"Speedy Jim" wrote in message ...
Brian Barnson wrote:

I recently spent a few days helping a friend install vents in the
plumbing
drain system in a log house he's building. I'd never really thought
about
venting, so when I got home I checked out my venting and discovered that
I
don't have any. This place was renovated, or being rerenovated, by a
couple
that went broke and we bought it from the bank so I don't know what the
plan
was. There's about 35' of 4" ID pipe to the outside wall and on to the
septic tank. All the drains come together within 5' of the other end of
the
pipe. I can easily put a vent pipe through an outside wall but I'm
wondering if it should be at the septic tank end or the other end.
Brian, in Cedar

No vent stack thru the roof??

One vent stack through the roof, but it's part of the old black iron
system which is disconnected. The new plastic system is sans vent.

See this excellent article for an understanding of the venting
function and principles:

http://www.pmengineer.com/CDA/Articl...101269,00.html

Jim

Thanks Jim, that is a good article. I'd been leaning towards venting
the tank end, thinking that a draining tub or a flush was pushing air that
had nowhere to go. It looks like it's the other end near the drains that
needs venting. Care to guess which end involves lying on my back in
the crawl space?
Brian, in Cedar