Dense concrete blocks/bricks 10.4N/mm² to BS EN 771-3
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/ Dense concrete blocks/bricks 10.4N/mm²
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.
The blocks are available in a standard face size of 440 x 215mm and in thicknesses of 100mm, 140mm and 190mm in a standard finish (suitable for rendering).
Dense Concrete Block ~ 10.4N/mm² (OVEN-DRY DENSITY approx 2050 kg/m³)
| Size mm nominal (L x W x H) | approx weight kg | no. per tonne | multiples of | no. per pack |
|---|---|---|---|---|
| 440x100x215† | 20 | 50 | 44 | 88 |
| 440x140x215† | 28• | 36 | 32 | 64 |
| 440x190x215 | 38• | 26 | 24 | 48 |
† Also manufactured in close texture. Click here
for photos and further information.
•Blocks in excess of 20kg – please use with caution after assessing the risks.
Coursing Bricks ~ 10.4N/mm² (OVEN-DRY DENSITY approx 2050 kg/m³)
| Size mm nominal (L x W x H) | approx weight kg | no. per tonne | no. per pack |
|---|---|---|---|
| 215x100x65 | 2.8 | 340 | 452 |
| 215x140x65 | 4.2 | 240 | 296 |
THERMAL CONDUCTIVITY: λ*
1.39 W/mK @ 3% m/c (Inside skin)
1.49 W/mK @ 5% m/c (Outside skin)
THERMAL RESISTANCE:
| SIZE mm | m²K/W at: | m²K/W at: |
|---|---|---|
| 100mm | 3% m/c 0.072 | 5% m/c 0.067 |
| 140mm | 3% m/c 0.101 | 5% m/c 0.094 |
| 190mm | 3% m/c 0.137 | 5% m/c 0.128 |
(m/c = moisture content)
WEIGHTED SOUND INSULATION Rw:**
45 dB (100mm single skin, 249kg/m²)
47 dB (140mm single skin, 331kg/m²)
49 dB (190mm single skin, 439kg/m²)
FIRE RESISTANCE:***
100mm 2 hrs
140mm 3 hrs
190mm 6 hrs
* Calculated from oven dry density
** Calculated using mass law curve - BS8233 (with 2 skins of dense plaster each 25kg/m²)
*** Calculated using table NA 3.2 BS EN 1996-1-2 : 2005 (unplastered separating load bearing single leaf walls)
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 10.4N/mm2 (λ1.39) | 0.072 |
| 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 | 5.559 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 10.4N/mm2 (λ1.39) | 0.072 |
| 13mm dense plaster (λ0.057) | 0.023 |
| Inside resitance | 0.130 |
| Sum of resistances | 5.667 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 |
| 100mm foil-faced partial fill PIR/PU board (λ0.018) | 5.556 |
| 100mm dense 10.4N/mm² (λ1.39) | 0.072 |
| 13mm dense plaster (λ0.057) | 0.023 |
| Inside resistance | 0.130 |
| Sum of resistances | 6.550 m²K/W |
| Uncorrected U-value | 0.153 W/m²K |
| Mortar correction | 0.000 |
| Air gap correction | 0.007 |
| Wall tie correction – Staifix HRT4-225 | 0.005 |
| U-VALUE | 0.165 W/m²K |
