We describe this as mostly a shelly stone with a slightly open texture, but it does not have the openness of Roach.
Perryfield shelly is exceptionally durable due to the high shell content and as such can be used in more exposed area’s.
The high shell content increases its durability but reduces its suitability for heavily detailed or carved work. Instead the Portland stone is used for ashlar, paving and copings.
We have sufficient stock on the ground for most projects
Portland Oolitic Limestone
Principally formed from micritic ooids in a sparse micritic matrix, the stone contains many shell fragments in the size range 1mm to 5mm. Some compaction of the ooids is present but the matrix exhibits moderate intergranular porosity with interlinking of pores. No clay or other minerals are apparent.
Perryfield Shelly Whitbed exhibits a low saturation coefficient, good strength and resistance to salt.
Test results indicate that it is capable of a service life in excess of 60 years providing that exposure conditions are not subject to severe frosts or high concentrations of sulphur dioxide and that good stone detailing methods are employed to give best protection from water ingress.
It is estimated that the likely weathering rate of this stone would lie between 1mm to 3mm per 100 years in normal exposure conditions.
Colour: Buff/White Texture: Medium to Fine Grained
Sizes Available:- Maxiumum Typical Range
Bed Height: 1800mm 600mm – 1500mm
Length: 4000mm 800mm – 2800mm
Block Size: 5.0 m3 0.40 m3 – 3.8 m3
Portland Stone Firms Ltd is a limestone supplier and manufacturer based in Portland, UK.
We supply Portland stone paving, flooring, solid steps, treads, risers, ashlar, cladding, cropped walling, carving services and fireplace surrounds.
Website © Stone Firms 2010 - 2012
