I'm not sure how roofing is done in England but here in Canada we put sheets of plywood over the rafters before installing the roofing material (tile, asphalt shingles or whatever) so the spray foam would never touch the tiles, etc. Thus, this becomes a non issue
Yes if it's done correctly I think it's supposed to not touch the beams and also has to be the open cell foam not the closed one because it breathes. At the moment it's not regulated so lots of contractors came and did it wrong and if the buyer didn't do a survey they now have a costly problem. I myself am looking into this as the house I made an offer for turned out to have this spray foam. Even if my lender accepts my application for a mortgage I don't know if I want to get into this as I might not be able to sell the house in the future... Not sure what to do now but waiting for the answer from the owner about what type of foam it is and from lender if they will give me mortgage. Then I'll do a survey if I still want the house with these extra costs of removing it. If anyone is reading and can advise me, please do
The worst case scenario is that you need a new roof, possibly including rafters. This may not be as expensive as you think (plus you get a nice new roof).
I'm not sure how roofing is done in England but here in Canada we put sheets of plywood over the rafters before installing the roofing material (tile, asphalt shingles or whatever) so the spray foam would never touch the tiles, etc. Thus, this becomes a non issue
Yes if it's done correctly I think it's supposed to not touch the beams and also has to be the open cell foam not the closed one because it breathes. At the moment it's not regulated so lots of contractors came and did it wrong and if the buyer didn't do a survey they now have a costly problem. I myself am looking into this as the house I made an offer for turned out to have this spray foam. Even if my lender accepts my application for a mortgage I don't know if I want to get into this as I might not be able to sell the house in the future... Not sure what to do now but waiting for the answer from the owner about what type of foam it is and from lender if they will give me mortgage. Then I'll do a survey if I still want the house with these extra costs of removing it. If anyone is reading and can advise me, please do
The worst case scenario is that you need a new roof, possibly including rafters. This may not be as expensive as you think (plus you get a nice new roof).