Perryfield Roach Limestone

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 Whitbed is known to be a durable building stone and has been used extensively within the United Kingdom and in Belgium. It exhibits a low saturation coefficient, good strength and resistance to salt.
Historic use indicates that it is capable of service life well 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 surface 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:       600mm                 400mm – 550mm
Length:             1400mm               500mm – 1200mm
Block Size:   4.0 m3                               0.40 m3 – 3.5 m3