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insulating and boarding RSJ's

E

essex123456

Joined
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I have several RSJ to board out, one is above a set of external doors I gather this has to be insulated with PIR, to stop thermal bridging and then either fireboard or double boarded?

Inside the house I have two steels and a steel support post. the two steels sit either side of a cold roof space, am I OK to insulate between these with PIR? and then again fireboard? also does the support post have to be boarded, the post is 8mm 150mm box section.

Thanks for the help.
 

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