1.3 Energy Efficiency As is the case for all external lightweight cladding, Weathertex plays a small part in the thermal calculations. The following thermal rating examples are achieved using Weathertex standard systems with R2.0-R2.5 rated insulation. Higher R values can be achieved by using higher rated insulation, e.g. R2.7.
WALL CONFIGURATION
RT (m2.K/W)
EXTERNAL LINING
FRAME
INTERNAL LINING
WINTER
SUMMER
Vapour Permeable Membrane Weathertex Cladding
90x45mm Timber Frame @ 600mm Centres R2.0 Batts
10mm Plasterboard
2.09
1.95
Vapour Permeable Membrane Weathertex Cladding
70x35mm Timber Frame @ 450mm Centres R2.0 Batts
10mm Plasterboard
1.98
1.89
Vapour Permeable Membrane 20mm Timber Cavity Batten Weathertex Cladding
90x45mm Timber Frame @ 600mm Centres R2.0 Batts
10mm Plasterboard
2.29
2.13
Vapour Permeable Membrane 20mm Timber Cavity Batten Weathertex Cladding
70x35mm Timber Frame @ 450mm Centres R2.0 Batts
10mm Plasterboard
2.20
2.09
Vapour Permeable Membrane 12mm Polystrene Thermal Break Weathertex Cladding
70x35mm Steel Frame @ 450mm Centres R2.0 Batts
10mm Plasterboard
1.74
1.68
Vapour Permeable Membrane 35mm Structural Timber Batten Weathertex Cladding
70x35mm Steel Frame @ 450mm Centres R2.0 Batts
10mm Plasterboard
1.93
1.84
16mm Fire Rated Plasterboard Vapour Permeable Membrane Weathertex Cladding
90x45mm Timber Frame @ 600mm Centres R2.5 Batts
10mm Plasterboard
2.73
2.59
Weathertex
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