C O P I N G S C O N C R E T E B L O C K S T B E A M S PAV I N G K E R B S C H A N N E L S PA D S T O N E S

www.stowellconcrete.co.ukwww.stowellconcrete.co.ukTel: 01934 834000 Fax: 01934 835474Tel: 01934 834000 Fax: 01934 835474

STOWELLC O N C R E T E L I M I T E D

1h1.8

44mm (47mm) 44mm (47mm)BASIC UNIT SPLITTER UNIT

215mm

215mmhollow

150mm(144mm)

140mm hollow

67mm(63mm)

Hollow concrete blocks7.3N/mm2 to BS EN 771-3

129mm(123mm)

125mm(119mm)

166mm(160mm)

136mm(130mm)

125mm(119mm)

67mm(63mm)

34mm (38mm) 34mm (38mm)

(XXmm) = approximate

dimensions at base of hollow

Hollow approx gross approx no. per multiples no. per splittersSize mm nominal concrete density weight tonne of pack(L x W x H) density kg/m3 kg kg/m3

440 215 215 2000 1300 27• 37 10 60 1 in 5

440 140 215 2000 1300 18 56 16 96 1 in 16

1m3 of concrete will fill approx. 14m2 of 215mm hollow blocks (laid 215mm wide) or approx. 22m2 of 140mm hollow blocks (laid 140mm wide).

140mm hollows when filled with concrete (2400kg/m3) create a wall mass of 403kg/m2

which gives a weighted sound insulation (Rw) of 49dB* while 215mm hollows when filled with concrete (2400kg/m3) create a wall mass of 518kg/m2 which gives a weighted sound insulation (Rw) of 50dB*.

When filled with concrete (2400kg/m3) the thermal resistance** of 215mm wide hollow blocks is 0.143 m2 K/W whereas for 140mm wide hollow blocks the value is 0.093 m2 K/W.

* Calculated using mass law curve BS8233 (with two skins of dense plaster each 25kg/m2)

** 3% moisture content.

All products available ex works. Prices on application. Telephone the sales office for further information and a quotation.

•Blocks in excess of 20kg – please use with caution after assessing the risks.

We offer two sizes of hollow concrete block to complement our range of solid dense blocks. They are manufactured to BS EN 771-3 using Class 1 limestone aggregates.

The blocks are available in a standard face size of 440 215mm and in thicknesses of 140mm and 215mm in a standard finish (suitable for rendering). They are primarily used in locations that require construction using a reinforced concrete wall and in agricultural buildings.