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Yeah I also read that on a celotex product info doc… it’s not had any sunlight but a fair bit of rain over a few days. But doesn’t seem this is common practice that builders I know actually keep it covered if rain is expected. So wondered if it was more the company covering themselves rather...

Hello all Couldn’t find an exact answer to this in an existing thread… but other sites I had come across suggest that celotex is not supposed to get wet or rather be exposed for long periods eg over 24 hours of rain. I am having a rear flat roof extension done and the builder is using the 90mm...