19mm crushed clear graded limestone pipe bed

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Oct 11, 2020 Start the drainage stone near the base of the wall and extend up to within 6-inches of the top of the wall. To estimate the quantity of drainage stone, take the area of the wall in square feet and multiply by 1-ft to get the cubic feet of drainage stone. Divide the cubic feet by 220,000 to convert to tons or divide cubic feet by 2970 to covert ...

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