19/06/2019
Haven’t posted for a while, but though I would from time to time share some property experiences ie ‘Top Tips’ now and again.
Subject today is spray foam insulation. This was popular in 70’s & 80’s as a simple solution to thermally insulate the roof space in addition to or instead of traditional loft floor quilt.
Two major issues: 1. The loft space requires continuous cross flow of fresh air usually via the eaves or gable end vents to reduce condensation and avoid mould growth. Therefore foam covering the undersides of pitches thermally is pointless and 2. More seriously, the foam seals off the underside of the timber structure. Any moisture settling above can cause rot attack to the structure, Most of the time unseen until structural failure occurs.
There are other issues such as fire hazard by being flammable alongside some types releasing high levels of formaldehyde, cancer causing if breathed in. Most mortgage lenders won’t lend on sealed roofs, so my advice is carefully scrape it off, bag it up and dispose of it responsibly.
