Rockprime Blown Loft Insulation U Values

Pitched roof, between & over ceiling joists

Prescribed U Value W/m²K

 (England and Wales - Part L 2006) 0.16 extensions, renovation & repair work,
New build requirement could range between 0.13 and 0.12

 
 (Republic of Ireland-Technical Guidance Document 2006 edition) 0.16

(Scotland, with boiler SEDBUK-Part J) 0.16

Tiled pitched roof, 100mm Rockprime Blown loft insulation between joists (with the additional thickness of Rockwool Blown loft insulation over joists)

U Value     W/m2K	Thickness mm
0.25	170
0.20	215
0.16	270
0.14	325
0.12	355

U-values based on 6.8% bridging. 35mm x 100 trusses @ 600 ctrs.