Damp patches under window (Ed.)

[paulfabs]

Hi.

About 4 years ago had a loft conversion, a hip roof converted to a gable end. In the new gable end we had a window installed. Every winter we have had problems with damp patches. The window company have removed and reinstalled the same window twice, but we're still having issues. I have now removed the damp patches of plaster/plasterboard. Upon removal I can see the existing timber wall plate, then a bed of mortar, then another new 4x2 timber, then new 210x100 blockwork built on top of this new 4x2 timber. Sorry its a bit long winded, but is it normal to still have the timbers in the new gable wall.

Any information/advice would be greatly appreciated

 

[Bonni]

It means water is transmitting from the outer leaf to the inner leaf. These are possible causes -

1 - None or perished cavity tray above window lintel

2 - Full cavity insulation

3 - None or poor installed DPC around window

4 - Wall ties angled towards inner leaf and/or covered in mortar

5 - Something bridging the cavity ie.. piece of broken brick

 

[paulfabs]

Hi Bonni.Thanks for the help.

The wall is solid, the blocks have been laid flat.
Don't think there is any DPC just expanding foam and silicone sealant.
Think the lintels are concrete ones.