Planning & EstimatingQuestion 297 of 360
When planning a trench for a building sewer, what does the CPC require regarding the bottom of the trench?
a.It may contain sharp rocks as long as the pipe is strong
b.The pipe must rest on a firm bed for its entire length, with bell holes provided at joints
c.The trench must be filled with water first
d.The bottom can slope backward toward the building
Explanation
CPC 313.0 requires piping to be laid on a firm bed throughout its length, with bell holes excavated at joints so the barrel bears evenly. Point loading on rocks or unexcavated bell holes can crack pipe or throw off the slope. Planning proper bedding protects the line and keeps the required fall to the main.
Law Reference: 2022 California Plumbing Code (CPC) §314.0Practice all 360 questions free — no signup required.
Related questions on this topic
- An estimator prices a job at 2 fixtures' rough-in per hour and there are 40 fixtures. If the labor rate is $60/hour, what is the estimated rough-in labor cost?
- Why should you check which edition of the California Plumbing Code the local jurisdiction has adopted before finalizing a design?
- In a plumbing isometric drawing, pipes are drawn at what angle to represent the three dimensions on a flat sheet?
- A plan note reads "See detail 3/P-4." What does this callout tell the installer?
- Before excavating a trench for underground plumbing on a commercial site, which coordination step is most important for safety and to avoid utility strikes?
- When sizing a building sewer during layout, the required size is based primarily on what?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review