Costhorpe Building ProductsCosthorpe Building Products

Technical Information


Standards:
Thorpestone Architectural Cast Stone is manufactured to BS 1217: 1997.

Cement Efflorescence:
As with all reconstructed stone cement-based products, the temporary phenomenon known as efflorescence is likely to occur. This causes a lightening of colour and is in no way detrimental to the product. This effect reduces over a period of time with natural weathering.

Manufacturing Tolerances:

Dimensional tolerances permitted by BS 1217: 1997
Dimension (mm)
Tolerance (mm)

Up to 600

601 - 1000

1001 - 2500

2501 - 4000

Over 4000

±2

±3

±4

±5

±6
NB: Normally units of over 1500 in length will be supplied in two or more pieces for ease of handling.

Technical Information
Mean Compression Strength (typical)
>35 N/mm²
Mean Density
2100 Kg/m³
Water Absorption
<1.0 mg/mm2
(Capillary Absorption Tested)
Drying Shrinkage
<0.04%
Thermal Conductivity ’K’
1.40 W/m °C - exposed
1.28 W/m °C - protected
Thermal Resistance ’R’
0.071 m² °C/W - exposed
0.078 m² °C/W- protected

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