Help with roof

[Cubist]

Theres a lot of lead flashing on that roof and wall. Can you be more specific please about where you are seeing water appear indoors?

 

[Jblakes]

The bottom of the valley (red circle) seems to be coming under the flat roof. Then the oval red circle we are getting water that seems to be dripping through the mortar on the wall.

 

[Jblakes]

This is the mess the flashing is hiding

 

[Lacan07]

This looks very much like a Dutch product called Flexim, it comes in different colours but this could be the black version. Its designed as a flexible alternative for mortar used in securing ridge tiles, hips, valleys, etc. The outer skin seals but it never truly goes hard, its like a waterproof linseed putty. I've used it a few times for sealing the edges of holes made by running service pipes. From understanding its a quality product.

 

[Jblakes]

Honestly no idea what it is. I've had lead flashing put over the top as I thought the water was getting in some how. Still not sorted it though

 

[Cubist]

Strikes me that the area @Lacan07 highlighted above is the prime culprit and needs some careful attention. After that I would also be looking closely at the render coating of that wall to see of there were cracks or other fissures that may be allowing water ingress.

 

[Jblakes]

Yeah I thought that was the issue. But I've had lead flashing put over the top, which to me would have sorted it.

 

[Stevers]

The paint spalling off the wall like that suggests to me that the wall above is very damp. Is it a render that could absorb and then release moisture, or one that is more likely to transmit water into the fabric?

Running the flashing over the tiles is essential for pantiles, whilst plain tiles (or slates) would conventionally have individual soakers under the tiles, and perhaps there's a good reason for that.

 

[stuart45]

Running the flashing over the tiles is essential for pantiles, whilst plain tiles (or slates) would conventionally have individual soakers under the tiles, and perhaps there's a good reason for that.

There's a good reason for dressing the flashing over the profiles of single lap tiles like pantiles or double romans, because you can't use soakers with them. However in recent years secret gutter systems have been developed for them as an extra protection.
On double lap tiles and slates, you would normally use soakers which stop any moisture, and the cover flashing should protect the top of the soakers and not be dressed over the tiles or slates.

 

[Jblakes]

Gone slightly over my head. Are you saying that lead flashing isn't right?

As for the flaky stuff on the wall, it's next doors and they have taken alot of cement stuff of other sections of the wall, so would guess it's some sort of sand and cement stuff.

 

[stuart45]

Gone slightly over my head. Are you saying that lead flashing isn't right?

As for the flaky stuff on the wall, it's next doors and they have taken alot of cement stuff of other sections of the wall, so would guess it's some sort of sand and cement stuff.

The flashing is not the way it's normally done on double lap tiles. It shouldn't be an issue as long as you have soakers against the wall.

 

[Jblakes]

Sorry to sound daft but why would you need soakers underneath, when water shouldn't get there as there is flashing on the top?

 

[stuart45]

With flat tiles or slates you can't dress the lead to form a complete seal, and water driven by the wind can find it's way in. With a profiled tile it's much easier, although nowadays a secret gutter is often used as a secondary defence.

 

[a twig]

Where our recent single storey extension met the wall it was detailed with soakers initially and then when the roof was finished lead flashing over the top - bit belt and braces but been dry as a bone since.

 

[Stevers]

The bottom of the valley (red circle) seems to be coming under the flat roof. Then the oval red circle we are getting water that seems to be dripping through the mortar on the wall.

Generally it's reasonable to be sceptical of the ability of 'stick on' fixes to correct problems with poor detailing. In this case it looks like a flat roof extension has led to what may have been an ill-conceived change to a plain tiled eave with every chance of it not working as hoped without a bit of luck. What's to stop water running off the end of that funny little ledge into the building? The new flashing seems unlikely to be able to do that.

There's a leak on my french windows when the wind blows, and it's purely because they (like almost all doors) open inwards. Is the problem worse when the wind blows? Is this area exposed to the prevailing weather making any poor detailing more problematic?

 

[Jblakes]

I would say yes heavy rain or windy seems to increas the problem. Got a roofer coming round to peel back the lead and install soakers, plug seal the big crack in the wall. That should make that water tight and see how It goes.

That edge you speak about, I assume you mean in the red circle. That currently has flashing over it which is to have soakers added. This is the same place.



He is also going to add eaves protcwto the bottom tiles incase rain is being blown backwards into the house