Dormer bedroom - insulation options

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gabbo

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Hi

I'm getting pumped cavity wall insulation for the house.

However, I have a large dormer structure coming out of the sloped roof, that is timber frame and flat roofed. When a builder was doing some work some time ago for us, he knocked off some plaster and said "there is no insulation in here at all".

The room is draft free, but gets very hot in the summer (sth facing), but very cold in the winter when the heat goes off.

I don't have a lot to insulate, the south facing wall - 22 ft long x 8 ft high (but with two massive windows that are 60% of the area) and the two sloped walls either side, that join on the sloped roof.

Can someone tell me what options I have please? Preferably, I'd rather not lose any ceiling height, but will do if that's the most reasonably priced option....
 
whats the depth of rafter? what the area were taking about? and whats the roof build-up inside to outside? as in plasterboard, VB, rafter, plywood, membrane?

the 60% windows will have something to do with this heat loss also!
 
lowCO2design said:
whats the depth of rafter? what the area were taking about? and whats the roof build-up inside to outside? as in plasterboard, VB, rafter, plywood, membrane?

the 60% windows will have something to do with this heat loss also!
Click to expand...


Hi,

I think it's a standard (os that about 60cm), but that's based on an outside visual, haven't taken back plasterboard. Ideally I'd like to rock wool this, but need to leave gap for air right?

Felt roof. Roof is plasterboard, timber, membrane, felt (inside to out).

Area is 22ft x 8 ft (two small bedroom, onw structure).

New windows (2006) double glazed.
 
gabbo said:
Hi,

I think it's a standard (os that about 60cm), but that's based on an outside visual, haven't taken back plasterboard. Ideally I'd like to rock wool this, but need to leave gap for air right?

Felt roof. Roof is plasterboard, timber, membrane, felt (inside to out).

Area is 22ft x 8 ft (two small bedroom, onw structure).

New windows (2006) double glazed.
Click to expand...
os ? 60cm is what exactly? why not take down a small section of plasterboard
is there gaps at the eaves? and ridge for ventilation?
rockwool would be good and yes by the sounds of it ventilation is required, maybe some proprietary vent trays would be best.
 
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