Can flexible gas line (CSST) be used to supply a fireplace, and does it need to be bonded?
Yes — CSST (that yellow or black flexible corrugated tubing) is code-approved for fireplaces and used all the time, but it must be installed by a licensed gas contractor and, critically, bonded to the home's electrical grounding system to protect against lightning-induced arcing. In North Carolina that bonding isn't optional, and running the gas line is licensed work regardless.
CSST is approved — with a hard requirement
Yes, CSST — corrugated stainless steel tubing, the flexible yellow (or black-jacketed) gas line — is code-approved to supply a fireplace and used constantly. Its flexibility makes it faster to route through framing than rigid black iron pipe. But it comes with a non-negotiable condition: CSST must be electrically bonded to the home's grounding system. That bonding protects the tubing from arcing damage if lightning energizes the home's electrical system, which can otherwise pinhole the thin corrugated wall.
Why bonding matters, especially here
We get real mountain thunderstorms up here — the same weather systems that hammer WNC each summer — so lightning-induced arcing isn't a theoretical worry. Proper bonding gives that energy a safe path and is a documented code requirement the inspector will look for. Some newer arc-resistant, black-jacketed CSST has different bonding provisions, but the manufacturer's instructions still govern, and it still has to be done right. Skipping the bond is one of the more dangerous corners an unlicensed installer can cut.
This is licensed work, start to finish
In North Carolina, running or extending any gas line — CSST included — is licensed work. A showroom, a handyman, or a general contractor legally can't connect your fireplace to fuel; a licensed gas contractor can, and that's us. We size the line, install and bond the CSST, pull the permit, and pressure-test the system before anything is lit. Never DIY a gas line. Call (828) 545-0525.
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Related questions
- Can the gas line to a fireplace be concealed inside the wall or floor?
- What size gas line does a fireplace need?
- Does a gas fireplace need a shutoff valve, and where does it have to be?
- Do you need a plumber or a licensed gas contractor to run a gas line for a fireplace?
- Will I need a bigger gas line or meter to add a fireplace to my house?
- Can I put a gas fireplace in my bedroom?
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