I want to convert the part of the garage that is integral to the house to a utility room. It is currently a double garage and a quarter of it is under the main house. There is a pillar in the middle supporting the corner of the house so it is a matter of separating it off by filling in two gaps.
The idea is two layers of plasterboard (outer, fire retardant & sealed), then a layer of plywood for mechanical protection on the garage side. I am looking for guidance on the gap for insulation between the two layers of plasterboard.
If I look at celotex xr4000, it quotes a conductivity of 0.022, which for 75mm thickness, converts to 0.29, better than the required 0.35. Is this the correct maths? The boards will obviously add a bit more but studding will take some away.
The idea is two layers of plasterboard (outer, fire retardant & sealed), then a layer of plywood for mechanical protection on the garage side. I am looking for guidance on the gap for insulation between the two layers of plasterboard.
If I look at celotex xr4000, it quotes a conductivity of 0.022, which for 75mm thickness, converts to 0.29, better than the required 0.35. Is this the correct maths? The boards will obviously add a bit more but studding will take some away.