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

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-23-2010, 07:48 PM   #1
Newbie
 
Join Date: Feb 2010
Posts: 1
Rewards Points: 0
Share |
Default

How to install conduit in concrete slab


I am about ready to pour a slab for a new wood shop. I want to install a circuit of outlets in the floor. I am also installing a hydronic radiant floor heating system. The 4" slab is laid over 2" pink foam insulation. My questions are 1) is there a problem with installing the circuit in the slab with the radiant tubing (it will all be in 3/4 pvc conduit) and 2) can I lay the conduit directly on the insulation or does it have to be off the insulation and completely encased in concrete. The boxes require 3" in concrete and if I attach to the re-enforcing wire I will only have 2".

mthabault is offline   Reply With Quote
Old 02-24-2010, 08:11 AM   #2
Member
 
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 6,946
Rewards Points: 0
Default

How to install conduit in concrete slab


My guess is that the conduit must be completely encased in concrete. Or rather the concrete surfaces, both top and bottom, must not have grooves running along them where pipes ran otherwise the concrete is subject to cracking along those lines.

__________________
Stop wasting time re-adjusting the pattern. Have several lawn sprinklers, one for each pattern.
AllanJ is offline   Reply With Quote
Old 02-24-2010, 09:44 AM   #3
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 7,585
Rewards Points: 4
Default

How to install conduit in concrete slab


On commercial jobs the conduit is below the insulation and mesh reinforcement.
__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is offline   Reply With Quote
Old 02-24-2010, 10:11 AM   #4
Love for Construction
 
<*(((><'s Avatar
 
Join Date: Mar 2009
Location: Idaho
Posts: 318
Rewards Points: 0
Default

How to install conduit in concrete slab


Quote:
Originally Posted by Jim Port View Post
On commercial jobs the conduit is below the insulation and mesh reinforcement.
x2, usually plumbing and electrical are ran before the sand base is put down under the slab.
<*(((>< is offline   Reply With Quote
Old 02-24-2010, 10:57 AM   #5
Member
 
Join Date: Jun 2007
Posts: 3,506
Rewards Points: 0
Default

How to install conduit in concrete slab


Ty it down to the rebar or mesh. If your not using rebar or mesh, run it under everything. It does not need to be encased in concrete.

You are planning like a professional. Running conduit in the slab saves time, money and materials.
Make sure you do the same for the feeder coming from the panel. Stub it up for your sub panel inside. Nice and clean, no LB's. Same for any inside walls. Lay them out and stub up for receptacles, phone lines or CATV. Use the slab for as much as you can. If you use the slab correctly, you will need very little time and material after the structure is up.
J. V. is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Shower Pan and concrete slab plumbing LTempleton Kitchen & Bath Remodeling 2 08-08-2009 12:47 PM
small shed on larger concrete slab djtkach Building & Construction 10 07-23-2009 03:52 PM
PVC underneath the floor (concrete slab) massimo Building & Construction 6 11-19-2008 10:37 AM
lifting up concrete slab ctudan Building & Construction 1 10-28-2008 02:44 PM
cracks in concrete slab causing home sale to fall though! help! bp13 Building & Construction 14 07-04-2007 12:32 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.