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

Definition: An external wall is defined as being:

(i) anything located within any space forming part of the wall;

(ii) any decoration or other finish applied to any external (but not internal) surface forming part of the wall;

(iii) any windows and doors in the wall and

(iv) any part of a roof pitched at an angle of more than 70 degrees to the horizontal if that part of the roof adjoins a space within the building to which persons have access, but not access only for the purpose of carrying out repairs or maintenance.

Requirement: All materials to achieve combustibility class A2-s1, or better, unless they are exempt within 7(3).

December 2018 Amendment

Section 2 Reference: 2(6)(a).

Reference title(s): Any reference to an “external wall” of a building includes a reference to — (see explanation / notes above).

Approved Document

Section B4: External fire spread:

  • Section 10.1 Resisting fire spread over external walls
  • Section 10.3 Combustibility of external walls
  • Section 10.5 External surfaces
  • Section 10.6 Materials and products
  • Section 10.9 Materials
  • Section 10.10 Defining ‘relevant’ buildings

Appendix A: Key terms *External wall

MHCLG FAQS / Advice Notes

Reference: None

Reference title(s): None


Is the item exempt from Regulation 7(2), in accordance with Regulation 7(3)?: No

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.