Photo/isometric drawing

provided by manufacturer

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

to technical.services@labcwarranty.co.uk

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: info@wetheralds.net

Website: www.wetheralds-roofsystems.co.uk