Rockwool Cavity U Values performance

Brick/block

102mm Facing brick outer skin, Rockwool EnergySaver full fill, internal concrete block 100mm.
Internal finishes: (a) plaster (b) plasterboard on dabs

Internal Block block λ	1900  -2250 kg/m3 Dense 1.1130  W/mK		1400 -1450 kg/m3 Med/Light 0.510 W/mK		750 kg/m3 Aircrete 7N 0.190  W/mK		600 kg/m3 Aircrete 0.190 W/mK		470 kg/m3 Aircrete 0.110 W/mK
Internal finish	a	b	a	b	a	b	a	b	a	b
Insulation Thickness mm
50	0.59	0.54	0.55	0.51	0.49	0.46	0.48	0.45	0.45	0.42
65	0.47	0.45	0.45	0.43	0.40	0.39	0.39	0.37	0.36	0.35
80	0.40	0.38	0.38	0.37	0.35	0.33	0.34	0.33	0.32	0.31
90	0.35	0.34	0.34	0.32	0.31	0.30	0.30	0.29	0.29	0.28
100	0.33	0.32	0.32	0.31	0.30	0.29	0.29	0.28	0.27	0.27
110	0.31	0.30	0.30	0.29	0.28	0.27	0.27	0.26	0.26	0.25
120	0.28	0.28	0.28	0.27	0.26	0.25	0.25	0.24	0.24	0.23

Block/block

Render, medium dense block outer skin, Rockwool EnergySaver blown full fill, internal concrete block (100mm).

Internal finishes: (a) plaster (b) plasterboard on dabs

 U value calculations are based on BS EN ISO 6946 (combined method) using S/steel ties.

Aircrete blocks

Render, 100mm Aircrete 7N block outer skin (0.190 W/mK), Rockwool Cavity ful fill, 100mm Aircrete 7N block innner skin (0.190 W/mK).

Internal finishes: (a) plaster (b) plasterboard on dabs

Internal Block block λ	750kg/m3 Aircrete
Internal finish	a	b
Insulation Thickness mm
65	0.35	0.34
80	0.31	0.30
90	0.29	0.28
100	0.27	0.26
110	0.25	0.24
120	0.23	0.23

 U value calculations are based on BS EN ISO 6946 (combined method) using S/steel ties.