# How much slope should a shower drain pipe have?

Table of Contents

## How much slope should a shower drain pipe have?

To efficiently drain, the recommended minimum slope for a shower floor is about 4 percent, or a 1/2 inch drop per every 12 inches from the shower walls to the drain.

## How much slope does a PVC drain pipe need?

For 4-inch PVC piping and a building sewer less than 50 feet long, the minimum slope is 1 inch in 8 feet, or 1/8-inch per foot, and the maximum is 1/4-inch per foot. For sewers longer than 50 feet, the slope should be 1/4-inch per foot.

## What is the minimum slope for a drain pipe?

1/4″ per foot

It is generally accepted that 1/4″ per foot of pipe run is the minimum for proper pitch on a sewer line.

## What is the standard slope for drainage?

Typically on straight road sections, the drainage gradient is at least 1–3% due to the normal cross slope of 1–3%. In curved sections the drainage gradient is higher, and may often reach 5–12% due to superelevated CS that may reach 5–8% in areas with icy roads and up to 12% in areas without icy roads.

## Can you put a 90 in a sewer line?

The 90 degree bends also are tough to pass through with drain cleaning equipment. Never install a 90 degree fitting under ground except when used at the base of a vertical plumbing stack.

## Can a drain pipe have too much slope?

The ideal slope of any drain line is ¼ inch per foot of pipe. In other words, for every foot the pipe travels horizontally, it should be dropping ¼ inch vertically. That’s right, it is possible to have too much slope in your drain lines.

## What is the maximum slope on a drain pipe?

The maximum slope for efficient drainage is usually a drop of 1/2 inch per 1 foot of horizontal distance. A pipe with a very extreme slope of 45 degrees or more is considered vertical. Vertical pipes, or stacks, drain solids and liquids effectively.

## How do you calculate the slope of a drain?

Example: If the manhole invert elevations are 101.00 for one manhole and 99.00 for the other, then the difference between the two manhole inverts will be 2.0 feet. Take the invert difference (2.0 feet) and divide it by the pipe distance (300 feet). The pipe slope will be 0.0067 feet per hundred feet or 0.67%.

## Does P trap have to be directly below 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.

## Can a drain have too much slope?

The ideal slope of any drain line is ¼ inch per foot of pipe. In other words, for every foot the pipe travels horizontally, it should be dropping ¼ inch vertically. Many drains either have too little slope or too much slope. That’s right, it is possible to have too much slope in your drain lines.

## How many inches per foot is a 2% slope?

The minimum slope that I recommend is two percent, or 1/4 inch per foot. As an example, the grade at a spot four feet away from your house should be one inch lower than the grade next to your house.

## What is a 1% slope in inches?

What is a 1% slope in inches? 1% as a decimal is 0.01 and hence the slope is 0.01. That means for a run of pipe of a certain length the rise must be 0.01 times the length. Thus for you example, since the length of the run is 80 feet which is 80 × 12 = 960 inches the rise must be 0.01 × 960 = 9.6 inches.

## What should the slope of a shower drain be?

Lining up the P-trap so that it is directly under the drain hole will make the installation much easier. A shower drain pipe should have a pitch, or slope, of 1/4 inch per foot. Mark and drill holes in the floor joists according to this slope.

## How big of a slope do I need for a PVC drain pipe?

People usually choose the 3-6 inch diameter pipes. To get the proper slope, you multiply your slope per foot with the total length of your waste line. If the diameter of your PVC drainpipe is larger than 10″ then you will need to measure 1/16″ per foot.

## How big of a hole do you need for a shower drain?

A shower drain pipe should have a pitch, or slope, of 1/4 inch per foot. Mark and drill holes in the floor joists according to this slope. For 2-inch pipe, you’ll want to drill holes that are a little over 2 inches to make it easier to install the pipe. You may need a few couplings if space is tight.

## How big of a shower pipe do I Need?

Some states and cities only require a 1.5-inch shower drain pipe, but you may still want to consider going with the two-inch size. For most standard shower trays and pans, they are already outfitted for a two-inch pipe, so there may not be much of an option. What if I Want a Smaller Drain Size?

Lining up the P-trap so that it is directly under the drain hole will make the installation much easier. A shower drain pipe should have a pitch, or slope, of 1/4 inch per foot. Mark and drill holes in the floor joists according to this slope.

People usually choose the 3-6 inch diameter pipes. To get the proper slope, you multiply your slope per foot with the total length of your waste line. If the diameter of your PVC drainpipe is larger than 10″ then you will need to measure 1/16″ per foot.

A shower drain pipe should have a pitch, or slope, of 1/4 inch per foot. Mark and drill holes in the floor joists according to this slope. For 2-inch pipe, you’ll want to drill holes that are a little over 2 inches to make it easier to install the pipe. You may need a few couplings if space is tight.

Some states and cities only require a 1.5-inch shower drain pipe, but you may still want to consider going with the two-inch size. For most standard shower trays and pans, they are already outfitted for a two-inch pipe, so there may not be much of an option. What if I Want a Smaller Drain Size?