Tom Posted September 18, 2023 Share Posted September 18, 2023 (edited) Hi all, looking some advice on the question of vapour barriers. Out roof make up (from outside to in) is 150mm composite panel (essentially PIR sandwiched between sheet metal) 200mm rockwool plasterboard I had planned to tape the internal seams between the composite sheets for airtightness. Do I also need a vapour barrier? Many thanks Tom Edited September 18, 2023 by Tom typo, thanks markc.... 1 Link to comment Share on other sites More sharing options...
markc Posted September 18, 2023 Share Posted September 18, 2023 You have plasterboard on the outside? Link to comment Share on other sites More sharing options...
Tom Posted September 18, 2023 Author Share Posted September 18, 2023 Yep. Moisture resistant. Should have gone for Aquapanel in retrospect Link to comment Share on other sites More sharing options...
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