Perryfield Shelly

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Description

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

Petrography

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.

Durability & Weathering

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.

Physical Characteristics

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