Water stained ceiling

Joined
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We have an enormous water stain on our kitchen ceiling. Our builder told us that it was caused either by faulty, old rendering and/or worn pointing on the upstairs windowsill which is build of bricks. Builder came 5 days after the agreed date and of course with the torrential rain we had the problem become quite desperate. The stain is very light brown, the edges are a lot darker and the stain is increasing but very slowly; about 1/2 inch per day. Am I right in thinking that it will take months for the ceiling to dry out? Thanks in advance for any answers.
 
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just a thought.

stand under it with a bucket and poke a small screwdriver through
 
elisa - what's above the kitchen ceiling? - bathroom (leaking bath waste) flat roof (damaged roof covering), another flat (careless neighbour or leaks), loft space with water tank & ineffective ball-valve overflow, dripping water pipe. Does the problem only occur/get worse when it rains? - knackered pointing, poor window frame sealant, the reasons your builder gave, rusted cast iron downpipe (these rust on the back edge because of lack of paint and very small holes can appear allowing very fine jets of water to be directed at the brickwork). Because you say the patch is on the ceiling, and not any wall, my money would be on a water leak in the room above. Anyway, before you spend loads of money with your builder discount the leaking waste/water pipe.

Assume you've been able to stop the cause of the dampness, allow the area to dry-out, apply stain block treatment (a special type of paint) before you re-decorate; if you don't apply stain block the staining will always re-appear through you new decorations.
 
do you need to remove some of the ceiling to check for fungal decay to any concealed timbers?????

it's a rhetorical question. yes you do.
 
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Thanks for your replies. Yesterday morning we found a stain round the light fitting in kitchen. Turned the elec. off, it dripped for about 2 minutes and then more or less stopped. I took the bathroom floor up (lino on nailed down plywood) but found nothing. I finally found the leak in the upstairs toilet. The water feed pipe into the cistern was leaking; the water got under the old cork tiles. Took the floor up (c.t. glued onto hardboard) and not a pretty sight. The smell was disgusting. The inlet pipe was replaced about 2 years ago by some plumbers (working during the week for BG) who moved our c.h. boiler from an inside to an outside wall in the bathroom. The replaced pipe was a bendy metal one; it wasn't only leaking at the joint but water sprayed out from the sides. Hopefully this is the end of the story apart from drying out etc.
 
If the ceiling does need re plastering a cost of undercoat usually kills the stain then finish with emulsion.

Pete
 
elisa - just as well you didn't get the builder in to re-point the walls & repair the render ... loads of money spent and still a continued dampness. Just shows what getting a bit of advice here can avoid. Anyway, good news that you found the cause.
 

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