Dormer Leaking

[MidsTW]

This happened a few years ago but it disappeared.. until today. The rain is bad here today and driving towards the front of the house.

Our dormer is leaking again and I’m struggling to work out the source. Appears to be coming in at the corner of the window. I cut some of the wall away to get a better view. Looks like it could be coming from under the cill/frame junction.

Can’t see any gaps in the sealant and it only seems to leak during continuous heavy rain.

Any ideas??

First picture is showing the ‘main’ drip which is coming from the frame directly under the cill.

Second image zoomed out showing location of the slot below the cill which is where the first pictures is looking

 

[catlad]

An educated guess is that the face drain is not properly sealed, or the tiling in that corner is not properly detailed.

 

[MidsTW]

Thanks, I took away some of the cill.

 

[MidsTW]

Water is dripping onto this corner… suspect?

 

[MidsTW]

Think the culprit is the sealant above the window. It’s completely failed across 75% of the top of the frame. Explains why the leak is worse with driven rain on the front elevation.

Assume this is then running down one side (it won’t be installed level) and then soaking the wooden frame etc etc

Problem is now getting it fixed.

 

[datarebal]

No lead tray

 

[MidsTW]

No lead tray

Would this prevent the lack of sealing at the top of the frame from running down the side to the wooden framing?

 

[Alastairreid]

Would this prevent the lack of sealing at the top of the frame from running down the side to the wooden framing?

No! but it would stop the water getting in that did pass the frame.