Insulating single brick walls.

[sian3603]

I have a 2 bedroom semi detached house that has a single brick extension/utility room. At the minute it's used as a utility/store room, with the washing machine, tumble dryer and all sorts of other stuff that never gets used in there!
I want to convert it into a 3rd bedroom and was wandering how to insulate the walls and roof as it's only single brick. I'm not sure what the roof is, it's flat and has a felt outer covering.
It measures approx 8' high, 15' wide, 25' long. (The house is rented out and I live in a differant area, hence approx dimensions)
Any advice would be greatful please.
Thanks.

[stoneyboy]

sian3603,
Roof - remove existing ceiling, add insulation leaving an air gap above, fit permanent ventilation for the gap, fit a new ceiling.
Walls - preferably fit insulation to the outside and then render/clad as required, this may need Planning Permission.
end

[sam0010]

Hi Sian 3603,

I work for Kingspan Direct. Another alternative to the wall insulation if you are wanting to insulate internally would be to use an insulated plasterboard fixed to a 25mm treated timber batten. Our recommendation is the Kooltherm K18 insulated plasterboard for solid walls. Other manufacturers may have some alternative options available for you as well.