Water Stain on ceiling

Baggypuss

Good Morning Everyone

Few months ago, I had guttering professionals to install bridging strip to bridge gap bet roof and guttering to stop water from leaking via window frame in bathroom when raining. The professionals highlighted the fact that water might have been coming down top of render and behind it causing some areas of render to be hollow and hence leading to water entering window frame. After professionals left, I only just noticed water stains on ceiling where extension meets render wall (stain would've been growing for time). See photos above. First photo is after bridging strip installed. Stain seemed to have grown into the domain of main house. Water seemed to have stopped coming via window. Not sure whether bridging strip had stopped water stain from growing, difficult to tell.

Baggypuss

I will look into render in future, so hoping bridging strip will buy me some time.

Baggypuss

Properties on either side of my house do not have render

Bigphil1474

If the works have fixed the problem, give the ceiling time to dry out, then paint over the stains with a water stain product before using your normal ceiling paint. When we had a leak in our old house, I tried just painting over it and the stain kept showing through.

Baggypuss

Thanks for advice.

JohnB47

As regards the covering of the stains, you can get stain blocking products in ‘paint on‘ tins and aerosol cans.

I would recommend the ‘paint on’ type, even if you use a cheap brush and throw it away afterwards.

I used an aerosol type and even though I covered furniture etc. local to the spraying, the product created a cloud of particles that went far and wide. It created a white misted coat on items and furniture that was very difficult to remove, if not impossible. It’s still on the vinyl top of a piano stool, even though it’s been sat upon numerous times since.

Also, there was only just had enough in one can for the job.

So even though a spray can seems less hassle, a tin is a far better option.