Stowlite medium dense blocks/
bricks 7.3N/mmto BS EN 771-3

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. Stowlite blocks are available in close texture finish – please CLICK HERE for more information.

7.3N/mm2 (OVEN-DRY DENSITY approx 1500 kg/m3)
Size
mm
nominal
approx
weight kg
no. per
tonne
multiples
of
no. per
pack
440 x 100 x 215† 14.0 70 44 88
440 x 140 x 215† 19.5 51 32 64
440 x 190 x 215‡ 27.5• 36 24 48
Coursing bricks
215 x 100 x 65 2.0 500 128 512
215 x 140 x 65 2.8 360 96 384

† Also manufactured in close texture 7.3N/mm2
‡To order only
• 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 7.3N/mm2  (λ0.63) 0.159
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 5.813 m2K/W
Uncorrected U-value 0.172 W/m2K
Mortar correction 0.000
Air gap correction 0.002
Wall tie correction – Staifix HRT4-225 0.002
U-VALUE 0.176 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 7.3N/mm2 (λ0.63) 0.159
13mm dense plaster (λ0.057) 0.023
Inside resistance 0.130
Sum of resistances 5.754 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 7.3N/mm2 (λ0.63) 0.159
13mm dense plaster (λ0.057) 0.023
Inside resistance 0.130
Sum of resistances 6.081 m2K/W
Uncorrected U-value 0.164 W/m2K
Mortar correction 0.000
Air gap correction 0.007
Wall tie correction – Ancon ST1-300 0.005
U-VALUE 0.176 W/m2K

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

THERMAL RESISTANCE:
SIZE mm m2K/W at: m2K/W at:
100 3%m/c 0.159 5%m/c 0.149
140 3%m/c 0.222 5%m/c 0.209
190 3%m/c 0.302 5%m/c 0.284
(m/c = moisture content)

WEIGHTED SOUND INSULATION Rw:**
44 dB 75mm single skin, 200kg/m2
46 dB 100mm single skin, 262kg/m2
48 dB 140mm single skin, 348kg/m2

FIRE RESISTANCE:***
100mm (single skin unplastered) 2 hrs
140mm (single skin unplastered) 3 hrs
190mm (single skin unplastered) 6 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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FOR THIS PRODUCT
PDF Data Sheet

All products are available ex works.
Prices on application.
Telephone our sales office for further information and quotations.