Russell griffiths Posted February 11, 2020 Author Share Posted February 11, 2020 7 hours ago, Ed Davies said: From what I've read elsewhere PIR tends to shrink anyway given enough time so it might actually be better for long-term lack of thermal bypass to have stuff like this if it's already done all the shrinking it's likely to do. This is a major reason I plan to have a separate airtightness layer rather than taping the PIR foil. My exact thoughts art this moment, I would be happy re,trimming to get a square edge back, I just want the supplier to know I’m not happy and send me some free goodies. Link to comment Share on other sites More sharing options...
Russell griffiths Posted February 11, 2020 Author Share Posted February 11, 2020 My stuff that has shrunk is called ECOTHERM. 50mm perfect 70mm terrible. Link to comment Share on other sites More sharing options...
PeterW Posted February 11, 2020 Share Posted February 11, 2020 Speak to the merchant - it’s normally pretty good quality. Link to comment Share on other sites More sharing options...
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