How to fix a bathtub drain that leaks under the tub?

 
Inspecting the Leak and Gathering Tools
 

• Examine the area under the tub where the drain pipe connects to the drain assembly. Look for corrosion, worn-out gaskets or improper connections that could be causing the leak.
• Gather the necessary tools such as an adjustable wrench, screwdrivers, a drain wrench, replacement gaskets or seals, plumber’s putty, and possibly a hacksaw if you need to remove any corroded parts.
• Ensure the area is dry and well-lit so you can clearly identify any signs of damage or water seepage.

 
Shutting Off Water and Ensuring Safety
 

• Before beginning work, turn off the water supply to the tub to prevent any risk of water damage or shock during the repair process.
• Drain the bathtub completely by removing any remaining water, which may involve using a bucket or a wet/dry vacuum if water remains stagnant.
• Wear protective gloves and, if necessary, goggles to safeguard against any debris or sharp edges that might be encountered during disassembly.

 
Removing the Drain Assembly
 

• Locate the drain cover and remove it. Depending on your bathtub model, this may require unscrewing a set screw or gently prying off the cover with a flathead screwdriver.
• Once the drain cover is off, you will typically see a locking ring or a series of screws that secure the drain assembly in place. Use an adjustable wrench or a drain tool to loosen and carefully remove these components.
• Support the drain assembly as you remove it to prevent any parts from falling and getting lost inside the tub or plumbing system.

 
Identifying and Replacing Faulty Components
 

• Inspect the drain assembly components such as the rubber or neoprene gasket. Look for signs of deterioration like cracks, flattening, or hardening which can cause leaks.
• If the gasket or washer appears damaged, remove it and purchase a replacement that matches your tub’s specifications.
• Examine any other seals and the connection between the drain assembly and the drain pipe. Corrosion or a poorly seated component may necessitate cleaning or replacement.

 
Cleaning and Preparing the Connection Surface
 

• Thoroughly clean the surfaces where the new gasket or seal will be seated. Use a suitable cleaner to remove old plumber’s putty, soap scum, or rust.
• Smooth out any rough edges on the drain flange or connecting pipes to ensure a good seal when reassembled.
• If needed, lightly sand the areas to improve adhesion of the new seal or plumber’s putty.

 
Reassembling and Sealing the Drain
 

• Apply a thin, even layer of plumber’s putty or a compatible sealant around the drain opening to ensure that once the gasket is in place, it creates a watertight seal.
• Install the new gasket or washer into the drain assembly.
• Carefully position the drain assembly back into the opening and hand-tighten the locking ring or securing screws before using the wrench to provide a snug, leak-proof fit. Avoid over-tightening, which can compress or damage the new gasket.

 
Testing the Repair
 

• Turn the water supply back on and slowly fill the bathtub to about half capacity, checking underneath for signs of leakage at the drain connection.
• If no leaks are observed, drain the tub completely and inspect once more under dry conditions to ensure the repair holds.
• If a slight leak persists, try tightening the assembly a bit more or reapplying sealant as necessary. Repeat the test until the drain leak is fully resolved.

For homeowners and property managers working on plumbing repairs in St Louis and Nashville, these steps offer a straightforward guide to ensuring leak-free installations.

 
Final Steps and Maintenance Tips
 

• Replace the drain cover once you have confirmed that the leak is fixed.
• Keep an eye on the repaired area over the next few days to ensure that no slow leaks develop.
• Schedule periodic checks of all drain indicators, especially in older tubs, to catch and repair any wear and tear before it causes further damage.