Thames shingle is quarried in Oxfordshire, and is light beige in appearance. The size of the gravel is typically between 14 and 20 mm. A bulk bag will cover approximately 22 sqm when spread out to a depth of 25mm. If you are looking for a good spread depth, then it is usual to go up to a depth of 50mm, in which case the coverage will be approximately 11 sqm.
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