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: Cavity tray when used anywhere other than between two leaves of masonry (e.g. brick and rainscreen outer skin with SFS inner backing wall).

Requirement: Cavity tray products / materials to achieve combustibility class A2-s1, d0 or better.

This is unless the product's primary function is to be a cavity barrier, and the cavity tray is a secondary function. In which case the cavity tray must be installed in a location that will enable it to function as a cavity barrier.

7(3)(f) which provides an exemption for: "... intumescent and fire stopping materials where the inclusion of the materials is necessary to meet the requirements of Part B of Schedule 1...".

Note: MHCLG's January 2020 update "Review of Ban on use of combustible materials…." is currently consulting evidence on whether a temporary 18-month relaxation for cavity trays (not achieving combustibility class A1 or A2-s1,d0) should be provided in all forms of external wall construction in relevant buildings. To give industry sufficient time to bring additional reliable compliant products to market, and for industry to adapt to their use.

Is the position indisputable? The relaxation for cavity trays that are cavity barriers may not be the view of all organisations.

December 2018 Amendment

Section 2 Reference: None.

Reference titles: None.

Approved Document

Reference title(s): 10.6.

References: Materials and products: Where regulation 7(2) applies, that regulation prevails over all the provisions in this paragraph.

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.