which insulation batt rating to use
The R-values of plastic fiber insulation vary with the battâs density, ranging from R-3.8 per inch at 1.0 lb/ft 3 density to R-4.3 per inch at 3.0 lb/ft 3 density. Plastic fiber insulation is relatively non-irritating to work with, but the batts reportedly can be difficult to handle and cut with standard tools.