Rufus77 Posted March 16, 2021 Share Posted March 16, 2021 Last year we noticed a growing damp patch on the inside of a gable end wall next to the chimney breast in an upstairs room. It eventually got so damp that part of the ceiling collapsed. We hired a roofer to fix the leak but despite having a new roof on half of the house and having the chimney repointed and reflashed, the internal wall and ceiling are still damp. We’ve had a dehumidifier on full every day but it just isn’t drying out. There is some cracking to the rendering on the external wall although it’s not exactly where the internal damp problem is. We’re also aware that we have a lack of ventilation in our loft space but could either of these things be causing such damage? I’ve attached some photos. Can anyone please advise what could be causing the problem and how we can fix it. Many thanks. Link to comment Share on other sites More sharing options...
SteamyTea Posted March 16, 2021 Share Posted March 16, 2021 I had some cracked render, the water came in a good 2 metres from the damage. I also had the loft insulation move (as have half my neighbours) a few inches in a storm. Was enough to just cover over the soffit vents, then each time a hoolie came in, water got soaked up into it, then into the ceiling below. 1 Link to comment Share on other sites More sharing options...
markc Posted March 16, 2021 Share Posted March 16, 2021 Trying to look at the pics on a small screen so correct me if im wrong. Is there a gap under the flashing that will allow water under and onto/over the gable boards? ks like Whats stopping water being blown under the blue flashing? 1 Link to comment Share on other sites More sharing options...
tonyshouse Posted March 16, 2021 Share Posted March 16, 2021 Rotten mortar on the chimney sucks in water when it rains, this then percolates downwards through the walls and tries to get out inside and outside 1 Link to comment Share on other sites More sharing options...
Rufus77 Posted March 17, 2021 Author Share Posted March 17, 2021 16 hours ago, markc said: Trying to look at the pics on a small screen so correct me if im wrong. Is there a gap under the flashing that will allow water under and onto/over the gable boards? ks like Whats stopping water being blown under the blue flashing? No there's no gap. I think it's just the photo. Link to comment Share on other sites More sharing options...
Rufus77 Posted March 17, 2021 Author Share Posted March 17, 2021 We've had the chimney repointed. Would painting it with a breathable brick sealant be a good idea? Link to comment Share on other sites More sharing options...
tonyshouse Posted March 17, 2021 Share Posted March 17, 2021 No 1 Link to comment Share on other sites More sharing options...
Rufus77 Posted March 18, 2021 Author Share Posted March 18, 2021 16 hours ago, tonyshouse said: No Thanks. Do they not work then? Link to comment Share on other sites More sharing options...
tonyshouse Posted March 18, 2021 Share Posted March 18, 2021 Might make it worse water running down can capillary into cracks and then find a downhill path onside the masonry effectively sucking water in, previously water was absorbed by the bricks a bit is then available to be drawn in. Link to comment Share on other sites More sharing options...
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