I'm installing a new ceiling in a room that has been opened up to the full height of the roof (45 degree pitched roof). Architect's drawings show 100mm of celotex between rafters and then a continuous run of insulated plasterboard (65mm celotex) under the rafters.
This all seems fair enough to me.
To improve sound insulation though (and possibly to make the plasterboard installation easier) I was thinking of adding a layer of 11mm OSB below the rafters before adding the insulated plasterboard.
So, construction would be a sandwich of 100mm insulation, 11mm OSB, 65mm insulation and then a layer of plasterboard bonded to the 65mm insulation.
Does this sound daft/sensible/unnecessary?
Cheers,
ip
This all seems fair enough to me.
To improve sound insulation though (and possibly to make the plasterboard installation easier) I was thinking of adding a layer of 11mm OSB below the rafters before adding the insulated plasterboard.
So, construction would be a sandwich of 100mm insulation, 11mm OSB, 65mm insulation and then a layer of plasterboard bonded to the 65mm insulation.
Does this sound daft/sensible/unnecessary?
Cheers,
ip