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Retrofitting insulation to sloping roof on dormer window

Postby mizunooto » Sat Aug 23, 2014 8:44 am

I'm working my way through my dormer bungalow which was built without a shred of insulation in the 1960s. My biggest problem is the area of sloping roof/ceiling on either side of the dormer windows, i.e. from the (small and cramped) loft space down to the eaves above the ground floor. The property was re-roofed about 10-15 years ago (nobody thought to fit insulation!) So I have a number of "slots" to fill, each about 4 x 20 x 72 inches, and not sure the best method to use. I could try pushing celotex into the slots though it would have to be cut small to ensure I could push it all the way down. I thought of pouring chunky polystyrene loose-fill down the slots - it couldn't escape at the bottom and would still allow some air circulation - would this be sensible or not? Any ideas would be welcome.
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Simply Build It

Postby welsh brickie » Sat Aug 23, 2014 1:28 pm

its best to remove the plasterboard and insulate properly, doing it the way your suggesting wont work, use kingspan or celotex hardboard insulation
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