All the materials that are used in the construction of your home or business absorb and transfer Heat. 80% - 95 % of this heat is transferred, from the warmer side to the cooler side by one or more of the following ways.

1. CONDUCTION: Conduction is direct heat flow through matter (molecular motion). Heat is always conducted from warm to cold never from cold to warm.

2. CONVECTION is the transfer of heat within a gas or liquid.

3. RADIATION is the transmission of electromagnetic rays through space.

Take the R-value of the insulation and multiply it by the amount or thickness of the material. So insulation with an R-factor of 1.2 per cm which is 12.5 cm thick has an R-value of 15.

Reccomended Insulation Ratings

• Above Ceiling (R3.4)
• Under roof with reflective airspace (R2.7)
• Under roof no/little reflective airspace (R2.5)
• Wall - brick/veneer (R1.8)
• Under floor (R1.8)

Note that the R-value of some common insulation materials actually reduce when the temperature falls.