing to the former conservatory or
porch should be reduced to less than 25% of the floor area and the glazing should achieve a U-value 1.6W/m2.K
(alternatively heat loss calculations may be used).
Ensure existing rainwater goods are retained, if none exist these should be provided.
Site specific calculations shall be provided, any deviations on construction shall be referred to their engineer and separate
details will be required including verification of adequacy of any retained eaves beam before works are substantially
commenced.
LABC consider that, Wetheralds Roof System, will meet the functional requirements of the Building
Regulations (listed below) if the criteria detailed in this certificate are met;
The Building Regulations 2010 (as amended) England & Wales
Regulation 7 Materials and workmanship
Note: The products are acceptable.
AD A Structure
Note: Subject to limitations detailed in Conditions section.
AD B Fire Safety
Note: The products can contribute to meeting this Requirement.
AD C Site preparation and resistance to contaminants and moisture
Note: The products can contribute to meeting this Requirement.
AD L1B Conservation of fuel and power
Note: The thermal insulation performance of this system should be considered in the
context of the contribution made to the overall performance of the roof
structure.
The Building Regulations 2010 (as amended) England
None presently.
The Building Regulations 2010 (as amended) Wales
None presently.
The Building (Scotland) Regulations 2004 (as amended)
If you would like to discuss a specific use of the product in Scotland it will require an additional
assessment under the Scottish Building Regulations and accordingly you should contact the LABSS
STAS Administrator at www.labss.org
LABC Warranty
The use of the Wetheralds Roof System has not been assessed to meet the requirements of the
LABC Warranty Technical Manual. If you would like to discuss a specific use please make an enquiry
Sign St C209 Structural Calculations
Sign St C214 Structural Calculations
twjh 140721 – rp0002 Condensation Risk Calculations
twjh 140721 – rp0003 Condensation Risk Calculations
twjh 140721 – rp0004 Condensation Risk Calculations
twjh 140721 – rp0004 Condensation Risk Calculations
twjh 140721 – rp0005 Condensation Risk Calculations
twjh 140813 – rp00010 Condensation Risk Calculations
twjh 140813 – rp00011 Condensation Risk Calculations
twjh 140813 – rp00011 Condensation Risk Calculations
Wetheralds Roof Type Matrix detailing required timber sizes
Typical Scenarios for Tie Removal
Appendix B Eaves (Ring) beam remediation detail
Surveyor Procedures
Installation Procedures
Roof Junction Details
Roof Section Detail sheet
Tapco Roofing System Downlight Cross-section Revision C
Metrotile Roofing System Downlight Cross-section Revision C
U Value Calculation 00 TE 2016 (r-p) issued 4th January 2017
Condensation Risk Analysis 00 TE 2016 (r-p) issued 4th January 2017
Wetheralds Insulated Conservatory Roof Systems
Unit 14
Bypass Park Estate
Sherburn in Elmet
Leeds
LS25 6EP Telephone: 0800 112 3358
Email: [email protected]
Website: www.wetheralds-roofsystems.co.uk