I am fitting 50mm of rockwool between my rafters (leaving a 45mm air gap between the felt for ventilation). This will leave it flush against the rafters and I will then add another 50mm across the entire roof for a total of 100mm.
At present, I have fluorescent tube light fittings screwed to a length of wood which is then screwed to the rafters. Once I have installed the insulation, this will need to sit on top of it. Should I just buy some 110mm+ screws and fix it back to the rafters through the insulation, or is there a better way?
At present, I have fluorescent tube light fittings screwed to a length of wood which is then screwed to the rafters. Once I have installed the insulation, this will need to sit on top of it. Should I just buy some 110mm+ screws and fix it back to the rafters through the insulation, or is there a better way?