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Rockwool Energysaver U Values

External masonry cavity wall - full fill (blown/retrofit), brick/block

Prescribed U Value W/m2K

 (England and Wales) Extensions: 0.30
Renovation & Repair work: 0.35
New build requirement could range between 0.28 and 0.25

 (Republic of Ireland) 0.27

(Scotland, with boiler SEDBUK ) 0.30

U Values  (W/m2K)

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

Block density

Block type
block λ
1900-2250kg/m3 
Dense
1.1130 W/mK		 1400-
1450kg/m3
Med/Light
0.510
W/mK		 750kg/m3

Aircrete7N
0.190
 W/mK 		  600kg/m3

Aircrete
0.160
W/mK		 470kg/m3

Aircrete
0.110
W/mK		 
 Energysaver
thickness mm

a

 b

ab a b 

a 

 b

a

 b
 65

 0.47

 0.45   0.45  0.43  0.40  0.39  0.39  0.37  0.36  0.35
 70 0.45 0.43 0.43 0.41  0.39  0.37 0.38 0.36 0.35 0.34
 75 0.42 0.40  0.41  0.39 0.37 0.35 0.36 0.34 0.33 0.32
 80 0.40 0.38 0.38 0.37 0.35 0.33 0.34 0.33 0.32 0.31
 85 0.38 0.37  0.37  0.35 0.34 0.32 0.33 0.32  0.31  0.30
 90 0.36 0.35 0.35 0.34 0.32 0.31 0.31 0.30 0.29 0.28
 95 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
 105

 0.32

 0.31 0.31 0.30 0.28 0.28 0.28 0.27 0.27 0.26
 110

 0.31

 0.30 0.30 0.29 0.28 0.27 0.27 0.26 0.26 0.25
 115

 0.30

 0.29 0.29 0.28 0.27 0.26 0.26 0.25 0.25 0.24
 120

 0.28

 0.28 0.28 0.27 0.26 0.25 0.25 0.24 0.24 0.23
 125

 0.27

 0.26 0.27 0.26 0.25 0.24 0.24 0.24 0.23 0.23

 


 Construction: 102mm Facing brick outer skin, Rockwool EnergySaver full fill,
internal concrete block 100mm.

 

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