Preparing your home for winter involves several key tasks, and knowing how to drain outdoor water pipes is essential to prevent costly damage. When water remains inside exposed pipes, freezing temperatures can cause expansion, cracks, and ruptures that lead to leaks once the weather warms.
This guide walks you through the process step by step, from preparation methods to post-winter checks. By following these practices, you can protect your plumbing system and avoid surprise repairs in the spring.
| Method | When to Use | Pros | Cons |
|---|---|---|---|
| Manual Drain with Shutoff | Accessible indoor shutoff located | Low cost, simple control | Relies on gravity and accessible valves |
| Compressed Air Blowout | Long runs, multiple fixtures, low point access | Effective for complex layouts | Requires equipment and caution |
| Automatic Drain Valve | Irrigation lines and vulnerable low points | Hands-off protection year after year | Initial installation cost and maintenance needed |
| Insulated Pipe Wrap | Pipes in unheated spaces where draining is incomplete | Reduces freezing risk, reusable | Less effective if water remains inside |
Outdoor Hose Bib Preparation
Begin by addressing exterior hose bibs, which are often the most exposed fixtures in a home’s plumbing. Disconnect and store all hoses, then close the interior shutoff valve that feeds each bib. Open the outdoor faucet briefly to release residual pressure and let any remaining water drip out before turning the handle to the open position.
Draining Interior Lines to Exterior Fixtures
After handling the hose bibs, move indoors to drain the connecting lines that run through walls or under foundations. Locate the corresponding shutoff valves inside the home, turn them off, and open the outdoor faucets again. Allow the lines to drain fully, using gravity to clear water from horizontal runs and prevent pockets of moisture that could freeze.
Draining Irrigation Systems Completely
For homes with underground sprinkler systems, a simple faucet drain is not enough. Turn off the main water supply to the irrigation controller, open manual drain valves or use compressed air to push water out from low points. Check risers, valves, and above-ground components, then reassemble the system once it is dry to reduce the risk of cracked heads and buried pipes.
Protecting Low Points and Hidden Runs
Hidden pipes under slabs, in crawl spaces, and near exterior walls require special attention because they are hard to access. Use compressed air blowout techniques or install low-point drains where possible. Combining airflow with insulation on vulnerable sections helps manage spots where complete drainage may be difficult.
Key Winter Plumbing Preparation Steps
- Turn off exterior water supplies and open faucets to drain remaining water.
- Use compressed air for thorough clearing of interior lines leading outside.
- Install and test automatic drain valves on irrigation and low-point lines.
- Insulate exposed pipes in unheated areas to protect against residual cold.
- Schedule a professional inspection if you are unsure about hidden pipe routes.
FAQ
Reader questions
What if I cannot find the interior shutoff valve for my outdoor faucets?
Locate the main water supply line entering your home and look for a nearby valve; if none exists, you may need to shut off the entire house water supply at the meter or contact a plumber to add a dedicated valve for easier seasonal draining.
How do I know if compressed air has cleared all water from the lines?
Continue blowing air through each fixture until the flow is consistent with no spluttering or water droplets, and visually inspect accessible sections of pipe for remaining moisture to ensure thorough drying.
Can leaving water in pipes during mild winters be safe?
Even in mild climates, sudden temperature drops or unexpected freezes can occur, so draining pipes remains the safest strategy to prevent unexpected pipe bursts and water damage.
How often should automatic drain valves be tested for outdoor irrigation systems?
Test automatic drain valves at least once per year before winter, and replace or clean any filters and washers to maintain reliable operation and prevent stuck or leaking valves.