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??

See this excellent article for an understanding of the venting
function and principles:
http://www.pmengineer.com/CDA/Articl...101269,00.html

Jim