Damp patch new window, new extension Advice needed

[^woody^]

Still unsure how roof water can get under the lintel due to the triangle shape

Via a lack of a cavity tray

 

[grumpydad]

Via a lack of a cavity tray

There is a cavity tray and weep holes

 

[Swwils]

Your windows are fit far to far forward in the reveals, unless you have insulated reveals.

 

[grumpydad]

They seem to be set 10mm in

 

[Swwils]

So your internal regular plasterboard is attached directly to the outer leaf?

 

[grumpydad]

Not sure what the outer leaf is pal, I assume the do up the window frame

 

[grumpydad]

I think the plasterboard touché the window frame

 

[23vc]

I reckon Roof leak further up, potentially velux flashings, getting through the membrane, running down the rafters, hitting the wall plate and dripping down and onto the reveal. Does the damp patch correspond to one of the velux sides?

 

[^woody^]

There is a cavity tray and weep holes

Right the options are water getting down the cavity, or across between the lintel and frame head.

If you are confident that the roof and tray are correctly done, then only leaves one possibility left to investigate.

 

[23vc]

or across between the lintel and frame head.
.

did think that, is that silicone sound? Could possibly be some capillary action and no drip edge on lintel. Then again that bit isn’t really exposed

 

[grumpydad]

ive been a few weeks since we have been using the room and it seems to have stopped.