Thermal conductivity

The thermal conductivity of brickwork is dependent upon its density and moisture content but generally clay bricks are poor thermal insulators. Brick manufacturers quote thermal conductivities at a standard 5% moisture content for exposed brickwork, and may also give the 1% moisture content figure for protected brickwork.

Using bricks with an average thermal conductivity of 0.96 W/m K, a typical partially filled cavity system is:

102.5 mm fairfaced brickwork 50 mm clear cavity

50 mm foil-faced rigid polyurethane insulation (X = 0.023 W/m K)

100 mm lightweight blockwork (X = 0.15 W/m K) 12.5 mm plasterboard on dabs giving a U-value of 0.27 W/m2 K

The thermal conductivity of clay bricks at 5% moisture content typically ranges between 0.65 and 1.95 W/m K.

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