James Perrett wrote:jmch wrote:What will the exterior roof need to be? My budget definitely won't stretch to a concrete roof. James, if I tile the exterior roof and put acoustic plaster board under the rafters, with a gap before the interior double board ceiling:
- will that be enough mass to match the block walls?
- won't there be another air gap between the board under the rafters and the tiled roof (the 3 leaf set up?)
That roof construction is exactly what I have here - using fairly substantial tiles. It won't quite match the block walls but on mine there's a bigger air gap between the layers which helps. The larger air gap also reduces the effect of the 3 leaves and, most importantly in my case, allows for thick roof joists to ensure that the inner ceiling wouldn't bend too much if I found that I had to use 3 layers of heavy plasterboard.
James, I'm going to copy your roof set up. Is the void of your roof ventilated? Does it need to be?
James Perrett wrote:jmch wrote:Also, on the exterior block walls, my builder is talking about putting batons on the outside of the block, and putting the timber cladding on them. Will the gap between the block and the cladding matter? Should I insulate that?
My biggest worry would be the outer cladding resonating with the vibrations coming through the wall and therefore radiating more noise to the outside world than the wall alone. I'd suggest some kind of damping material behind the cladding although I'm not sure exactly what material to suggest as you also need air circulation behind the cladding to prevent damp patches.
It looks like we're going to seal and paint the exterior block wall rather than clad it. Although it won't look the prettiest, I guess that takes away the risk of resonance. What do you think?