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.
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.