Does a laundry tub need a vent?
All plumbing fixtures—including washing machines—must be vented. Improperly vented drains can be sluggish and noisy, and can emit hazardous fumes. Properly vented drains allow the P-trap to do its job: prevent sewer gases from escaping into your home.
How to Run Drain and vent lines for your DIY bathroom?
You may need another elbow (of any degree) to position the vertical vent where you want it. If the vent wall is opposite the drain line, use a reducing Y and a street elbow. The fittings can be pointed straight at the wall or at an angle, as needed. Start with a length of 3-inch pipe long enough to reach the basement or crawlspace.
Where does the drain line and the vent line go?
If the toilet drain does not connect directly to a vent, you must find another way to vent it. If the drain line runs away from the wall where you want the vent, use a reducing Y and a 45-degree street elbow to point the vent line toward the wall. The horizontal vent pipe runs right next to the closet bend.
What do I need to install drain pipe in my bathroom?
Install a reducing tee and a 45-degree elbow (or street elbow if you need to save room) for both joints. If the pipe will be accessible, install a cleanout on the fitting for the tub; otherwise install a drain elbow instead of a tee.
What to do if your toilet drain line runs away from the wall?
If the toilet drain does not connect directly to a vent, you must find another way to vent it. If the drain line runs away from the wall where you want the vent, use a reducing Y and a 45-degree street elbow to point the vent line toward the wall.
You may need another elbow (of any degree) to position the vertical vent where you want it. If the vent wall is opposite the drain line, use a reducing Y and a street elbow. The fittings can be pointed straight at the wall or at an angle, as needed. Start with a length of 3-inch pipe long enough to reach the basement or crawlspace.
Can a washing machine drain pipe be vented?
NEVER install a washing machine drain pipe and vent like this. Look at MY drawing below. Kevin, the answer is NO.
How big is the vent in a half bath washing machine?
The dashed lines are vent lines and note the one vent line for the half bath is a full-sized 3-inch vent that goes up and through the roof. The pipe that drains the lavatory sink is 3-inch in diameter because that drain line also acts as a vent for the toilet.
If the toilet drain does not connect directly to a vent, you must find another way to vent it. If the drain line runs away from the wall where you want the vent, use a reducing Y and a 45-degree street elbow to point the vent line toward the wall. The horizontal vent pipe runs right next to the closet bend.
