How high conduit off roof? [RE-wrenches]

Thu Aug 25 20:09:36 PDT 2005

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Joel,

Code does stipulate (I do not have it in front of me, but I have seen
the reference) that EMT cannot be installed in areas "subject to
mechanical abuse". I have had inspectors claim that all conduit on the
roof falls under this, as it gets wind, snow and ice (around here),
trees falling on it, people tripping over it, etc.

We check with the local before doing roof conduit. It varies
tremendously, from union shops doing PVC to hacks doing IMC, depending
upon local custom. We do like to make it sturdy though, as it is subject
to a fair amount of abuse over a 25 year life. We typically fasten it
down by attaching wooden (PT) spacers to concrete blocks. Concrete block
holds it in place, off the roof (cooler and better for drainage), but
does not penetrate the roof.

Jeff Wolfe

-----Original Message-----
From: Joel Davidson [mailto:joeldavidson at earthlink.net] 
Sent: Thursday, August 25, 2005 10:33 PM
To: RE-wrenches at topica.com
Subject: Re: How high conduit off roof? [RE-wrenches]

I hope this message gets through. Thank you all for your help and
feedback.

I guess you all agree that the NEC does not specify conduit height (just
fastener spacing). I don't have the UBC handy, but don't recall it
specifying conduit height off the deck. The store-bought supports are
good looking. Allan's PVC stand-offs are a good idea. I've seen 4x4 PVC
downspout pieces used and they look good.

Some installers let the conduit supports just sit on the roof. Others
fasten them with nails, screws or roof mastic.

Interestingly, some Los Angeles inspectors require threaded conduit on
the roof because EMT comes apart when people trip over it.

I guess roof conduit blocks and height are determined by local custom or
whatever works.

Joel Davidson

----- Original Message -----
From: "Keith Cronin" <keith at islandenergy.net>
To: <RE-wrenches at topica.com>
Sent: Thursday, August 25, 2005 5:12 PM
Subject: RE: How high conduit off roof? [RE-wrenches]

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Joel

To the best of my NEC knowledge, there are no restrictions on height
above a
roof surface. There are requirements for supporting the conduits.
It would be recommended to keep them off the roof at least 2 inches, for
maintenance of the roof, and also to mitigate the radiating heating
effect.

Keith Cronin
President
Island Energy Solutions Inc.
270 Kuulei Rd. Suite 106
Kailua, HI 96734
808-262-3268 Tel
808-263-0338 Fax
keith at islandenergy.net
www.islandenergy.net

-----Original Message-----
From: Joel Davidson [mailto:joeldavidson at earthlink.net]
Sent: Tuesday, August 23, 2005 3:50 PM
To: RE-wrenches at topica.com
Subject: How high conduit off roof? [RE-wrenches]

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Wrenches,
Some installers mount conduit on 4x4 blocks. Some use 2x4 blocks. Some
use
store-bought conduit supports. Does the NEC specify how high of the roof
conduit has to be?
Joel Davidson
[Non-text portions of this message have been removed]

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