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Alwayslearning22

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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. 
 

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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.

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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.

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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 by Alwayslearning22
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