Dense Concrete Block/Bricks 10.4N/mm² to BS EN 771-3
Stowell dense concrete blocks offer the builder a full range of solid concrete blocks with a well-established durability, low drying shrinkage and proven acoustic properties that will fulfil most applications. They are manufactured to BS EN 771-3 using Class 1 limestone aggregates and recycled aggregates.
The blocks are available in a standard face size of 440 x 215mm and in thicknesses of 75mm, 100mm and 140mm in a standard finish (suitable for rendering). 100mm and 140mm wide blocks are available in close texture finish – please click here
for photos and further information.
| Size mm nominal | approx weight kg | no. per tonne | multiples of | no. per pack |
|---|---|---|---|---|
| 440x75x215 | 14 | 72 | 60 | 120 |
| 440x100x215† | 19 | 53 | 44 | 88 |
| 440x140x215† | 27• | 37 | 32 | 64 |
† Also manufactured in close texture. Please see page 1.7 or photos and further information.
•Blocks in excess of 20kg – please use with
caution after assessing the risks.
THERMAL CONDUCTIVITY: λ*
1.33 W/mK @ 3% m/c (Inside skin)
1.43 W/mK @ 5% m/c (Outside skin)
THERMAL RESISTANCE:
SIZE mm m2K/W at: m2K/W at:
75mm 3% m/c 0.056 5%m/c 0.052
100mm 3% m/c 0.075 5%m/c 0.070
140mm 3% m/c 0.105 5%m/c 0.098
(m/c = moisture content)
WEIGHTED SOUND INSULATION Rw:**
44 dB 75mm single skin, 202kg/m2
45 dB 100mm single skin, 244kg/m2
47 dB 140mm single skin, 325kg/m2
FIRE RESISTANCE:***
75mm ½hr @60% loading
100mm 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 and BSEN 1996-1-2
U-Value 0.18
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 dense 7.3N/mm2 (λ1.33) 0.075
15mm dabs 0.170
37.5mm phenolic insulation (λ0.018) 2.083
bonded to…
13mm plasterboard (λ0.21) 0.062
Inside resistance 0.130
Sum of resistances 5.562 m2K/W
Uncorrected U-value 0.180 W/m2K
Mortar correction 0.000
Air gap correction 0.002
Wall tie correction
– Staifix HRT4-225 0.000
U-VALUE 0.182 W/m2K
U-Value 0.18
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 dense 7.3N/mm2 (λ1.33) 0.075
13mm dense plaster (λ0.057) 0.023
Inside resistance 0.130
Sum of resistances 5.670 m2K/W
Uncorrected U-value 0.176 W/m2K
Mortar correction 0.000
Air gap correction 0.000
Wall tie correction
– Ancon ST1-300 0.004
U-VALUE 0.180 W/m2K
U-Value 0.17
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 (λ0.018) 5.356
100mm dense 7.3N/mm2 (λ1.33) 0.075
13mm dense plaster (λ0.057) 0.023
Inside resistance 0.130
Sum of resistances 6.553 m2K/W
Uncorrected U-value 0.153 W/m2K
Mortar correction 0.000
Air gap correction 0.007
Wall tie correction
– Ancon ST1-300 0.005
U-VALUE 0.165 W/m2K
