Fire-rated foam around twin wall flue?

Fire-rated foam around twin wall flue?

Fire-rated foam around twin wall flue?

A twin wall flue will penetrate a flat roof about 1.7m above a wood burning stove.

The warm roof comprises OSB - Celotex - OSB - EPDM.

Can I fill the 60mm gap that must be left around the twin wall flue, with fire rated foam, for example this?

https://www.firesealsdirect.co.uk/fire-rated-expanding-foam.html

I have heard of this being done, but I don't know what kind of foam was used, or whether it's acceptable.

Cheers
Richard

by geraldthehamster

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