Cast Stone – The Material.
The Sterling Cast Stone range is manufactured in cast stone complying with BS 1217, 1997.
Whilst most of the range is produced using the drycast 2 part mix method, units can also be produced using a homogenous 1 part coloured mix and also using the wet cast method where higher strengths are required for larger units.
The cast stone material used is composed of a blend of sands, cement, colouring pigments and an integral waterproofing agent, which when sufficiently cured, will provide a minimum crushing strength of 25 N/mm2.
Where used in 2 part mix form, the cast stone facing is a minimum of 25mm thick.
Backing concrete has a minimum crushing strength of 25 N/mm2, but this can be increased up to
50 N/mm2 if required when producing larger units.
Our cast stone units are manufactured using high quality craftsman-built timber moulds from our own in-house joinery shop.
Where reinforcement is required, this is cut, bent and fixed in our own in-house steel shop.
When producing cast stone masonry units using the 2 part mix method, the mould is first lined with the finishing material immediately before the backing material is placed. This is then compacted into the mould using compressed air driven hammers which ensures good interdiffusion of the 2 mixes to provide a solid, dense unit.
The unit is immediately demoulded for hand finishing by our tradesman when required.
Sterling Cast Stone units are kept within a draught free, temperature and humidity controlled environment for a minimum of 48 hours, they are then palletised and wrapped in protective polythene, to protect them from drying winds, and relocated to the external stacking area to cure fully.
Units will normally be in the region of 2-4 weeks old before being ready for collection or delivery.
Delivery to sites which have their own Mechanical Offload facility, will be via our own articulated transport.
Request to deliver on smaller rigid vehicles or on vehicles with Hiab can be arranged at additional cost.
Customers are welcome to collect their material if required and private customers are advised that material is only available for collection only. We are happy to deal via builders merchants where private customers hold their own account.