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What size rock is best suited for filling in and around the Keystone units in the drainage zone?

April 26, 2017best drainage Filling Keystone rock size suited units zone

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What size rock is best suited for filling in and around the Keystone units in the drainage zone?

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A clean, angular W (20mm) rock is best for corefill if available. Otherwise, use a clean rock material that is ‘/2 – 1 ‘/2″ (15-40mm) in diameter. Avoid aggregates that are round in nature. Angular material will provide the best interlocking strength. Also, avoid material that contains a lot of fine grains in that these fines can flow with water through the wall and possibly stain the wall face.