Will my tub drain properly if I create a P-trap by running it under a 4 inch floor joist?

How far can the p-trap be from the tub drain?

Plumbing codes require P-Traps installed on all wastewater connections. A few specific international code requirements for bathtub installation are: 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.

Does p-trap have to be directly below shower drain?

You attach the p-trap directly to the drainage and manuever the p-traps exits into you existing 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.

How much lower can ap trap be from the drain?

Maximum Distance



However, the Universal Plumbing Code stipulates that the total developed length of all tailpieces, arms and fittings connecting the drain to the p-trap must be 24 inches or less.

How do you p-trap a bathtub?

Quote from the video:
Quote from Youtube video: It's always best to drain the overflow straight down if you can here i have to route around a floor joist and this flex elbow gives me a little more clearance than a solid elbow.

What kind of trap do you use for a bathtub?

Use a P-Trap



The proper size for both a bathtub drain and trap is 1 1/2 inches in diameter, regardless of the bathtub size. The type of trap used on a tub drain is a p-trap. Because they are the same size, the trap will glue directly onto the PVC drain pipe without the use of adaptors or fittings.

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.

How far below a shower can the trap be?

According to the International Residential Code, the maximum vertical distance between the sink drain and the entrance to the p-trap is 24 inches.

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.

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.

Does a bathtub drain need a vent pipe?

Whether you’re putting in a tub, toilet, sink, or floor drain, they all need a plumbing vent on the drain to make it work properly. If there is no vent, a number of problems may occur: The fixture without a vent may drain slowly. The drain will likely make gurgling noises.

How big should a shower P-trap be?

Trap Size. The usual size for a shower drain trap is 2 inches, which is the diameter of the trap. This size is the minimum size that is allowed, which means that you cannot install a trap with a smaller diameter, or the trap is not within code.

Does bathtub drain need vent?

All drains in a home will need a vent, whether they are drains for a bathtub, shower, toilet, or kitchen sink. This is because any fixture that is connected to the sewage lines has the potential to excrete toxic sewage gas, so a plumbing vent is necessary to vent this gas outside of the home.

What’s the difference between an S trap and P-trap?

The only difference between a P-trap and an S-trap is the horizontal length of pipe on the outflow side which allows you to connect the vent. You can turn an S-trap into a P-trap by adding this pipe — it should be at least 4 inches long — and connecting a vent to it.

What size pipe is a bathtub drain?

According to Bonnets Stems and Accessories, Inc., a standard modern bathtub drain is 1 1/2 inches in diameter – the width straight across the middle. Rough-in plumbing should be calculated for a 1 1/2-inch pipe.

What is a running trap?

running trap. A depressed U-shaped section of pipe in a drain; allows the free passage of fluid, but always remains full, whatever the state of the pipe, so that it forms a seal against the passage of gases.

Are running traps allowed?

Full “S” traps, bell traps, drum traps, crown-vented traps, and running traps are prohibited.

When would you use a running trap?

Running traps are best suited for air conditioner condenser drain lines. Since they are sold as a one-piece, you save on fittings, welds, and sealants. Due to their simple design, it can be easily installed, thus saving you on labor costs.

Where would you use a running trap?

Why Did Plumbers Install Running Traps? Usually, sewer main traps were used when the sewer line also linked into the storm drains. They were meant to prevent certain problems, like rats or snakes coming through the pipes, or seepage of unwanted gases into a home.

What is the minimum depth of water seal in floor trap?

50 mm

What is the minimum depth of water seal in floor trap? Explanation: The floor traps are available in cast iron or UPVC material and have removable grating (JALI) on the top of the trap and minimum water depths should be 50 mm.

What is a double trap plumbing?

A double trap is two plumbing traps in tandem, one after the other in line, and this often causes the first trap to get sucked out by the last trap. An example of one sink trap connected to another sink’s trap is shown above.