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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Installing Foam roofing insulation directly over joists?
In my local B&Q last week I was reading the packaging of their 'Space Board'
product, sheets of foam insulation made by Knauf. I am assuming, never having seen any, that this is similar to Kingspan or Celotex? Anyway, since I'm thinking of properly insulating, and maybe boarding, the loft, at some point soonish, I read the installation instructions. They say, and the website confirms: http://www.space-insulation.com/board.html that you can put the board directly *over* the existing joists, and then put chipboard on top, screwing through the chipboard and foam into the joists. Does this work? It seems an attractive method to get a decent total thickness without fitting additional 4x2s across the joists etc., as I've seen recommended here. But I'd worry that the foam would deform under the chipboard, leading to a horrid result in time. And if it does work ... would it also work with Celotex/Kingspan? Thanks for your thoughts Jon N |
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