Insulation/vetilation of a very small area!
Information, help, tips and advice on cavity walls, ceilings and lofts etc....

DIY4rob
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Insulation/vetilation of a very small area!

by DIY4rob » Fri Nov 08, 2024 4:28 pm

Just had the glazing done.... the small strip above the new glazing (bay c.8''x9') is a very thin wall to outside
1st; pvcu foamboard that is attached to framing above the window
2nd; next 4'' gap,
3rd; lathe/render
The interior wall above the window is close to it so I am making a 3'' projection into the room so I can screw blinds up under it and will insulate this to plug the significant thermal bridge.

Q. I am therefore making an sealed box almost next to the outside. Can I simply fill it with foam (inc expanding to take in every gap) or will moisture problems result? Do I need to make some sort of vent to the 'box'.
Thanks!

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