Damage To Roofs
Foam has often been applied to the underside of timber framed roofs, primarily as a cure for slate slippage on old roofs with decaying nails. But this can cause serious structural problems. Water reaching the timber structure is no longer able to drain & evaporate away, and timber can saturate and rot. The foam makes inspection of the timber structure impractical.
The adhesion between foam and slate also makes later reuse of the slates impossible, adding significant extra cost to the eventual reroof. Because of these 2 problems, spray foam lining timber framed roofs is now regarded as bad practice in the UK.
Read more about this topic: Spray Foams (insulation), Disadvantages
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