Standard Toilet Drain Size

Waste drain pipes for toilets in modern plumbing systems are either 3 inches or 4 inches in diameter.

Standard toilet drain size.

Standard toilet rough in common rough in sizes the standard toilet rough in is 12. In most homes pvc drain pipe is used instead of metal pipe. Ideally 8 1 4 inches above the floor. Measured from centerline running vertically through the center of the toilet supply line hole should be 6 inches to the side of centerline.

10 and 14 are also possible and you ll have a smaller selection of toilets that fit those sizes. If your home has one or two toilets the standard toilet sewer pipe size is 3 inches. The standard size for a toilet drain pipe is 3 inches in diameter but drains up to 4 inches in diameter are often used. This information can be found on the toilet s specification sheet.

There are however other rough in sizes. The most important of these measurements is the distance between the floor drain and the wall called the rough in. Toilet rough in details. Cold water only pipe creates one hole between 5 and 10 inches above the floor supply line horizontal.

The wider the pipe the more waste it can move and the. Minimum 15 space should be left between the center of a drain and finished side wall. I d say 80 of toilets have a 12 rough in so don t be surprised if you do as well. These plans call for 3 inch diameter pvc pipe for the main drain and the short length leading from the toilet to the drain and 2 inch pvc for the other drain lines and the vents.

Check toilet to confirm location water supply connection. 12 inches is the most common toilet rough in size. What size are toilet waste drains. Toilet rough in.

Always check local plumbing codes before you begin a plumbing project. However it s useful to know that toilet s also come in. But most residential floor mount toilets require one foot 305 mm drain placement from the back wall. Local codes may call for a 4 inch main drain and some plumbers prefer to run larger vent pipes.

It s important to know that this measurement is for standard toilets with a 12 rough in. The standard rough in dimensions for toilets is 12 inches but a distance of 10 or 14 inches is occasionally found in small bathrooms or older homes.