Terms to Know when Discussing Insulation

R Value is technically the resistance value of insulation to heat flow from one side to the other.  So the higher the R Value the harder it is for heat to move from one side to the other

Moisture barrier refers to material used to reduce corrosion on the surface of a material

Refers to the resistance of a material to the passing of water vapor particles 

Refers to a material used to prevent water vapor from one side to the other

Refers to a material used to prevent water vapor from one side to the other

Used to reduce summer heat gain and reduce cooling costs. The barriers consist of a highly reflective material that reflects radiant heat rather than absorbing it. They don't, however, reduce heat conduction like thermal insulation materials. 

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