CSLB C-36 Plumbing ContractorRough-in PlumbingMedium
A plumbing contractor is installing a new residential gas piping system using Corrugated Stainless Steel Tubing (CSST). What specific protective requirement applies when CSST is installed in concealed locations, such as within wall cavities or attics, to prevent damage from nails or screws?
- ANo special protection is required if the CSST is installed according to manufacturer's instructions.
- BThe CSST must be painted with a high-visibility color for inspection.
- CThe CSST must be sleeved in PVC conduit when passing through studs.
- DSteel strike plates or shields must be installed on the studs or joists where the CSST passes within 1.5 inches of the edge.
Show answer & explanationAnswer & explanation
Correct answer: D. Steel strike plates or shields must be installed on the studs or joists where the CSST passes within 1.5 inches of the edge.
To protect CSST from puncture by nails or screws in concealed locations, the California Plumbing Code (CPC) requires the installation of steel strike plates or shields on wood framing members where the tubing is within 1.5 inches of the framing edge. This is similar to electrical wiring protection.
Why the other options are wrong
- A. While manufacturer's instructions are important, specific code requirements for mechanical protection also apply.
- B. Painting for visibility is not a code-mandated protection against physical damage from nails or screws.
- C. While sleeving is used for other purposes (e.g., concrete), it's not the primary method for nail plate protection in wood framing for CSST.
CSST Nail Plate Protection
Requirement for steel plates or shields to protect Corrugated Stainless Steel Tubing (CSST) from puncture by nails or screws in concealed wall or ceiling cavities.
- Mandatory for CSST in concealed spaces.
- Protects against damage from building fasteners.
- Required when CSST is near framing edges (1.5 inches).
Memory trick: CSST in Walls? 'Shield' it from 'Strikes'!