thaldine Posted February 16, 2021 Share Posted February 16, 2021 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 Link to comment Share on other sites More sharing options...
ProDave Posted February 16, 2021 Share Posted February 16, 2021 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. Link to comment Share on other sites More sharing options...
Gone West Posted February 16, 2021 Share Posted February 16, 2021 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. Link to comment Share on other sites More sharing options...
thaldine Posted February 17, 2021 Author Share Posted February 17, 2021 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. Link to comment Share on other sites More sharing options...
ProDave Posted February 17, 2021 Share Posted February 17, 2021 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. Link to comment Share on other sites More sharing options...
thaldine Posted February 17, 2021 Author Share Posted February 17, 2021 (edited) 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, 2021 by thaldine Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now