How to fix a leaking drain pipe under concrete?

 
Assess the Situation
 

• Examine the concrete structure to locate the exact position of the leaking drain pipe.
• Determine whether the leak is coming from a crack in the pipe, a joint failure, or damage caused by movements or external forces.
• Evaluate how much of the pipe is affected and whether there is ongoing moisture affecting the surrounding concrete.

 
Gather Tools and Safety Equipment
 

• Assemble the necessary tools such as a concrete saw or chipping hammer, pry bar, wire brush, and putty knife.
• Obtain repair materials like epoxy putty or specialized pipe repair clamps, waterproof sealant, and possibly a section of replacement pipe or coupling if needed.
• Wear protective gear including gloves, eye protection, and a dust mask to ensure safety while cutting or chiseling concrete.

 
Expose the Damaged Section
 

• Mark the area of concrete around the leak ensuring you have an adequate workspace to repair the pipe.
• Carefully remove the concrete overlying the problematic pipe section using a concrete saw or chipping hammer. Work slowly to avoid further damage to the pipe or surrounding structure.
• Keep the removed concrete pieces organized if you plan on reusing them later in the repair process.

 
Clean and Prepare the Pipe Surface
 

• Remove any loose debris or remnants of old sealant from the exposed pipe area using a wire brush or scraper.
• Ensure the area is completely dry and free from dust and oil. Proper cleaning is crucial for the repair material to bond effectively.
• If the pipe has corrosion, consider treating it with a corrosion inhibitor before proceeding.

 
Select the Appropriate Repair Method
 

• If the leak is minor, option for an epoxy putty repair may be appropriate. Mix the epoxy according to the manufacturer’s instructions and apply it evenly over the leak, pressing it into any cracks.
• For larger cracks or more extensive damage, use a repair clamp or a pipe coupling. These fittings are designed to encase the damaged area and create a watertight seal.
• In cases where the pipe section is severely compromised, consider replacing the damaged segment. Cut out the affected portion and install a new pipe section using appropriate couplings and sealants.

 
Apply the Repair Material and Secure the Pipe
 

• Apply a generous layer of epoxy putty or secure the repair clamp tightly around the damaged area. Make sure to smooth out the edges to avoid any uneven surfaces which might contribute to future leaks.
• If using a repair clamp, follow the manufacturer’s tightening recommendations to ensure a balanced pressure is applied evenly across the pipe surface.
• Allow the repair material to cure fully. This curing period can vary from several hours to a full day depending on the product used.

 
Test the Repair Before Restoring the Concrete
 

• Slowly reintroduce water into the system to see if any leaks persist. Monitoring the repair site for moisture or signs of seepage is crucial.
• If any minor leaks remain, address them immediately by applying additional sealant or by re-tightening the repair clamp.
• Confirm that the repaired pipe can sustain normal water pressure without recurring leaks.

 
Restore the Concrete Covering
 

• Once the repair has been successfully tested and the pipe is dry, prepare the removed concrete pieces or mix fresh concrete to patch the area.
• Fill in the gap where the concrete was removed, compacting the material as you work to avoid future settling or cracks.
• Finish by smoothing the surface to match the surrounding area. Allow the concrete to cure as per standard guidelines.

 
Final Inspection and Maintenance
 

• Conduct a final visual inspection to ensure that the repair area is stable, well sealed, and that the concrete patch is even with the surrounding surface.
• Observe the repair site over the next few days for any signs of moisture returning.
• Establish a regular maintenance check on the exposed piping systems to catch early signs of possible future leaks.

 

Note: This guide provides a general approach to resolving leaks and maintaining pipelines, applicable for various properties including those in St. Louis and Nashville.