How to Plumb a Basement Bath Part 1 How to Plumb a Basement Bath Part 1

What You'll Need
Mallet (lead)
PVC pipe (4 inch to 6 inch)
4 inch to 6 inch PVC pipe adapter
Sledge hammer
Drill with cement bores
PVC pipe sealant
T-bend pipe joint

Having a basement bath can be a great thing. Not only does it offer more space with a growing family, but it’s good when guests turn up, too. It’s a project that involves plenty of work and some plumbing expertise. Depending on the set up in the house you might also need to have a sump pump drain system.

Step 1 - Location

The most important thing in locating the basement bath is knowing where the main drain is. You can easily run water lines over distance, but it’s best to have the tub close to the drain, which might well be under concrete. Locate the main drain. To access the drain you’re going to have to take up the concrete. On the floor mark out the route from the main drain to where the drain will be on your basement bath, making a space 12 inches wide. This is where the drain line for the tub will be and you’ll need to take the floor up here.

Step 2 - Digging

To start the process you’ll need to break through the concrete. In order to do this, use a heavy duty drill with cement bores to makes holes just inside the path you’ve marked for the drain. Be especially careful when removing the concrete over the main drain so you don’t puncture the pipe itself. From here you’ll need to use the sledgehammer to break up the concrete within your lines. Be sure to wear heavy gloves and safety goggles when working.

Step 3 - Trench

After removing the concrete you will still need to dig a trench for the drain from the basement bath to the main drain. It needs to have a flat bottom, but should not be level; there needs to be a slope heading downward from the tub to the drain. Use the level to ensure you have an even slope all the way along. To complete this part of the process you need to cut the main drain and add a T-bend. This will let the drain from the tub connect to the main drain. Be aware that this needs to be at an angle so the water flows freely into the drain. Attach the T-bend with PVC sealant and allow to dry fully. You can now run pipe from the T-bend to where the bath drain will sit.

Step 4 - Vent Stack

A ventilation pipe or vent stack helps to equalize the pressure so there’s no danger of the waste water coming back into your basement bath. It’s a simple operation, using pipe from the main drain that runs up inside the wall and exits the house higher up. It should always be topped with a vent cap to prevent it being blocked by debris.

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