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Pipe & box bedding

Pick a pipe type and nominal size — O.D., side clearance, and density auto-fill from the office tables. Change any value to match your detail. Box mode sizes a CSS shell from perimeter + 8. Not a substitute for engineered bedding drawings.

Pipe & box bedding calculator

Pick a pipe type and size — O.D., side bedding, zone height, bottom bedding, backfill above crown, and density auto-fill from the STC office tables. Override any value to match your detail. Net bedding = zone area minus pipe. Box mode uses perimeter × 1′ CSS.

Clearance on each side. Zone width = OD + 2 × side.

Total pipe-zone height (invert to top of envelope).

Invert to trench bottom / subgrade.

Crown to top of pipe zone. Editing this updates zone height.

Auto-set from pipe type. Edit to override.

Water PVC 4″ nominal
O.D.
4.4″
Side bedding ea.
12″
Zone w × h
2.37′ × 2.37′
Bottom bedding
12″
Backfill above crown
1.002′
Pipe area
0.106 ft²
Net bedding
5.496 ft²/LF
CY / LF
0.204
Tons / LF
0.297
Excess (≈0.7×)
0.208 t/LF
Density
1.46 t/CY
Totals for 100 LF run
CY 20.35
Tons 29.72
Excess 20.8 t

These free calculators are for informal support and education only. S Thomas Construction is not responsible for errors, omissions, misuse, or any decisions, damages, losses, or unsafe practices based on them. By using any calculator on this site, you agree to the Terms of Use below.

This notice does not replace our general Terms of Service.

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These free calculators are for informal support and education only. S Thomas Construction is not responsible for errors, omissions, misuse, or any decisions, damages, losses, or unsafe practices based on them. By using any calculator on this site, you agree to the Terms of Use below.

This notice does not replace our general Terms of Service.