At Marshalls, we are committed to supplying the highest quality materials to the UK market. Many of the cheaper Indian sandstones supplied in the UK are soft, porous sandstones, which are often not fit for purpose and could fail during installation or once installed.
To help save our customers from poor quality sandstone, we created the Marshalls Stone Standard, a list of guarantees we stand by that give you that give you complete confidence in the sandstone you select from us.
Our guarantee to you:
All sandstone sold by Marshalls will have a maximum water absorption of 1.7%.
The lower the percentage, the less water will absorb into your stone. This means your stone will look healthier for longer with reduced algae or lichen growth.
All sandstone sold by Marshalls will have a flexural strength of no less than 12.9MPa.
Flexural strength is an indicator of the strength of stone. The higher the number, the less chance there is of the stone failing or delaminating once in-situ.
All sandstone sold by Marshalls will be frost resistant.
If a stone loses strength or starts to fall apart when subjected to repeated frosts then it isn’t fit for purpose. The Marshalls Standard is a reduction of no more than 10% on the flexural strength of the stone after 56 freeze/thaw cycles and a visual inspection rating of ‘0’. This means that Marshalls has given a commitment not to supply a stone that shows any frost impact.
The Marshalls Stone Standard mark gives you assurance that all Marshalls sandstone products exceed the base technical levels outlined in the British Standard, BS 7533 Class 2.
