1st Insulation Partners

Thermal Performance – Cosytherm Rockwool

Cosytherm Rockwool Cavity Wall Insulation has a thermal conductivity of 0.039 W/mK.

Typical U-values (W/m2K) for masonry cavity walls insulated with Cosytherm Rockwool Cavity Wall Insulation

Cosytherm Rockwool Thickness (mm)	Brick outer leaf/cavity/100mm block inner leaf type:
	Dense block (λ=1.13)	Medium block (λ=0.51)	Lightweight Aggregate (λ=0.34)	Standard Aircrete (λ=0.16)	Lightweight Aircrete (λ=0.11)
100	0.32	0.31	0.30	0.28	0.27
85	0.36	0.35	0.34	0.32	0.30
75	0.40	0.38	0.37	0.35	0.33
65	0.45	0.43	0.41	0.38	0.36
50	0.54	0.51	0.49	0.45	0.42

Notes: The U-values have been calculated assuming that all walls are lined with plasterboard on dabs. Block sizes assumed to be 440 x 215mm, mortar joints assumed to be 10mm wide, wall ties assumed to be stainless steel with a cross-sectional area of 12.50mm2. The U-values have been calculated to BS EN ISO 6946: 1997.

Thermal Performance – Cosytherm Whitewool

Cosytherm Whitewool Cavity Wall Insulation has a thermal conductivity of 0.040 W/mK.

Typical U-values (W/m2K) for masonry cavity walls insulated with Cosytherm Whitewool Cavity Wall Insulation

Cosytherm Whitewool Thickness (mm)	Brick outer leaf/cavity/100mm block inner leaf type:
	Dense block (λ=1.13)	Medium block (λ=0.51)	Lightweight Aggregate (λ=0.34)	Standard Aircrete (λ=0.16)	Lightweight Aircrete (λ=0.11)
100	0.33	0.32	0.31	0.28	0.27
85	0.37	0.36	0.35	0.32	0.3
75	0.41	0.39	0.38	0.35	0.32
65	0.46	0.44	0.42	0.38	0.35
50	0.55	0.52	0.44	0.44	0.41

Notes: The U-values have been calculated assuming that all walls are lined with plasterboard on dabs. Block sizes assumed to be 440 x 215mm, mortar joints assumed to be 10mm wide, wall ties assumed to be stainless steel with a cross-sectional area of 12.50mm2. The U-values have been calculated to BS EN ISO 6946: 1997.

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