Alwayslearning22 Posted March 26, 2023 Share Posted March 26, 2023 I’ve a ground floor extension and I noticed I’ve a nasty draught coming from one of my smoke alarms, it’s a cold roof above it. I’d imagine this shouldn’t be happening as my house is supposedly air tight. the extension came with the house. how would I go about fixing this? finding the source of the leakage? Or is it impossible and just forget it. Link to comment Share on other sites More sharing options...
Redbeard Posted March 26, 2023 Share Posted March 26, 2023 Is there access to the void above? If so, access it and search. If not, get the Stanley knife out. Explore. Link to comment Share on other sites More sharing options...
Alwayslearning22 Posted March 26, 2023 Author Share Posted March 26, 2023 40 minutes ago, Redbeard said: Is there access to the void above? If so, access it and search. If not, get the Stanley knife out. Explore. No there’s isn’t access. Any tips on finding out where the leaks coming from? Are the wall to ceiling junctions a weak point? Link to comment Share on other sites More sharing options...
Roundtuit Posted March 26, 2023 Share Posted March 26, 2023 Maybe remove smoke alarm, seal hole around cable with suitable sealant, replace smoke alarm ? Link to comment Share on other sites More sharing options...
Dave Jones Posted March 27, 2023 Share Posted March 27, 2023 a cold roof SHOULD have lots of air flow this is correct. As mentioned just seal the cable hole with 330. Link to comment Share on other sites More sharing options...
ProDave Posted March 27, 2023 Share Posted March 27, 2023 7 minutes ago, Dave Jones said: a cold roof SHOULD have lots of air flow this is correct. As mentioned just seal the cable hole with 330. Which is why I keep saying a cold roof is a really poor design and something like this if far far better designed from the outset as a warm roof and very little difference in cost. I hope one day people designing such buildings just might start to take notice and use a warm roof design by default. Link to comment Share on other sites More sharing options...
Dave Jones Posted March 27, 2023 Share Posted March 27, 2023 3 minutes ago, ProDave said: Which is why I keep saying a cold roof is a really poor design and something like this if far far better designed from the outset as a warm roof and very little difference in cost. I hope one day people designing such buildings just might start to take notice and use a warm roof design by default. The costs between the two are not small. But i agree warm is better but has more potential for problems if not done correctly which a cold roof doesn't. Link to comment Share on other sites More sharing options...
Alwayslearning22 Posted March 27, 2023 Author Share Posted March 27, 2023 54 minutes ago, Dave Jones said: a cold roof SHOULD have lots of air flow this is correct. As mentioned just seal the cable hole with 330. Shouldn’t there a vapour control layer to stop moisture rising and also prevent draughts? In an ideal world I suppose. Link to comment Share on other sites More sharing options...
Dave Jones Posted March 27, 2023 Share Posted March 27, 2023 nope. you dont want to trap moisture in the house unless you have something to remove it. a cold roof removes it. Link to comment Share on other sites More sharing options...
Alwayslearning22 Posted March 27, 2023 Author Share Posted March 27, 2023 3 hours ago, Dave Jones said: a cold roof SHOULD have lots of air flow this is correct. As mentioned just seal the cable hole with 330. What’s 330? Is that foam? Link to comment Share on other sites More sharing options...
Alwayslearning22 Posted March 27, 2023 Author Share Posted March 27, 2023 (edited) 3 hours ago, Dave Jones said: nope. you dont want to trap moisture in the house unless you have something to remove it. a cold roof removes it. My house is new and has ventilation system. Should that make a difference? I actually thought it was standard practice for a vapour control layer on Ceiling considering I have one on my external walls. Defeats the purpose of having one on the walls? Edited March 27, 2023 by Alwayslearning22 Link to comment Share on other sites More sharing options...
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