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PostPosted: Mon Dec 11, 2017 9:35 pm 
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Hi I've a wooden bay window installed about 5 years ago which now leaks underneath the bay in three places. The sides of the window are fixed, only the middle window moves.
I've had the roof above the bay replaced with new felt and lead.
I've had the render underneath the window knocked out and replaced.
I've also done the same down the side that faces the weather.
I've applied sealant around the glazing.
I've had a sash window fitter replace the beading and weatherproof the window. I've filled every crack and painted the external frame.
The gutter above the window is clear and drains away
It still leaks and it's getting worse.
Reluctant to take out as were expensive as made of hardwood.
Would welcome any advice. Have I missed something?

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PostPosted: Mon Dec 11, 2017 10:01 pm 
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Its difficult to diagnose bay leaks without photos of the roof, the full elevation, and external details of how the frame is sealant protected, and a photo looking up at the external sill projection.
There should be a drip throating underneath the sill.

Your photos wont expand & are cockeyed.


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PostPosted: Tue Dec 12, 2017 11:03 am 
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My thoughts are the same as Wes, has it gor a cill with a drip groove?


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PostPosted: Tue Dec 12, 2017 7:40 pm 
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Thanks to you both for the quick response.
I've attached a picture of the drip grove

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Also attached is a copy of the outside

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PostPosted: Thu Dec 14, 2017 10:48 am 
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Thanks for the Cill photo's which confirm an adequate anti-capillary groove.

There does appear to be to be some 'dark' areas where the render meets the underneath of the cill.
I feel that these should be raked out and points with cement mortar mixed at 3:1 Building Sand / Cement.
When 3 days dry, apply a bead of External silicone sealer right in the corner where the repaired render meets the Cill.

Davyp1


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PostPosted: Thu Dec 14, 2017 12:49 pm 
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Not related to the damp you've shown but I'd clear that small forest out of the guttering while you're at it.


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PostPosted: Thu Dec 14, 2017 9:33 pm 
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Thanks Davyp1 - the render was replaced last year but that happy to give the suggestion of a silicone sealer a try. A job for this Saturday, along with clearing out the gutter. Will keep you posted as to whether this works


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PostPosted: Mon Dec 18, 2017 8:53 pm 
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Hi All - rained yesterday and the wall is damp again. Open to any suggestions for what to do next.

Thanks


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