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only three, four or five for each inch of thickness — so to reach higher Rvalues, it may be necessary to install several thicknesses of insulation or denser amounts.
All insulation must have a moisture-vapor barrier to protect it from moisture in the home. However, in adding insulation to a place already insulated, you don’t need to put in another barrier.
Insulation works because air spaces in it actually slow down the flow of heat through the insulation. It is im jortant to keep air spaces free from moisture or they cannot do their job.
Some insulation already has a moisture-vapor barrier attached to it. For other insulation, the homeowner can use four or six mil thick polyethylene sheeting as a moisturevapor barrier. Foil-backed gypsum board also makes an effective, moisture vapor barrier, but its joints must be taped to give a solid barrier. Always put the vapor barrier on the warm side of the insulation.
Insulation types used most often are mineral wool, cellulose and rigid foam.
Mineral wool (fiber glass or rock
93.2%