Stowlite medium dense blocks/bricks 7.3N/mm² to BS EN 771-3
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/ Stowlite medium dense blocks/bricks 7.3N/mm²
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.
Medium Dense Blocks ~ 7.3N/mm² (OVEN-DRY DENSITY approx 1500 kg/m³)
| Size mm nominal (L x W x H) | approx weight kg | no. per tonne | multiples of | no. per pack |
|---|---|---|---|---|
| 440x100x215† | 14.5 | 68 | 44 | 88 |
| 440x140x215† | 19.5 | 51 | 32 | 64 |
† 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 ~ 7.3N/mm² (OVEN-DRY DENSITY approx 1500 kg/m³)
| Size mm nominal (L x W x H) | approx weight kg | no. per tonne | no. per pack |
|---|---|---|---|
| 215x100x65 | 2.2 | 465 | 452 |
| 215x140x65 | 2.8 | 360 | 296 |
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: |
|---|---|---|
| 100mm | 3% m/c 0.159 | 5% m/c 0.149 |
| 140mm | 3% m/c 0.222 | 5% m/c 0.209 |
(m/c = moisture content)
WEIGHTED SOUND INSULATION Rw:**
44 dB (100mm single skin, 200kg/m²)
46 dB (140mm single skin, 262kg/m²)
FIRE RESISTANCE:***
100mm 2 hrs
140mm 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 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 Stowlite 7.3N/mm² (λ0.63) | 0.159 |
| 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 | 5.646 m²K/W |
| Uncorrected U-value | 0.177 W/m²K |
| Mortar correction | 0.000 |
| Air gap correction | 0.002 |
| Wall tie correction – Staifix HRT4-225 | 0.002 |
| U-VALUE | 0.181 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 22.5N/mm² (λ1.52) | 0.159 |
| 13mm dense plaster (λ0.057) | 0.023 |
| Inside resitance | 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 0.16
| 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 Stowlite 7.3N/mm² (λ0.63) | 0.159 |
| 13mm dense plaster (λ0.057) | 0.023 |
| Inside resistance | 0.130 |
| Sum of resistances | 6.637 m²K/W |
| Uncorrected U-value | 0.151 W/m²K |
| Mortar correction | 0.000 |
| Air gap correction | 0.007 |
| Wall tie correction – Staifix HRT4-225 | 0.005 |
| U-VALUE | 0.163 W/m²K |
