Suitable for use

Further information refer to BS 5628 : Part 1 : 2005 Code of Practice for the structure use of masonry.

Block Composition

Medium density blocks are manufactured using more than 75% by volume of recycled by-product material from the generating and steel making processes. The properties of the aggregates used by Gryphonn Concrete Products in this range of blocks are strictly in accordance with relevant British Standards BS EN : 13055-1 : 2002 & BS EN : 1744 -1 : 1998.

Strengths

Standard quality medium density blocks are available from stock with a minimum average compressive strength of 3.6N/mm2 and 7.3N/mm2. Higher strengths of 10.4N/mm2 are available but would generally require to be specially ordered.

It should be noted that the higher strength blocks could vary slightly in colour and texture along with a marginal increase in block weight and density.
Further information on high strength dense concrete blocks is available from our sales department.

Thermal Properties

The thermal resistance (m2K/W) of the various medium density concrete blocks is tabulated to provide component values that can be combined with similar information on other components forming external wall construction thus enabling the calculation and comparison of the overall thermal conductivity of different constructional solutions. The K values (W/mK) are based on the standard values of lightweight blocks given in the CIBSE guide A : Environmental Design.

Moisture Movements

Drying shrinkage will not exceed the limiting values specified in BS EN 772-14 : 2002 when measured in accordance with that specification. Drying shrinkage may not occur if the product is used in permanently damp conditions.