Planning & EstimatingQuestion 280 of 360
On a plumbing riser diagram, what does the drawing primarily show?
a.A vertical, not-to-scale schematic of how piping rises through the floors and connects stacks, branches, and fixtures
b.The exact horizontal dimensions of every pipe on the site
c.The property survey and lot lines
d.The electrical panel schedule
Explanation
A riser diagram is a vertical schematic, usually not to scale, showing how stacks, branches, vents, and fixtures connect from floor to floor. It clarifies the system's vertical relationships that a flat plan view cannot. Estimators use it with the floor plans to count vertical footage and stack fittings.
Practice all 360 questions free — no signup required.
Related questions on this topic
- When planning cleanout locations on a long horizontal building drain, what is the maximum spacing between cleanouts under the CPC?
- When planning backfill over a drainage pipe laid in a trench, what is the correct practice under the CPC?
- In estimating, a "labor unit" for a plumbing task usually represents what?
- A plan symbol showing a small circle with a bisecting line and the note "FD" most likely indicates what?
- The plan scale is 1/4 inch = 1 foot. A water line measures 5 inches on the drawing. What is the actual pipe length?
- When you coordinate plumbing rough-in with the framing crew, why is it important to review the structural drawings before drilling floor joists?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review