Key

 

Warranty Position Regulatory Position and Guidance Exemptions Does B4 still apply?
Green indicates we consider our position best practice and not in dispute Grey items cover the December 2018 Amendments, Approved Documents and MHCLG's own FAQs and advice notes Green indicates that the item IS exempt from Regulation 7(2), in accordance with Regulation 7(3) Green indicates that B4 still applies, and refers to relevant parts
Yellow indicates our position has the potential to be subjective   Red indicates that the item is NOT exempt. Refer to Regulation 7(3) Red shows that B4 no longer applies

 

Warranty Position

Explanation/Notes: If the slope of the roof in which the dormer is installed exceeds 70 degrees then the materials that form the walls to the dormer need to be combustibility class A2-s1, d0 or better.

Is the position indisputable? Yes

December 2018 Amendment

Section 2 Reference: None

Reference titles: None


Approved Document

Section 11.14: Roofs: Vertical parts of a pitched roof, such as dormer windows, should be included only if the slope of the roof exceeds 70 degrees

It is a matter of judgement whether a continuous run of dormer windows that occupies most of a steeply pitched roof should be treated as a wall rather than a roof.


MHCLG FAQS / Advice Notes

Reference: None

Reference title(s): None

Exemptions

Is the item exempt from Regulation 7(2), in accordance with Regulation 7(3)?: N/A

Reference: None

Statement: None

If exempt, are there any restrictions on the use of the system, component or material given in the guidance in ADB vol 2? None

Does B4 still apply?

Yes:  Reference: B4-(1)

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Disclaimer: The information in this document is believed to be correct in light of information currently available and at the time of publication but is not guaranteed. Neither LABC Warranty nor its agents can accept responsibility in respect of the contents or any events arising from the use of the information contained within this site. The guidance provided does not replace the reader’s professional judgement and any construction project should comply with the relevant Building Regulations or applicable technical standards. For the most up to date LABC Warranty technical guidance please refer to your Risk Management Surveyor and the latest version of the LABC Warranty Technical Manual.