CSLB C-36 Plumbing ContractorRough-in PlumbingMedium
A plumbing contractor is installing an underground drain pipe that will pass through a concrete foundation wall. What type of sleeve is required around the pipe where it penetrates the foundation, according to CPC?
- AA foam insulation sleeve
- BA tightly fitted metal sleeve
- CNo sleeve is required if the concrete is poured carefully
- DA loosely fitted, non-corrosive sleeve
Show answer & explanationAnswer & explanation
Correct answer: D. A loosely fitted, non-corrosive sleeve
The California Plumbing Code (CPC) requires that pipes passing through or under concrete foundation walls be protected by a loosely fitted, non-corrosive sleeve. This prevents damage to the pipe from building settlement or expansion/contraction of the concrete, and allows for minor movement.
Why the other options are wrong
- A. Foam insulation sleeves are used for thermal reasons, not specifically for structural protection through a foundation.
- B. A tightly fitted sleeve would not allow for movement and could cause damage to the pipe or foundation.
- C. A sleeve is always required for pipes penetrating foundation walls to protect against settlement and movement.
Foundation Wall Pipe Sleeve
A protective conduit installed around a pipe where it passes through a structural element like a foundation wall, to prevent damage and allow for movement.
- Protects pipes from crushing or shearing forces.
- Accommodates building settlement and thermal expansion/contraction.
- Mandated by plumbing codes for structural penetrations.
Memory trick: Pipe through the wall, don't let it fall, a loose sleeve will solve it all.