Portland limestone Coombefield whitbed
Coombefield whitbed is a tightly grained Portland stone with medium shell content. Durable and suitable for all most applications as a general building stone including, paving and copings, it is easily carved and can be shaped to suit most applications. This quarry is now coming to the end of its working life and while we still have reasonable stocks, it should not be considered for large projects.
Sizes Available: – Maximum Typical Range
Bed Height: 600mm to 1,500mm
Length: 800mm to 2,800mm
Coombefield Whitbed is known to be a durable building stone and has been used extensively within the United Kingdom and Abroad. It exhibits a low saturation coefficient, good strength and good resistance to salt crystallisation.
Historic use indicates that it is capable of service life well in excess of 60 years providing that exposure conditions are not subject to frequent severe frosts or high concentrations of sulphur dioxide and that good stone detailing methods are employed to give best protection from surface water ingress.
It is estimated that the likely weathering rate of this stone would lie between 1mm to 2mm per 100 years in normal exposure conditions.