Installing a Backwater Valve

What is a Backwater Valve?

A backwater valve is installed on a property’s main drain line to prevent water damage from occurring in the basement. It is designed as a check valve, allowing water to flow out of the house but not back in, thereby protecting against sewage backups and floodwater.

Water Damage

Water damage can be a devastating event for homeowners, resulting in costly repairs and lost belongings. A backwater valve serves as an invaluable measure against floodwater and sewage backups, preventing water from entering the home through the drainpipes.

How to Install a Backwater Valve

1. Locate the Sewer Main Pipe: The main sewer line is typically located in the basement or crawl space. It is a large pipe, often made of plastic or cast iron.
2. Determine the Valve Placement: The backwater valve should be installed on the main sewer line, just upstream of where the branch lines connect.
3. Prepare the Pipe: Cut the main sewer line using a pipe cutter or saw. Clean and deburr the cut edges.
4. Install the Valve: Apply a liberal amount of pipe joint compound to the inlet and outlet of the backwater valve. Insert the valve into the cut pipe and tighten the bolts securely.
5. Reconnect the Piping: Reattach the branch lines to the main sewer line, using pipe connectors and sealant.
6. Test the Valve: Once installed, test the valve by pouring water into the bathtub or sink. The water should flow out of the house but not back up into the valve.

Benefits of Installing a Backwater Valve

• Prevents sewage back-ups and flooding
• Protects against costly water damage repairs
• Increases home value and marketability
• Provides peace of mind in flood-prone areas