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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

Definition: Continuous thermal breaks (e.g for cantilevered concrete slabs).

Requirement: Thermal breaks are exempt.

The underside of the thermal break should be protected by non-combustible materials (or cavity barriers).

The Approved Document B guidance that thermal breaks should not pass across compartment lines was intended to prevent large areas of insulation or 'infill' being called a 'thermal break" and thereby bypassing the regulatory requirement.

Is the position indisputable? This may not be the view of all organisations.

December 2018 Amendment

Section 2 Reference: None.

Reference titles: None.

Approved Document

Reference title(s): 10.15(e).

References: They should not span two compartments and should be limited in size to the minimum required to restrict the thermal bridging.

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)?: Yes.

References: 7(3)(i).

Statement: Thermal break materials where the inclusion of the materials is necessary to meet the thermal bridging requirements of Part L of Schedule 1.

If exempt, are there any restrictions on the use of the system, component or material given in the guidance in ADB vol 2: Thermal breaks should not span two compartments.

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.