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toddmanqa 04-04-2012 03:01 PM

Still OK to use iron pipe for venting?
I'm going to be running a vent pipe from a basement bathroom up to the roof. I'd like to use iron pipe for the venting so as to avoid the possibility of somebody putting a nail or drywall screw into the pipe and allowing sewer gas to escape into the house.

Is iron pipe still allowed for venting?


bob22 04-04-2012 03:29 PM

Just a sample: 4" x 10' cast iron at Lowes: $82; 4" x 10' PVC $4.35.
Add in the weight and supports you'll need, plus cutting and joining sections, transitions to other waste laterals, I'd go with PVC. How likely is the nail/screw penetration danger? Pipe should be protected from those in any case when installed unless you live in a dart or nail gun testing place. THe iron will be quieter though if that is a consideration.

oh'mike 04-04-2012 03:32 PM

Cast iron is still acceptable here--and our codes are very restrictive---However,Your location is missing---check the local codes--most are available on line from your local building department.

Seems like a lot of work and expense to prevent such a rare and unusual event---but if it makes you happier about your home---go for it!

toddmanqa 04-04-2012 03:48 PM

I'm in Albany, NY.

I'm aware that I have to add metal plates where PVC pipes pass through studs/plates. But, wouldn't a nail or screw go right into the PVC where the pipe wasn't studded/protected?

And I've added my location to my profile.

rossfingal 04-04-2012 04:05 PM

Usually, a nail/screw through drywall/plaster will glance off of iron pipe.
Through a stud - different story.
In fact - a nail/screw through drywall/plaster will "usually", just glance off
of "PVC".
Unless, it's "perfectly" lined up -
that's happened!


TheEplumber 04-04-2012 05:29 PM

199 Attachment(s)
You can vent above ground with cast iron, gal. steel, copper or your locally approved plastic. Take your pick. I'd choose plastic and nail plates.

Alan 04-04-2012 10:03 PM

Another vote for plastic here.

If it was a waste line, you could be a little more worried about it. Screw goes in, seals hole.

In a vent, it will probably stay sealed for 100 years. The excessive water and other fluids in a waste pipe corrode the screws and then when they rot out you have a leaker.

Plastic is fine. Everyone is doing it. :wink:

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