February 16, 20215 yr I'm looking at having Icynene installed under a suspended timber ground floor and underside of currently cold roof in modest sized 1950s bungalow. Motivation is to bolster insulation and also air tightness. Should I be concerned about how valid the breathability claims are in practice in terms of potentially causing timbers to be exposed to moisture that doesn't dry out ? Same for Icynene's lack of hygroscopic properties ? Also can anybody who's experienced it post-install confirm the odour does pass ? Thanks
February 16, 20215 yr Before you do that, google spray foam roof insulation and mortgages. A lot of surveyors and mortgage lenders have a huge problem with spray foam roof insulation and many recommend a new roof as the only solution.
February 16, 20215 yr 55 minutes ago, thaldine said: Also can anybody who's experienced it post-install confirm the odour does pass ? Our house has 350mm of Icynene in the walls and roof and the smell disappeared a day or two after being installed.
February 17, 20215 yr Author Thanks @ProDave and @PeterStarck. Regarding the mortgage point , it seems to be less on the lenders/surveyors radar for floors than roofs/lofts. According to the posts they don't seem to differentiate between open and closed cell. Still not found an idiots guide on how to insulate and make loft/roof more airtight using traditional non-spray methods.
February 17, 20215 yr Post some pictures of the roof and what you are trying to do. I think spray foam properly applied in a new build is okay. The issue with mortgages is an old roof, with no under felt, and spray foam applied from the inside as a "fix" makes the roof completely un repairable as the tiles are stuck by the foam,. so in the event of any repairs then being needed it is a new roof required.
February 17, 20215 yr Author Right, I had assumed their problem was because they had a moisture concern regarding the roof timbers but you seem to be suggesting it might be the fixity to the roof covering itself that is their problem. I am trying to add a decent amount of insulation that is protected from wind wash and at the same time improve the airtightness. Edited February 17, 20215 yr by thaldine
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