Plumbing · P-FA8YP

Cast Iron Piping Trench Detail

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A cast iron pipe ranging from two to six inches sits within an excavated earth trench beneath a finish slab. The pipe rests on a bedding layer of sand, pea gravel, or three-quarter-inch crushed rock backfill. The main trench backfill consists of pea gravel, three-quarter-inch crushed rock, or native soil extending up to the subgrade. Additional gravel and rock fill layer beneath the finish slab to complete the installation.

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