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Rockfall Sytems - U Values
Ventilated pitched roof - between rafters
Prescribed U Value W/m2K
(England and Wales)
Extensions, Renovation & Repair work: 0.20
New build requirement could range between 0.16 and 0.14
(Republic of Ireland) 0.20
(Scotland, with boiler SEDBUK) 0.20
| Rafter width (x depth of underlay)
Spacing of rafters
Timber bridging
Insulation Insulation
Over rafter Between rafters
Thickness mm | 38
400mm
9.5 %
| 38
600mm
6.3%
| 47
400mm
11.7%
| 47
600mm
7.8% | 40 150 | 0.21 | 0.20 | 0.22 | 0.20 | 40 200 | 0.17 | 0.16 | 0.18 | 0.16 | 50 150 | 0.20 | 0.19 | 0.20 | 0.19 | 50 200 | 0.16 | 0.15 | 0.17 | 0.16 | 60 200 | 0.15 | 0.15 | 0.16 | 0.15 | 70 120 | 0.21 | 0.20 | 0.21 | 0.20 | 70 150 | 0.18 | 0.17 | 0.17 | 0.18 | 70 200 | 0.15 | 0.14 | 0.14 | 0.15 | 80 120 | 0.19 | 0.19 | 0.20 | 0.19 | 80 150 | 0.17 | 0.17 | 0.18 | 0.17 | 80 220 | 0.13 | 0.13 | 0.13 | 0.13 |
Construction: The Rockfall system is totally fire safe, minimises thermal bridging & provides an effective acoustic barrier against external noise pollution. The system comprises of a high density Rockwool Overlay board mechanically fixed over the rafters and a lighter density Rockwool Underlay board fitted between rafters. An air tight VCL membrane is stapled to the underside of the rafters finished with 12.5mm plasterboard.
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Rockwool Limited, Pencoed, Bridgend, CF35 6NY, UK
| 01656 862621 |
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