Damp in bedroom ceiling from flashing on chimney stack.

Benny_the_ball-valve · 18 Nov 2012

Sorry, I have been away for a couple of days. I will try to carry out catlad’s test with a rag as soon as I can get up there.

Yorkie, where is the soleplate? Is it the flat piece at the back that sits under the tiles with the (short) upstand?

If, as Yorkie says, we require some pretty definitive work to the stack is anybody able to give me some idea as to what this would be likely to cost? We are in London. Thanks, guys.

yorkie1969 · 18 Nov 2012

Benny_the_ball-valve said:
Sorry, I have been away for a couple of days. I will try to carry out catlad’s test with a rag as soon as I can get up there.

Yorkie, where is the soleplate? Is it the flat piece at the back that sits under the tiles with the (short) upstand?

If, as Yorkie says, we require some pretty definitive work to the stack is anybody able to give me some idea as to what this would be likely to cost? We are in London. Thanks, guys.

This is what a backgutter should look like Benny:

http://www.roofline.org.uk/BLM/diagram_back_gutter_fixed.jpg

catlad · 18 Nov 2012

While you are up there check the tiles above were the water runs onto the lead behind the chimney as the plastic membrane only seems to go half way across.

Benny_the_ball-valve · 18 Nov 2012

Thanks a lot for the link, Yorkie, very useful.

catlad said:
While you are up there check the tiles above were the water runs onto the lead behind the chimney as the plastic membrane only seems to go half way across.

I asked about this earlier, catlad.

Benny_the_ball-valve said:
...I am a bit uncertain as to what the purpose of that piece of plastic covering is for - perhaps it is masking some other point where water could enter? Anything look a bit iffy?

datarebal said:
.. the plastic is a piece of roof underlay..

I have done catlad’s water test and taken a few more snaps. There certainly does not seem to be a split in the lead where the water might seep through, but the mortar that holds the rear apron does seem a little too flexible so I suppose this could be the failure point.

Nige F · 18 Nov 2012

Water could be getting in that sloping brickwork behind the cover flashing over the "wrong" back gutter . I`d fit a wide backgutter and clad the slope with lead while I was @ it - not a bad little job off a decent tower scaffold

Benny_the_ball-valve · 18 Nov 2012

Nige F said:
Water could be getting in that sloping brickwork behind the cover flashing over the "wrong" back gutter . I`d fit a wide backgutter and clad the slope with lead while I was @ it - not a bad little job off a decent tower scaffold

Thanks, Nige. Would you have any idea what sort of costs would be on the agenda, here?

Nige F · 19 Nov 2012

Have a look @ www.leadcontractorsassociation.com they work with the leadsheet association so you should get a qualified contractor there . (The materials are going to be c.£200 without the valley .) That`s been suggested before - and I`m convinced it`s the way to go .

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Damp in bedroom ceiling from flashing on chimney stack.

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