Under both the IRC & UPC the maximum length of the tailpiece is 24″ vertical from the finished edge of the drain opening to the standing water level in the trap except washer standpipes.

How far can trap be from tub drain?

Plumbing Codes



P-Traps must connect to the same size drain outlet, with a diameter of at least 1.5 inches. The vertical distance from the fixture to the trap can not exceed 24 inches. The horizontal distance from the fixture to the trap should not exceed 30 inches.

How far can you run a drain pipe?





The ICC organization’s plumbing codes state that there should be a vent pipe within five feet of any drain. With your new location 35 feet away from the main stack (which is of course vented), you’re too far away from that one, so you’ll need to tie into another vent stack.

Should a shower drain have a trap?

According to regulations, all shower drains are required to have P-traps. This includes all fixtures connected to a building’s main plumbing system. P-traps are curved pipes installed under showers and drains of all kinds.

How long can a plumbing trap be?

trap, the distance from the weir of the trap to the vent pipe opening “shall not” exceed 30 inches. Now if we look at the IPC we have have a different set of numbers but the concept is the same. 909.1 Distance of trap from vent.

How long can a shower drain be?

A 1.5-inch drain is usually sufficient enough to keep the water moving through the shower without allowing it to get too backed up. However, it will allow some extra water to splash around your feet and the bottom of the tub while showering.

How far can you run a drain without a vent?





If you have 1- 1/4-inch pipe, the horizontal distance of the vent ought to not be more than 30 inches. For a 1- 1/2-inc pipe the vent must be 42 inches away at the most while a 2-inch pipeline must have an optimum distance of 5 feet.

What is the maximum length of a trap arm?

A 2-inch-diameter pipe sloped at 1/4 inch per foot results in a drop equal to the pipe’s internal diameter over a distance of 8 feet: 1/4 inch x 8 = 2 inches (see “Maximum Allowable Trap Arm Length,” above).

How far can shower drain be from vent stack?

The maximum distance from a shower trap arm to a vent is usually 5 feet, though some municipalities may allow up to 8 feet.

How far can a P-trap vent?

Note: The developed length between the trap of the water closet or similar fixture and its vent shall not exceed four feet.



Distance of fixture trap from vent.

Size of Fixture Drain, Inches Distance Trap to Vent
1-1/2 3 ft 6 in
2 5 feet
3 6 feet
4 10 feet

Does trap have to be directly below drain?



It is not ideal to have the p-trap below the the exit drain because water gravity has to force the water out instead of it flowing downwards naturally. They both work and have seen it many times. But essentially anything below already creates its own p-trap- so using another is redundant.

Can you extend P-trap?

Quote from the video:
Quote from Youtube video: So if you notice there's a gap between the tail piece and the pea trap. So we're going to need an extension tail piece installed which is what this is.

What is the minimum length of a trap arm?

The minimum trap arm length is two pipe diameters, as measured from the trap weir to the vent (not between the hubs of the fittings). So a 2” pipe would require a 4” trap arm minimum.

How far away from wall should shower drain be?



Rough-In Dimension Terminology

Toilet Shower/Tub
Discharge/Drain Hole from Back Wall 12 1/2″ 14″
Discharge/Drain Hole (Vertical) 0″ 0″
Fixture (Side to Side Buffer) 15″ to 18″ min 18″ min
Fixture (Front Buffer) 21″ min 18″ min

How do you install a shower drain trap?

Quote from the video:
Quote from Youtube video: Much neater than using a hacksaw much neater nice clean cut okay more cement now we glue this on. Put into our trap. There which it all set and we're ready to put the pilot over. It.

How much fall does a shower drain need?

In a stall shower, the plumbing code requires the floor to be sloped one quarter (1/4) of an inch per foot in order to carry the water effectively to the drain. This slope, according to the TCNA Handbook is called “sloped fill” or commonly known as the pre-slope.

Can a shower drain have too much slope?

That’s right, it is possible to have too much slope in your drain lines. According to Redwood Kardon, a former plumbing inspector, “Over sloped pipes (greater than ½ in. per ft.)

Why does a shower require a 2 inch drain?



A 2-inch pipe is the recommended size because showers have a low threshold for flooding, and a 2-inch pipe helps the water drain faster than does a 1 1/2-inch pipe. So, if you are converting from a tub and shower combination to a shower, you’ll likely have to change the drain pipe size.

Can a shower and toilet share the same drain?

The general answer is that the showers and toilets can use the same drain, but they should not be sharing the same waste trap arm. There are other factors to consider as well, such as whether your drains lead to the main sewer line, or if there are septic tanks that are used in your city or town.

What angle should a shower waste pipe be?

Waste pipes need to be installed sloping down to ensure the water runs the right way. This needs to be a minimum of 10mm fall for every 4m of pipe which can lead to insufficient fall within the floor void under baths or showers (especially under low-level or flush shower trays).