Hollow concrete blocks
7.3N/mmto BS EN 771-3

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 x 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.

(XXmm) = approximate dimensions at base of hollow

Hollow
Size
mm
nominal
approx
concrete
density
kg/m3
gross
density
kg/m3
approx
weight
kg
no.
per
tonne
multiples
of
no.
per
pack
splitters
440 x 215 x 215 2000 1300 27• 36 10 60 1 in 5
440 x 140 x 215 2000 1300 18 56 16 96 1 in 16

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



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.


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