Cold Pitched Roofs

  Solutions to minimise
heat loss through
the roof

Prescribed U Value W/m2K

(England and Wales - Part L 2006)
Extensions, renovation & repair work 0.16,
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

 At ceiling joists  

       At rafter line 

 Rockwool Roll

 Blown Loft
 Insulation

 Rockfall Systems
(Warm roofs)

 Rockwool Flexi
(Attic conversion)

 Thickness (mm)
Width 1200mm
100, 150, 170 

 Thickness (mm)
Underlay board
(1140 x 600)
100, 120, 150

Overlay board
(2000 x 600) 
50, 60, 70, 80

 Thickness (mm)
(1200x600)
50, 60, 70, 90,
100, 120, 140

(1200x400)
50, 60, 100,
120, 140