Plumbing · P-5HG84

Underground Pipe Trench Backfill and Cover Detail

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An underground pipe is bedded in a trench with specified backfill and compaction layers. Wet or unstable trench bottoms require a base of one and a half inch stone beneath the pipe. Hand backfill using selected loose earth, sand, or gravel is placed directly around the pipe. Machine backfill is then placed in six-inch lifts with good fill, free of large rocks, frozen chunks, debris, or spongy material, and compacted to ninety percent density. A minimum cover of twelve inches is maintained, increasing to twenty-four inches for gas piping. The top layer up to the finished grade receives ninety-five percent compaction.

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