Folks,
Any opinions welcome. TF erection just commenced this week, so focus now switching to insulation. Was looking at 100mm rigid between rafters with insulation backed plasterboard fitted beneath. This is quite pricey however, so I was wondering about the virtures of fitting sheets of 25mm rigid insulation beneath the rafters (tacked to rafters) & then fitting plasterboard over these. Works out much cheaper than the CPB but I appreciate there is extra labour (fitting twice instead of once). That issue aside though, is there likely to be any marked difference in performance if there is a good snug fit between plasterboard and insulation? Thanks in advance, apple1
Any opinions welcome. TF erection just commenced this week, so focus now switching to insulation. Was looking at 100mm rigid between rafters with insulation backed plasterboard fitted beneath. This is quite pricey however, so I was wondering about the virtures of fitting sheets of 25mm rigid insulation beneath the rafters (tacked to rafters) & then fitting plasterboard over these. Works out much cheaper than the CPB but I appreciate there is extra labour (fitting twice instead of once). That issue aside though, is there likely to be any marked difference in performance if there is a good snug fit between plasterboard and insulation? Thanks in advance, apple1