Dense concrete blocks
17.5N/mmto 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.

The blocks are available in a standard face size of 440 x 215mm and in thicknesses of 100mm and 140mm in a standard finish (suitable for rendering).

17.5N/mm2 (OVEN-DRY DENSITY approx 2100 kg/m3)
Size
mm
nominal
approx
weight kg
no. per
tonne
multiples
of
no. per
pack
440 x 100 x 215 21• 48 44 88
440 x 140 x 215 29• 34 32 64

• 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 dense 17.5N/mm2  (λ1.46) 0.068
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 5.722 m2K/W
Uncorrected U-value 0.175 W/m2K
Mortar correction 0.000
Air gap correction 0.002
Wall tie correction – Staifix HRT4-225 0.000
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 dense 17.5N/mm2 (λ1.46) 0.068
13mm dense plaster (λ0.057) 0.023
Inside resistance 0.130
Sum of resistances 5.663 m2K/W
Uncorrected U-value 0.177 W/m2K
Mortar correction 0.000
Air gap correction 0.000
Wall tie correction – Ancon ST1-300 0.004
U-VALUE 0.181 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 dense 17.5N/mm2 (λ1.46) 0.068
13mm dense plaster (λ0.057) 0.023
Inside resistance 0.130
Sum of resistances 5.990 m2K/W
Uncorrected U-value 0.167 W/m2K
Mortar correction 0.000
Air gap correction 0.007
Wall tie correction – Ancon ST1-300 0.005
U-VALUE 0.179 W/m2K

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

THERMAL RESISTANCE:
SIZE mm m2K/W at: m2K/W at:
100 3%m/c 0.068 5%m/c 0.064
140 3%m/c 0.096 5%m/c 0.090
(m/c = moisture content)

WEIGHTED SOUND INSULATION Rw:**
45 dB 100mm single skin, 253kg/m2
47 dB 140mm single skin, 338kg/m2

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

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