Perryfield Roach
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Description
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.
Petrography
Portland Oolitic Limestone
Principally formed from micritic ooids in a sparse micritic matrix, the stone contains high quantities of shell fragments in the size range 5mm to 40mm. Some compaction of the ooids is present but the matrix exhibits a high intergranular porosity with interlinking of pores. No clay or other minerals are apparent.
Durability & Weathering
Perryfield Roach is known to be a very durable building stone and has been used extensively within the United Kingdom. It has good resistance to salt crystallisation.
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.
Physical Characteristics
Colour: Buff White Texture: Open with large amounts of shell
Sizes Available:- Maxiumum Typical Range
Bed Height: 1200mm 500mm – 1000mm
Length: 3000mm 800mm – 2000mm
Block Size: 4.0 m3 0.40 m3 – 3.0 m3
Please note that limestone is a natural material and is subject to variations in colour, pattern and/or texture.
Only full bed height samples each numbered and acknowledged by all parties involved could be considered contractual.
To that end it is essential that a visit to our quarries to select the range required is advised.