venting

RWALD

I Know this is not heating related but I figured its worth a shot. My question is if my shower or sink drain is less than 5 feet from my main sewer line do i still need to vent it?

Intplm.

If there are no other fixtures draining from above in the main sewer then maybe not.

There are single fixture vents called sudor vents, or sure vents that can be used.

Your local codes and building department can also help with this question.

Jamie Hall

Sometimes. This is called wet venting and in certain conditions it is permitted -- and the conditions differ with codes, so you will need to check whatever code is in force in your area.

Larry Weingarten

Hi, thinking just of the physics involved, I'd vent it, with something like a Studor vent, which is a brand of air admittance valve. If there is no vent, than you're trusting that the trap will never have the water sucked from it by a pull from the main sewer line, and that seems optimistic. When the water is pulled from the trap, you'll know because of that hard-to-ignore sewer gas aroma

Yours, Larry

hot_rod

another method that was used is called stack venting. All the fixtures on one level were 5’ from a main 3” vertical drain which carried through to the roof. Plenty of air space to vent all the fixtures connected to the “stack”

It depends on the type of DWV system you have, 

rick in Alaska

On the places using the UPC, you can do it, but it depends on what else is connected to than line, and how the vent its tied in. In short, you can run the 2" line five feet before you have to have a vent on it. But, it depends on what else is going on.
Rick

RWALD

Thanks guys I'll vent it