Rich123 Posted January 4, 2021 Share Posted January 4, 2021 (edited) Hi all , hope all are well . I have an issue with a new build extension . It’s timber frame and I have been building it with sub contractors over the past 2 months. the roof is on and it’s plaster boarded , heating is on , underfloor in slab. in the past few days we had very cold still weather, I noticed a dripping from inside the frame and removed a board to see condensation which was dripping through the vapour barrier. This is external condensation which is tracking through the vapour barrier. Obviously the frame went up in very wet conditions and my theory is that the low temperature has resulted in the damp frame evaporating and freezing on the roof . The ceiling is vaulted so there is no loft space. Is this reasonable assumption and if so will it resolve itself as it dries, and how long may this take ? one issue is that the Vapour barrier is lapped down and on to the ceiling insulation , which is forming a low point , not ideal but will it be a long term issue ? Any thoughts would be appreciated. Edited January 4, 2021 by Rich123 Spelling Link to comment Share on other sites More sharing options...
Russell griffiths Posted January 4, 2021 Share Posted January 4, 2021 Need a few more details roof build up sketch of roof build up insulation type and levels do you have an internal vapour barrier what type of roof ventilation Link to comment Share on other sites More sharing options...
Rich123 Posted January 4, 2021 Author Share Posted January 4, 2021 (edited) Hi roof build up is outside to in tiles 25 mm air gap breather Kingspan nil vent ventilated eves 25 mm ventilated ridge 150 x 47 timber with 100 mm cellotex between studs 50 mm insulation under taped to form vapour barrier. vertical VB on external timber frame walls taped to ceiling with silver foil . Edited January 4, 2021 by Rich123 Sketch added Link to comment Share on other sites More sharing options...
Big Jimbo Posted January 30, 2021 Share Posted January 30, 2021 Rich 123. Did you find out what your problem was ? Link to comment Share on other sites More sharing options...
Jason L Posted January 30, 2021 Share Posted January 30, 2021 12 minutes ago, Big Jimbo said: Rich 123. Did you find out what your problem was ? It looks like there is insulation on the outside of the frame, which should be a ventilated cavity. Link to comment Share on other sites More sharing options...
Big Jimbo Posted January 31, 2021 Share Posted January 31, 2021 10 hours ago, Jason L said: It looks like there is insulation on the outside of the frame, which should be a ventilated cavity. Yes i see that, which is a naughty. But from where he says the water is coming in , i would expect that if he had a problem it would be the roof. 1 Link to comment Share on other sites More sharing options...
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