Cavity wall / insulation question

Joined
2 Sep 2015
Messages
232
Reaction score
2
Country
United Kingdom
Are the tops of cavity walls (area in loft) supposed to be open or closed?

Should loft insulation run over a open cavity? Or should it be installed so it does not block the top of a cavity?

Thanks
 
Joined
11 Feb 2016
Messages
3,453
Reaction score
661
Location
monmouthshire
Country
United Kingdom
once it gets past the ceiling to the wall plate it wouldnt be insulating the house and if thicker than the depth of the rafters would be in contact with the felt/ membrane which could wick moisture into the insulation?
litl
 
Sponsored Links
Joined
2 Sep 2015
Messages
232
Reaction score
2
Country
United Kingdom
Thanks.

I had some one pop over to look at insulation the loft as currently I only have 100mm of Insullation up there. He is method would be to use a spray foam. He said he would spray the foam right into the corners of the loft space (which will mean coveting the top of the cavity). I take it this is a no no then?

Also would spray the membrane on underside of the roof.
 
Sponsored Links
Top