Can I use thermoplastic insulation materials in a warm roof deck which passes over a compartment wall?

National House Building Council, Can I use thermoplastic insulation materials in a warm roof deck which passes over a compartment wall? In: Frequently asked questions on Building Regulations Part B: Fire Safety. TBA ed. Frequently asked questions on Building Regulations . National House Building Council, p. 1.

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Abstract

No, thermoplastic insulation materials should not be used in this situation, as referenced in Diagram 29 and Diagram 30 of Approved Document B:2006 Vol. 2. The reason for this restriction is that thermoplastic insulation materials have a tendency to melt and the resulting voids can provide a route for fire spread over or through the line of compartmentation.

Thermo-set insultation, such as Polyurethane (PUR), Polyisocyanurate (PIR) and Phenolic foam, whilst technically classed as combustible, is acceptable as they tend to exhibit charring behaviour when exposed to fire, and so are acceptable and permitted to cross the line of compartmentation.

Providing the roof covering can achieve the external fire rating of AA, AB or AC, thermo-set insulation products are acceptable with adequate fire stopping to ensure the potential for fire spread over or around the insulation is restricted.

Item Type: Book Section
Additional Information: mml-maui-text-analytics-keywords
Uncontrolled Keywords: thermoplastic material, compartmentation, b4 external fire spread, fire safety - volume 1: dwellings. 2019 edition - for use in england, b2 internal fire spread linings, fire safety - volume 2: buildings other than dwellings. 2019 edition - for use in england, fire-stop (Fire-stopping), b3 internal fire spread structure, fire risk assessment, non-combustible material
Subjects: T Technology > TH Building construction > Building standards
Depositing User: admin
Date Deposited: 06 Feb 2021 16:23
Last Modified: 13 Oct 2021 19:43
URI: https://buildvoc.co.uk/id/eprint/994

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