I'm currently trying to insulation the dwarf walls in our dormer bedrooms, the plasterboard is foil backed (no insulation behind) the studs are 100mm in depth & 380mm apart. I'd like to try and get at least 200mm of insulation behind them, would it be ok to add strips of wood say 4 x 2's to the existing studs and then fit the 200mm rockwool between?
Also would I need to add anything else once this was done to keep the stuff from slumping over time? My budget just doesnt stretch to semi rigid insulation and access is limited in height and width.
Also would I need to add anything else once this was done to keep the stuff from slumping over time? My budget just doesnt stretch to semi rigid insulation and access is limited in height and width.