Leak from the ceiling

[Lk1980]

Hello
I was wondering if someone can please help. After intense snow over last 2 days, I have just noticed a leak from the ceiling corner today. (Please see the photo attached)

On the other side of the wall plaster flaking. (This only happens during winter months)

For the plaster flaking, I think it's a thermal bridging.

It's the leak that I am now more worried.

The leak is by the side wall I think it's where the guttering is outside. Again these are just the theories. I am thinking to get the builder, but before I do that I was looking for some advice on this forum.

Thanks,
LK

 

[Wayners]

Looks more like condensation.
If you can get to the other side make sure there is insulation at that spot. Often the edges get missed as it takes effort to cut a narrow bit and shove behind joists

 

[Lk1980]

Hi Wayne's, thank you. The only way to check is to remove the coping stones from the parapet wall and look in between the outer and internal wall.

What about that water leak in the corner wall. Do you think it is condensation?

 

[23vc]

Parapet / coping stones rings alarm bells…

 

[Wayners]

Yeah.
Could be getting damp through.
Could also be from condensation.

If you cover with plastic. Any water on the plastic is condensation. Water under is a leak.
I've never tried this but I've seen it said as a test.
Normally a leak will spread. You get water stains and the surface rots and falls apart.
Condensation you get flaking and peeling. Mould.

 

[foxhole]

Parapet walls are often a source of leaks on a roof .

 

[Lk1980]

Thank you foxhole and Wayne, what is the ideal remedy to stop them

 

[noseall]

Thank you foxhole and Wayne, what is the ideal remedy to stop them

It's usually either a design issue or the builder didn't follow the design. Complete coverage of the uppermost parapet section and across the cavity, with the roof membrane material, can be a fix.

 

[Lk1980]

Hi I was wondering if Gorrilla Waterproof patch and liquid seal work?

 

[23vc]

Have you got access to it from outside? Would need to see pics..

 

[^woody^]

Is that a bathroom? Are you sure it's not condensation related?

 

[Lk1980]

Yes it is bathroom but not much used as its just a guest one downstairs. I ll take a pic from outside and re post

 

[accelerator]

It looks like a water leak to me, and is likely caused by a high volume of water coming off the roof because of melting snow.

I would be very surprised if it's condensation. If it appeared quickly and the area is all damp it's likely a roof leak.

 

[Lk1980]

I have taken the photos from the top and from the outside as requested. Few months ago, I had also rolled storm dry to prevent water coming in but dont know how effective it was now.

 

[accelerator]

I'm seeing a flat roof and thinking that it's probably leaking somewhere or your gutters are blocked and overflowing. These things are hard to diagnose over the internet, but as you are no doubt aware, flat roofs are notorious for leaks.