Leak in bay window roof - internal

[TheSpid]

Okay - so it's been a bit rainy and we have a leak, we had a leak previously but thought we had fixed it by sealing the flashing on the outside - however, it appears this was not the problem.

The leak is in the bay window ceiling - coming to the main beaming dripping down. It's soaking the lime plaster which is doing its job and just being wet and will dry out again. The ceiling of this window area on the inside is very probably concrete and put in when the window was widened in the seventies. It is coated in artex. Outside the house is thinly rendered in concrete - in some places they haven't rendered at all - don't think it is lime mortared underneath but know knows, and then painted with Sandtex, obviously not good and there are plans for it to come off. We cant see where the water is getting in but it is. The guttering is sound and not blocked, it doesn't over flow when it rains and there is no evidence of leaks in the upper story. We chipped a small bit of render off above the window and it is wet under there and there is a 'gully' running behind the fibreglass, pretending to be lead, cill - it was this we sealed previously as it was loose. Pics follow
the main drip

the wet plaster on the left and the window shape

outside

the chipped off area with 'gully' behind

the ceiling in the bay

I have contacted a local builders, but in the meantime anyone got any bright ideas?

 

[a twig]

Do you have a window above that doesn't have a rain drip?

Had that problem here, spent ages looking for a leak in a window and the leak was actually around the window ledge above, where there was no rain drip on the cill, so it was tracking down inside the wall (behind the partially blown masonry paint that was still there at the time) and only coming out in the lower window...

 

[a twig]

Also from the close up image I'm not sure the grey sealant is actually achieving anything much as it seems to just sit on top of bits of "wall" in places rather than sealing the cut into which the flashing sits ...

 

[TheSpid]

Do you have a window above that doesn't have a rain drip?

Had that problem here, spent ages looking for a leak in a window and the leak was actually around the window ledge above, where there was no rain drip on the cill, so it was tracking down inside the wall (behind the partially blown masonry paint that was still there at the time) and only coming out in the lower window...

Hmm, hadn't thought of that will have a check - there is a window above.

Will also get hubby to check his grey stuff and make sure it is sited properly.

 

[88v8]

What was the sealant - Lead mate?
It's quite good, but....

That tray thing atop the bay should extend up and be turned into the wall. But It just seems to have a small vertical ... ?
Or one could let a lead flashing into the wall above, and turn it down on to the tray. Needs to extend a few inches to the sides.

Once water starts to leak in, it sets up a wick path and will just keep running. Only needs a very small seep to get it started.

Can be hard to trace leaks. When the north wind blows, as two days ago, we get water coming in through the timber framing above the kitchen window. I know for a fact that I've stopped up all the cracks so it can't leak. But it did.
Sigh.

Ivor

 

[TheSpid]

What was the sealant - Lead mate?
It's quite good, but....

That tray thing atop the bay should extend up and be turned into the wall. But It just seems to have a small vertical ... ?
Or one could let a lead flashing into the wall above, and turn it down on to the tray. Needs to extend a few inches to the sides.

Once water starts to leak in, it sets up a wick path and will just keep running. Only needs a very small seep to get it started.

Can be hard to trace leaks. When the north wind blows, as two days ago, we get water coming in through the timber framing above the kitchen window. I know for a fact that I've stopped up all the cracks so it can't leak. But it did.
Sigh.

Ivor

Yes the sealant is lead mate - Thad seemed to have done the trick until this week. And now hubby has created bigger hole with his 'investigations' I didnt know he was going to do.