Can I Run CSST Inside PVC Or Other Conduit? - Plumbing - DIY Home Improvement | DIYChatroom

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing


Thread Tools Display Modes
Old 05-23-2009, 11:48 AM   #1
Join Date: May 2009
Location: Arlington, VA
Posts: 1
Rewards Points: 10

Can I run CSST inside PVC or other conduit?

I've hired a company to extend a gas line up to the second floor of my house (duplex with tenants on the first floor). The plumber was nice enough to give me the CSST so that I can run the pipe from the basement up to the second floor, saving me some of his labor. He said that code requires all sill plate penetrations to be protected with a nail plate and gave me a couple.

Now I'm looking where the pipe will run in the first floor space, and its behind the kitchen wall, where cabinets are hung. And I'm a little uneasy with the CSST, since someone remodeling the kitchen (like me) might put nails in places besides the floor. Can I run the CSST inside 1 1/2 pvc, or even 1 1/2 black pipe, to get a little better level of protection? Just a straight piece for the vertical run in the wall. Will the inspector freak out?

Obviously it would be a disaster if the inspector failed it since then I'd have to undo everything and pay more for the company to come back out and redo all the connections. I'm just trying to make things SAFER. (Doing everything in hard pipe would be a much bigger job because of some turns to get to where the stove is on the second floor)



marvingreenberg is offline   Reply With Quote
Old 05-23-2009, 04:12 PM   #2
HVAC / Plumbing
Join Date: Feb 2009
Posts: 1,801
Rewards Points: 1,000

It's up to your inspector.. Here you can run inside the wall as long as there are no joints(connections in the wall). It may also need to be grounded.. If you are going to install it inside 1 1/2 black pipe.. Just run the pipe forget the tubing


kenmac is offline   Reply With Quote
Old 05-24-2009, 12:03 AM   #3
Registered User
Termite's Avatar
Join Date: Apr 2008
Posts: 6,520
Rewards Points: 2,000

I would say no, you can't put it in PVC. CSST must never be restrained in a stud cavity because leaving it loose helps it get out of the way of screws and nails. The PVC would restrain it and doesn't offer much protection. Plumbers that fasten CSST to the face of the studs on vertical runs are doing it wrong, albeit neater looking. Gotta leave it flopping loose.

A metal pipe sleeve would provide adequate nail strike protection but is unconventional. I'd suggest contacting the inspector before you do that. There are some bonding concerns that the metal pipe could possibly create...I wouldn't fuss about it but know of inspectors that might.

My suggestion to ease your fears would be to get what they call "stripwound conduit", which is made for CSST pipe. It is a flexible metal conduit made for exactly what you're wanting to do.

Also, be sure you got the right nailguards from your plumber. CSST nailguards are hardened steel, not mild steel. They're black, not gray or silver. If they're not black they're for your other plumbing but don't meet the CSST manufacturers' requirements. Of course the manufacturers want you using their own nailguards, but it is a requirement nonetheless. You'd be shocked how many plumbers have no clue how to properly install CSST in compliance with its protection guidelines.
Termite is offline   Reply With Quote
Old 05-24-2009, 08:39 AM   #4
Electrical Contractor
wirenut1110's Avatar
Join Date: Apr 2008
Location: Chester, VA.
Posts: 1,054
Rewards Points: 510
Send a message via AIM to wirenut1110

Originally Posted by kenmac View Post
It may also need to be grounded
Yes, in VA., CSST needs to be bonded to the grounding electrode system with no smaller than #6 copper.
wirenut1110 is offline   Reply With Quote
Old 05-24-2009, 11:00 PM   #5
Registered User
Termite's Avatar
Join Date: Apr 2008
Posts: 6,520
Rewards Points: 2,000

And depending on the brand of CSST, it may need the bonding jumper to provide continuity at each fitting. Unfortunately this is loosely enforced in a lot of areas and it presents a very real safety hazard especially with lightning strikes.
Termite is offline   Reply With Quote
Old 05-25-2009, 07:43 AM   #6
Join Date: Apr 2009
Posts: 203
Rewards Points: 150

The only thing I would run in a wall is black iron pipe. But that is just me. I don't care what the plumbing code allows to make it easier. When i go to heaven I want to go the old fashion way not because I wanted to save a few bucks.


al's sewer is offline   Reply With Quote

gas pipe

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
GFCI question: can line and load wires be run inside the same conduit? thegonagle Electrical 32 04-16-2009 06:07 PM
ground wire in rigid conduit measure thrice Electrical 3 02-03-2009 05:25 AM
#3 AWG Copper SER / PVC Conduit Question djejay75 Electrical 4 12-11-2008 11:40 PM
Some walls rattle in my house if hit with something, I will explain inside posting zincmann Building & Construction 4 11-10-2008 03:05 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1