To repair a waste pipe leakage, you can follow these general steps:

1. Turn off the water supply to the affected area to prevent any further leakage.
2. Locate the source of the leakage. Inspect the waste pipe to determine where the leak is coming from.
3. If the leak is caused by a loose fitting or joint, tighten the nuts or bolts to secure the connection. Use a wrench or pliers to tighten the nuts, being careful not to overtighten and cause damage to the pipes.
4. If the leak is caused by a crack or hole in the pipe, use a pipe cutter or hacksaw to cut out the damaged section of the pipe. Cut a new section of pipe to fit the gap and join the new section to the existing pipe using appropriate fittings, such as couplings, elbows or tees. Follow the manufacturer's instructions for fitting the new section and make sure all connections are secure.
5. If the leak is caused by a damaged sealant or gasket, remove the old sealant or gasket and clean the area thoroughly. Apply a new layer of sealant or replace the gasket, making sure it is the appropriate size and type for the pipe and connection.
6. Turn on the water supply and check for any leaks. If there are still signs of leakage, turn off the water supply and repeat the repair process until the pipe is completely sealed and the leak is stopped.

It is important to take appropriate safety precautions when attempting to repair a waste pipe leakage. If you are unsure about any aspect of the process or the damage to the pipe is severe, it may be best to hire a professional from Locals4u for assistance.