pipe on flat roofs

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Mattaman

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I am working on a building that has an air conditioner right in the middle of the roof, and I need to pipe to it. The roof is a flat rubber one. How high does my conduit have to be above the roof? Can it be mounted to the roof, aor do I need to use some kind of stand off?
 
You only need 1/4" gap per code, but there are many, many premanufactured assemblies for running pipe and racks of pipe across a flat rubber roof. The old-school way is chunks of 4x4 pressure treated lumber laid on the roof at intervals, and the pipe fastened to that.
 
Saw some on counter display at the suppply house the other day that were made from recycled rubber. They looked like short black parking lot parking bumpers. They weighed a ton. I'd hate to have to carry 20 of those up through a scuttle hole onto a roof. The E Blocks I linked to nest into each other, so you can easily carry 10 or 20 at once if you wanted to.
 
Don't forget to derate for a higher ambiant temp. The conduit on a black rubber roof will be a lot higher. As per 310.10
 
Mattaman said:
I am working on a building that has an air conditioner right in the middle of the roof, and I need to pipe to it. The roof is a flat rubber one. How high does my conduit have to be above the roof? Can it be mounted to the roof, aor do I need to use some kind of stand off?
Click to expand...

Bring it up through the roof curb, or call the owners roof Guy... for anything other

And your run conduit, level the pipe for the plumber :rolleyes:
 
I would take a look at these:

PH2301w.jpg


They're light weight and have integral straps.


The link:

http://www.erico.com/products/caddypyramid25m.asp
 
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