Guiting Stone

Guiting Stone is an Oolitic limestone originating from the Inferior Oolite formation of middle Jurassic Age. Guiting Stone is principally formed from micritic ooids in a micritic matrix with small shells, the stone is medium to fine grained with no clay minerals present.

Guiting Stone from Coscombe Quarry has traditionally been used for masonry both in the local community and further afield.

Description

Product Type: Oolitic limestone
Category: Jurassic
Quarry: Guiting (Coscombe) Quarry
Material: Cotswold Stone

Products Available

  • Raw block stone
  • Walling stone

Geology

Oolitic limestone originating from the inferior Oolite formation of middle Jurassic age.

Petrography

Principally formed from micritic ooids in a micritic matrix with small shells, the stone is medium to fine grained with no clay minerals present.

Durability & Weathering

Guiting Stone from Coscombe Quarry has traditionally been used for masonry both in the local community and further afield. Although one of the softer building limestones, it weathers well, especially when stonework is detailed to offer maximum protection to rainwater and rainwater run-off.

Based on current research, it seems likely that the stone will weather at a rate of between 3 and 4 millimetres per 100 years, but it could be greater in severe exposures or on the edges of stonework.

Projects Using Guiting Stone

  • Balliol College - Oxford, 1906
  • Royal Oxford Hotel - Oxford, 1938
  • Prinknash Abbey - Gloucestershire, 1970
  • Cosenor's House - Abingdon, 1980
  • Police Houses (Walling Stone) Sturminster - Newton, 1981
  • Bursar's Lodge, Magdalen College - Oxford, 1983
  • Tudor Gatehouse, Tewkesbury Abbey - Tewkesbury, 1986
  • Internals - Trocadero - Oxford, 1990
  • The Podium - Bath, 1992
  • Town House - Kuwait, 1996
  • Ealing Abbey - Ealing, 1997
  • Paddock House Withington - Gloucestershire, 2000
  • Home Farm Estate Toddington - Gloucestershire, 2000
  • The Vines Stanton, 2000
  • Rolling Stone Orchard, Back Ends - Chipping Campden, 2000
  • Besford Court - Pershore, 2000

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Physical Characteristics

Colour: Light cream — two beds/ Dark cream
Texture: Medium to fine grained

Block Size

MaximumTypical Range
Bed height1000mm300mm - 1000mm
Length2000mm800mm - 2000mm
Block size2.0m30.20m3 - 2.0m3

Test Data

Test Parameter Physical

Mean Result
Porosity (CEN)26.7%
Saturation coefficient (BRE 141)0.82
Water absorption (by weight)11.0%
Bulk specific gravity (Kg/m3)1992
Salt crystallisation (BRE 141/CEN)35.7%
Compressive strength (CEN) MPA dry14.1
Flexural strength (CEN) MPA dry3.5
Safety in Use
Abrasion resistance CENTC17836.1