We’d like to remind Forumites to please avoid political debate on the Forum.
This is to keep it a safe and useful space for MoneySaving discussions. Threads that are – or become – political in nature may be removed in line with the Forum’s rules. Thank you for your understanding.
The MSE Forum Team would like to wish you all a Merry Christmas. However, we know this time of year can be difficult for some. If you're struggling during the festive period, here's a list of organisations that might be able to help
📨 Have you signed up to the Forum's new Email Digest yet? Get a selection of trending threads sent straight to your inbox daily, weekly or monthly!
Has MSE helped you to save or reclaim money this year? Share your 2025 MoneySaving success stories!
External & Cavity Wall Insulation - can you use PIR with membranes?
Comments
-
Condensation forms in the cavity as well as penetrating moisture. With a full fill insulation it can track back in the joins, whereas with correct type it can't because of the way the edges are formed.2
-
Ah, yes I recall the stuff they used in my wall had a T&G edge so's they interlocked.I'd personally still be happier with a tight-against-the-inside-skin layer, with a gap between it and the outer one.The plastic clips went on the ties and were just pushed up tight to press them against the inner skin.1
-
Leave cavity empty. It was put there for a reason. Externally do not use cladding as it retains moisture being based on concrete. Go for Decopierre or Stonecoat lime based renders that offer insulation properties without the upheaval of EWI thickness causing issues with pipes, window reveals, soffits, DPC,. New nano tech formed internal insulation products are 4 mm thick and breathable. Great for behind plaster and over floor insulation.
0
Confirm your email address to Create Threads and Reply
Categories
- All Categories
- 352.9K Banking & Borrowing
- 253.9K Reduce Debt & Boost Income
- 454.7K Spending & Discounts
- 246K Work, Benefits & Business
- 602.1K Mortgages, Homes & Bills
- 177.8K Life & Family
- 259.9K Travel & Transport
- 1.5M Hobbies & Leisure
- 16K Discuss & Feedback
- 37.7K Read-Only Boards