Dalek

I need to replace my loft insulation, basicaly its's really old and missing in places... and all my heat is flying out of the roof ! I was over at my mums house the other night and popped up her loft to see what the council had fitted recently (new insulation). I was amazed to see about 10 inches of insulation ! Way about the hight of the roof joists.

The question / problem i have is this...

I want to replace my insulation but i also want to floor the loft after i have done this to store junk etc up there like everybody else.. lol

Would it reduce the efficency of the thick loft insulation if it was squished down when i floor it, it will end up being squished from 10 inches to about 2 inches ! Or is there some super dooper thinner but just as efficient loft insulation available, not that silver foil stuff, i've heard bad things about condensation problems with that.

Anybody help ?

Cheers
Craig

Alps Pacino

Yo can get it in bags now, a LOT less itchie and supposed to be just as good

percybigun

yes it does reduce the efficiency if you squash it down into the ceiling joist zone and board over it.

you can buy much denser thin insulation products in polysterene such as Kingspan and Celotex. kingspan isnt too pricey, but celotex is quite expensive but has amazing thermal properties.

or some people batten above the existing ceiling joists to be able to put more insulation in, but this is adding more work.

you will get condensation with ANY type of loft insulation if the roof isnt ventilated at eaves and ridge. i have a new house with 10 inches of fibreglass insulation quilt and within a few months the loft was full of condensation because the builder hadnt put ridge vents in.

once they put the vents in, its been fine ever since.