How much clearance do you need for a P-trap shower?
Plumbing traps are necessary beneath shower drains because they retain a little bit of water that acts as a plug to prevent sewer gasses from backing up into the room. Typically, these traps lie beneath the floor, but if you’re installing shower on a cement slab, such as in a basement, the trap is above the cement slab.
The base must elevate the bottom of shower at least 6 inches. Position the shower pan temporarily on the shower base, and use a pencil to transfer the hole for the shower drain onto the cement slab below. Remove the shower pan. The circular pencil mark serves as your guide for installing the trap and drain.
The trap is usually attached to the end of the tailpiece, and tailpieces are typically between 6 – 8 inches long (though I’ve seen up to 12). So the “standard” height of a trap would be, 6 – 8″ below the fixture. This question doesn’t make sense because you will buy the ptrap and its size depends on the width of the pipe you pick.
First, your P-trap should be located directly below the center of your shower and close to your shower drain. Homeowners who install their P-traps too far away from the drain may experience more odors than what’s normal.
Bottle traps have a horizontal waste water exit with a lower half that unscrews to allow debris and clogs to be removed. Bottle traps take up less room under the appliance than P- or S-traps, making them appropriate for tight spaces. Thes traps catch the first and debris the same way as a p-trap.
P-traps are S-shaped pipe components that keep toxic sewer gases from escaping into your residence. They are required on all plumbing fixtures, including sinks, tubs and showers. Toilets have built-in traps.
Current plumbing codes (IPC as well as MA Plumbing Code 248 CMR 10 for instance) need 1.5 inches to drain for a tub with a shower. The tub can drain at leisure and the shower function when in utilize, with flow-limiting showerheads, fall within the flow rate that a 1.5” drain can handle.
Maximum Distance According to the International Residential Code, the maximum vertical distance between the sink drain and the entrance to the p-trap is 24 inches.
The maximum distance that a P-trap can sit below a drain is 24”, or 2 ft. That does not mean that every plumbing fixture will need the P-trap to sit 24” below, but if your fixture calls for it, it is okay.
The “P” trap SHOULD be directly under the drain, but no more than a few inches off center of it, if conditions require it. NO trap, TWO traps, and/or a 9 foot offset are NOT allowed and if he suggests any of them get a different installer who is a REAL plumber.
2″ Drain Pipe should be centered in a hole (approximately 5″ diameter) in the flooring. The top of the Pipe should be no higher than, and no more than 1/8″ lower than, the top surface of the floor on which the base will be set.
The minimum size for a shower trap drain is 2 inches if it is a new installation. If you are replacing an older shower or tub, you might find that the existing trap and pipe are 1 1/2 inches.