Stowlite
lightweight
concrete blocks 7.3N/mm2to BS EN 771-3
7.3N/mm2 (OVEN-DRY DENSITY approx 1400 kg/m3)
Size
mm
nominal
approx
weight kg
no. per
tonne
multiples
of
no. per
pack
440x215x100†
14.0
70
44
88
440x215x140†
19.5
51
32
64
440x215x190‡
27.5•
36
20
40
Course
adjusters
65x215x100
2.0
500
128
512
65x215x140
2.8
360
96
384
† Also available in close texture 7.3 N/mm2
‡ To order only • Blocks in excess of 20kg – please use with caution after
assessing the risks.
U-Value 0.22
Outside
resistance
0.040
19mm sand/cement render (λ 1.00)
0.019
100mm Stowlite 7.3N/mm2 (λ 0.61)
0.164
50mm low emissivity cavity
0.640
50mm foil-faced partial fill PIR/PU board (λ 0.022)
2.273
100mm Stowlite 7.3N/mm2 (λ 0.57)
0.175
15mm dabs
0.170
25mm phenolic insulation (λ 0.022)
1.136
bonded to...
13mm plasterboard
(λ 0.21)
0.062
Inside resistance
0.130
Sum of resistances
4.809m2K/W
Uncorrected U-value
0.208 W/m2K
Mortar correction
0.000
Air gap correction
0.010
Wall tie correction - Staifix HRT4-225
0.001
U-VALUE
0.219W/m2K
U-Value 0.27
Outside
resistance
0.040
19mm sand/cement render (λ 1.00)
0.019
100mm Stowlite 7.3N/mm2 (λ 0.61)
0.164
100mm high performance mineral wool (λ 0.032)
3.125
100mm Stowlite 7.3N/mm2 (λ 0.57)
0.175
13mm dense plaster (λ 0.57)
0.023
Inside resistance
0.130
Sum of resistances
3.676m2K/W
Uncorrected U-value
0.272 W/m2K
Mortar correction
0.000
Air gap correction
0.000
Wall tie correction - Staifix HRT4-225
0.001
U-VALUE
0.273W/m2K
U-Value 0.27
Outside
resistance
0.040
19mm sand/cement render (λ 1.00)
0.019
100mm Stowlite 7.3N/mm2 (λ 0.61)
0.164
50mm low emissivity cavity
0.640
60mm foil-faced partial fill PIR/PU board (λ 0.022)
2.727
100mm Stowlite 7.3N/mm2 (λ 0.57)
0.175
13mm dense plaster (λ 0.57)
0.023
Inside resistance
0.130
Sum of resistances
3.918m2K/W
Uncorrected U-value
0.255 W/m2K
Mortar correction
0.000
Air gap correction
0.010
Wall tie correction - Staifix HRT4-250
0.002
U-VALUE
0.267W/m2K
The Stowlite concrete block offers the builder an alternative product midway in the range between the dense concrete block and the high performance Fibotherm block. Stowlite blocks are widely used in a number of applications where high insulation is not such a priority. Being lighter than the standard dense block, handling is easier, often making savings on foundations and labour.
Standard Stowlite blocks provide a good finish for rendering. 100mm and 140mm Stowlite blocks are available in close texture finish, please CLICK HERE for more information..
