How To Fill In A Sunken Bathtub Drain Pipes

A sunken bathtub drain pipe can be a frustrating and unsightly problem. It occurs when the pipe connecting the bathtub drain to the main sewer line sags or settles, creating a dip that allows water to accumulate and potentially even cause leaks. Fortunately, filling in a sunken bathtub drain pipe is a relatively straightforward DIY project that can be accomplished with the right tools and materials.

Understanding the Problem

Before attempting to fill in a sunken bathtub drain pipe, it's important to understand the cause of the problem. Sunken drain pipes typically occur due to:

Soil movement: Shifting soil around the pipe can cause it to sag.
Improper installation: If the pipe was not properly secured during installation, it can settle over time.
Root intrusion: Tree roots can grow into the pipe and cause it to collapse.
Corrosion: Old pipes can corrode and weaken, leading to sagging.

Once you've identified the cause, you can determine the best course of action. If the problem is due to corrosion or root intrusion, it may be necessary to replace the pipe entirely. However, if the pipe is simply sagging due to soil movement or improper installation, filling it in may be a suitable solution.

Preparing for the Repair

Before you begin the repair, gather the necessary tools and materials:

Work gloves
Safety glasses
Utility knife or scissors
Measuring tape
Bucket
Shovel
Level
Concrete mix
Water
Plastic sheeting
Duct tape
Caulk
Caulk gun

Also, take the following steps to prepare for the repair:

Turn off the water supply: Locate the bathtub's shut-off valve and turn off the water supply to the fixture.
Drain the bathtub: Completely drain the bathtub and remove any remaining water.
Protect surrounding areas: Cover surrounding areas with plastic sheeting and secure it with duct tape to prevent any mess from affecting other fixtures or surfaces.

Filling in the Sunken Drain Pipe

Once the area is prepped, follow these steps to fill in the sunken drain pipe:

Identify the sunken area: Carefully examine the pipe to determine the location and extent of the sunken area.
Excavate the area: Using a shovel, carefully excavate the area around the sunken pipe to expose the portion that needs to be filled. Be mindful of any existing utilities or plumbing pipes in the area.
Mix the concrete: According to the manufacturer's instructions, mix the concrete in a bucket. The consistency should be thick enough to hold its shape but not so thick that it's difficult to work with.
Pack the concrete: Carefully pack the concrete mixture into the sunken area around the drain pipe. Use a trowel or a piece of wood to ensure the concrete is packed firmly and evenly.
Level the concrete: Use a level to ensure the concrete is level with the surrounding area. Allow the concrete to cure according to the manufacturer's instructions.
Seal the area: Once the concrete is fully cured, seal the area around the pipe with caulk to prevent any future leaks.

After the repair, carefully remove the protective covering. Turn the water supply back on and check for any leaks. If everything is functioning correctly, you've successfully filled in your sunken bathtub drain pipe.