A damaged plastic pipe can cause water leakage or even disrupt the entire system, leading to issues for both you and your neighbors. This article describes the main methods to help you fix a leak in a plastic pipe.
Why Plastic is a Good Choice
Plastic is a general term for materials made from natural or synthetic polymers. “Poly” means “many,” as the molecules of these materials consist of numerous repeating units.
Plastic pipes are made from polyvinyl chloride (PVC), polypropylene, polyethylene, polybutylene, and other polymeric materials. They are used for water supply, heating, gas pipelines, and sewage systems.
Plastic pipes are known for their strength and lightweight properties, making them a reliable choice. They do not rust, do not accumulate mineral deposits inside, retain water temperature in heating and hot water systems, and reduce the noise of water flow.
Causes of Leaks
Leaks typically occur at connection points. Plastic pipes are joined using fittings, such as couplings, adapters, reducers, and collectors.
Leaks can happen due to the following reasons:
At the Joints
- A loose fitting nut
- Incorrect temperature during welding
- Poorly crimped compression fitting
- Uneven pipe cut in a push-fit connection
- Improper adhesive used in glued joints
On a Straight Pipe Section
- Accidental drilling during home repairs
- Hydraulic shock due to sudden pressure changes
- Impact from a heavy object, such as a hammer
- Natural wear and tear of the pipe
Quick Ways to Stop a Leak
- Seal the hole with “cold welding” adhesive
- Wrap with a sealing tape
- Apply a layer of sealant glue
If the leak is not at a joint, a pipe clamp with screw fasteners and a rubber gasket can be a solution.
Cold Welding Adhesive
Cold welding consists of resins, hardeners, and fillers that make it as strong as metal once cured. It can be applied to both dry and wet surfaces, but they must be clean and degreased.
To use it:
- Cut off a piece of adhesive.
- Knead it with wet fingers until it becomes warm and pliable.
- Press it onto the leak area.
The adhesive sets in 30 minutes, but full curing takes 24 hours.
Warning! If the leak persists, removing cold welding adhesive can be difficult.
Self-Adhesive Sealing Tape
Wrap the damaged section with 5–6 layers of sealing tape. This fix will last 3–4 months. Before applying, clean and degrease the pipe with an alcohol solution.
Sealant Glue
Use a neutral-type sealant, as acidic ones can damage plastic. Any brand labeled “universal” will work.
To apply:
- Turn off the water.
- Clean, dry, and degrease the pipe and fitting with alcohol.
- Apply a 1–2 mm layer of glue.
The glue dries in 15–20 minutes, but a 2 mm layer takes 24 hours to fully cure. Avoid running water through the repaired area until the glue has completely dried.
Other Methods to Fix a Leak in a Plastic Pipe
- Using a pipe clamp
- Applying a glue bandage
- Completely replacing the leaking pipe section
Pipe Clamp
If the leak is on a straight section of the pipe, a pipe clamp can be used. This special device, equipped with a rubber gasket, ensures a tight seal. The main advantage of this method is its speed, but the downside is that it is not a permanent fix.
Glue Bandage
Another option is a glue bandage, which is applied as follows:
- Clean the pipe with a solvent, acetone, or similar product.
- Soak fiberglass cloth in adhesive and wrap it around the damaged area in multiple layers.
- Allow the bandage to dry completely.
Full Pipe Section Replacement
If none of the above methods work, a full pipe section replacement is required. This is a more advanced repair that requires special tools and skills.