Portland limestone Perryfield roach
Perryfield roach has a very open textured and is seen as a shelly stone. Often used as a feature course or where a building requires a lot of character.
The most durable of the Portland stone range, we find it is often used for sea defence work or cladding for very heavily exposed areas. Due to its high shell content it cannot be easily carved and is more suited to ashlar panels or band courses.
We have extensive stocks of this stone with blocks typically from 1 tonne upwards to 12 tonnes.
Sizes Available: – Maximum Typical Range
Bed Height: 500mm to 1,000mm
Length: 800mm to 2,000mm
Block Size: 0.40 m3 to 3.0 m3
Technical data
Historic use indicates that it is capable of service life well in excess of 60 years providing that high concentrations of sulphuric dioxide are not present, 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.
Variation
Please note that limestone is a natural material and is subject to variations in colour, pattern and texture. It is therefore essential that you visit our quarries to select the range required. Only full bed height samples, each numbered and acknowledged by all parties involved, could be considered contractual.