Mice have gnawed the drain; what should be done? - briefly
Seal the entry point, install rodent traps or bait stations, and replace or repair the damaged pipe section. Implement regular inspections to prevent recurrence.
Mice have gnawed the drain; what should be done? - in detail
Rodents have damaged a section of the household drainage system. Immediate action is required to prevent water leakage, foul odors, and possible structural damage.
First, isolate the affected pipe. Shut off the water supply to the line, then open a nearby faucet to relieve pressure. This prevents further water intrusion while repairs are performed.
Second, assess the extent of the chewing. Use a flashlight and a mirror or a small inspection camera to locate all compromised sections. Look for bite marks, exposed metal, and any signs of rust or corrosion that may have accelerated after the damage.
Third, remove the damaged segment. Cut out the compromised pipe with a pipe cutter or a reciprocating saw, ensuring cuts are clean and perpendicular to the pipe wall. Dispose of the removed piece in a sealed container to avoid attracting additional rodents.
Fourth, replace the section with appropriate material. For residential drainage, schedule 1‑inch PVC or ABS pipe with a slip‑fit or push‑fit coupling. Apply solvent cement according to the manufacturer’s instructions, allowing the recommended curing time before restoring water flow.
Fifth, reinforce the repair against future gnawing. Install a metal or stainless‑steel sleeve over the new pipe, or wrap it with rodent‑resistant mesh. Secure the sleeve with stainless‑steel clamps to avoid loosening over time.
Sixth, address the underlying infestation. Set snap traps or electronic traps along walls, near entry points, and in the vicinity of the drain. Place bait stations with appropriate rodenticide, following local regulations. Seal cracks, gaps, and holes in the building envelope, especially around utility penetrations, using steel wool, caulk, or expanding foam.
Seventh, verify the repair. Turn the water supply back on, run water through the pipe, and inspect for leaks. Check the drainage performance by flushing the system with a large volume of water and observing the flow rate.
Eighth, schedule periodic inspections. Conduct a visual check of the drainage system every six months, focusing on vulnerable areas such as under sinks, basements, and crawl spaces. Replace any signs of wear before rodents can exploit them.
By following these steps—isolating the pipe, removing and replacing the damaged portion, reinforcing the new installation, eliminating the rodent population, and instituting regular monitoring—the drainage system can be restored to full functionality and protected from future gnawing incidents.