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Spray foam on corrugated roof

  • 02-04-2018 10:54AM
    #1
    baldric
    Registered Users, Registered Users 2 Posts: 71 ✭✭


    HI , I have a question about spray foam on two issues, each has an old corrugated roof.

    1. the first is an old residential building with timber joists in excellent condition in the corrugated roof, it has no attic or crawl space so living space is into the roof. The requirement is to spray foam, and on completion to batten out and tongue and groove the ceiling. The foam is required to prevent condensation and to insulate the roof space. I think I need:
    ----open celled?
    ----75mm?
    ----direct onto the corrugated, without card.

    Is this reasonable is there anything else I am missing out on? Any useful tips, Is there any FIRE issue with this and use of timber tongue and groove?

    2. AN old corrugated Barn, steel struts and supports, to be used for storage but maybe as an occasional community/function area. Condensation is a big issue here, and there is a concern if it is used for community purpose in the future that there will be a fire officer issue. Is there an intumescent spray foam, is it ridiculously expensive? if not is it normal practice to cover spray foam with intumescent paint? And if so would open cell with a cover of intumescent paint be the way to go? Or closed Cell?

    Basically Any ideas on the most cost effective way to spray foam a barn that might have public use in the future, all help appreciated, baldric :):)


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