low pitch roof on kitchen extension

22 Mar 2013
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United Kingdom
Hi folks, need some advice please.

Have a kitchen extension that was built 2.5 years ago. Due to bad weather I have had a build up of water pools in one corner of the velux window, a 4m span across where the roof meets the vertical wall, and a random spot in the middle.

On inspection the roof pitch is not the 18 degree BUT 10-11 degrees, and simple tyvec membrane and large marley modern tiles. This was signed off by Building Control.

What are my options in terms of: Are Building Control at fault or partial blame for the issue? If so can they be liable to foot some of the cost of a repair?

Also what repair would you suggest on a roof this bad? I was thinking a specialist tile like Decra and a better membrane, is this the only answer? I dont think I can raise the pitch to 15 degrees without going above the level of the upstairs windows which could be expensive.

Would love some advice please.... :)
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I could do but it wouldn't help, were 2.5 years on from it being built and the contractor cannot be contacted, surprise.

This is why I'm looking for a solution rather than pointing the finger. :)
Well pointing the finger at building control will get you no where, I think you would be better off putting a membrane down on a pitch like that.
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I know in reality than I'll get nothing from BC but I find it remarkable that they couldn't see a 10 degree pitch??

Any clues to which membrane to use?
Is the cheapest solution to keep the tiles and fit a Klober Permo Extreme RS SK2 Vapour Permeable Roof Membrane?
10 degrees is practically flat, especially in terms of the Velux. This could be your weak spot as far as water ingress is concerned.
The designer wants flogging.

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