Stowlite medium dense blocks/
bricks 10.4N/mmto BS EN 771-3

Stowlite 10.4N/mm2 blocks are approximately 22% lighter than the dense block of the same strength and provide a good background for rendering.

10.4N/mm2 (OVEN-DRY DENSITY approx 1600 kg/m3)
Size
mm
nominal
approx
weight kg
no. per
tonne
multiples
of
no. per
pack
440 x 100 x 215 15.5 64 44 88
440 x 140 x 215 22.0• 46 32 64
Course adjusters
215 x 100 x 65 2.3 430 128 512
215 x 140 x 65 3.2 310 96 384

• Blocks in excess of 20kg – please use with caution after assessing the risks.

U-Value 0.18 Dense Concrete Block - option 1
Outside resistance 0.040
19mm sand/cement render (λ1.00) 0.019
100mm dense 7.3N/mm2 (λ1.43) 0.070
50mm low emissivity cavity 0.640
50mm foil-faced partial fill PIR/PU board (λ0.022) 2.273
100mm Stowlite 10.4N/mm2  (λ0.71) 0.141
15mm dabs 0.170
45mm phenolic insulation (λ0.020) 2.250
bonded to…
13mm plasterboard (λ0.21) 0.062
Inside resistance 0.130
Sum of resistances 5.795 m2K/W
Uncorrected U-value 0.173 W/m2K
Mortar correction 0.000
Air gap correction 0.002
Wall tie correction – Staifix HRT4-225 0.002
U-VALUE 0.177 W/m2K
U-Value 0.18 Dense Concrete Block - option 2
Outside resistance 0.040
19mm sand/cement render (λ1.00) 0.019
100mm dense 7.3N/mm2 (λ1.43) 0.070
170mm high performance mineral wool (λ0.032) 5.313
100mm Stowlite 10.4N/mm2 (λ0.71) 0.141
13mm dense plaster (λ0.057) 0.023
Inside resistance 0.130
Sum of resistances 5.736 m2K/W
Uncorrected U-value 0.174 W/m2K
Mortar correction 0.000
Air gap correction 0.000
Wall tie correction – Ancon ST1-300 0.004
U-VALUE 0.178 W/m2K
U-Value 0.18 Dense Concrete Block - option 3
Outside resistance 0.040
19mm sand/cement render (λ1.00) 0.019
100mm dense 7.3N/mm2 (λ1.43) 0.070
50mm low emissivity cavity 0.640
110mm foil-faced partial fill PIR/PU board (λ0.022) 5.000
100mm Stowlite 10.4N/mm2 (λ0.71) 0.141
13mm dense plaster (λ0.057) 0.023
Inside resistance 0.130
Sum of resistances 6.063 m2K/W
Uncorrected U-value 0.165 W/m2K
Mortar correction 0.000
Air gap correction 0.007
Wall tie correction – Ancon ST1-300 0.005
U-VALUE 0.177 W/m2K

THERMAL CONDUCTIVITY: λ*
0.71 W/mK @ 3% m/c (Inside skin)
0.76 W/mK @ 5% m/c (Outside skin)

THERMAL RESISTANCE:
SIZE mm m2K/W at: m2K/W at:
100 3%m/c 0.141 5%m/c 0.131
140 3%m/c 0.197 5%m/c 0.184
(m/c = moisture content)

WEIGHTED SOUND INSULATION Rw:**
44 dB 75mm single skin, 209kg/m2
46 dB 100mm single skin, 275kg/m2

FIRE RESISTANCE:***
100mm (single skin unplastered) 2 hrs
140mm (single skin unplastered) 3 hrs

TRANSVERSE TESTING:
100mm minimum 3.5kN

* Calculated from oven dry density
** Calculated using mass law curve – BS8233 (with 2 skins of dense plaster each 25kg/m2)
*** Calculated using table 14 BS5628-3 2005


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Prices on application.
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