Planning & EstimatingQuestion 291 of 360
You must coordinate a 4-inch sanitary line and an HVAC duct that cross in a tight ceiling. What is the best planning step to resolve the conflict before installation?
a.Install whichever trade arrives first and let the other adjust
b.Cut the duct on site without telling anyone
c.Ignore it since pipes always win
d.Compare the trades' drawings (or a coordination/BIM model) to reroute one system and preserve required clearances and drain slope
Explanation
Overlaying the plumbing, mechanical, and structural drawings, or a coordination model, reveals clashes so one system can be rerouted on paper. The drain must keep its required slope, so it usually sets the elevation and the flexible duct moves. Resolving clashes before installation avoids demolition and schedule delays.
Practice all 360 questions free — no signup required.
Related questions on this topic
- While laying out the building drain you reach a 90° change of direction. Under the CPC, what feature is generally required at such a change of direction on the horizontal drain?
- What is the main purpose of a plumbing fixture schedule on a set of plans?
- When sizing the water distribution system for a building, which CPC-recognized method bases pipe sizes on total demand expressed in water supply fixture units and available pressure?
- What does the term "top-out" refer to during the phases of a plumbing installation?
- On a plumbing plan you see three parallel lines each with a different break symbol: a single dash, a dash-dot, and a solid. What is the best way to know which system each represents?
- 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?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review