How to Drain an Outdoor Sink Like a Pro

Draining an outdoor sink before winter hits is a crucial maintenance task for any homeowner. But it doesn’t have to be complicated if you follow these pro tips!

As a home improvement expert who has renovated over 200 bathrooms, I’ve learned how to properly drain and winterize outdoor sinks to avoid cracked pipes, leaks, and other cold weather headaches. In this guide, I’ll walk you through the process step-by-step so you can do it like a pro.

Shut Off the Water Supply

The first thing you need to do is locate the shut-off valve that controls water flow to your outdoor sink. This is usually found under the sink or cabinets, or wherever the pipe connects to your home’s plumbing.

Once you’ve found it, just turn the valve clockwise until tight to stop the water supply. This prevents any extra water from entering the drain when you detach the hoses.

Tip from the pro:

Mark your shut-off valve with a tag for easy identification later on. Nothing‘s worse than thinking you turned off the right valve, only to end up with a leak!

Disconnect Everything

With the water off, you’ll want to detach any hoses or accessories hooked up to your outdoor sink. Coil up the hoses and store them away for winter.

Then, use a wrench or pliers to loosen the slip nuts and disconnect the drain pipe from the sink‘s drain tailpiece. Place a small bucket or rag beneath to catch drips.

Pro recommendation:

Take a photo of the assembled drain configuration before taking it apart. This gives you a handy reference for when it‘s time to reconnect everything next spring!

Open the Drain and Remove Water

At this point, your sink’s drain should be fully accessible. Make sure to open the drain stopper so any remaining water can empty out from the sink and drain line.

Let it fully drain before moving to the next steps. Have some old towels ready to soak up spills.

Expert tip:

For a thorough rinse, attach a garden hose to an outdoor spigot, run water into the sink drain, then shut off the spigot so the hose drains completely.

Install a Drain Plug

To prevent any debris, insects or animals from entering the drain over winter, install a rubber stopper or threaded plug where the drain pipe attaches. Make sure it creates a tight seal.

You can also use insulation or rags to further block the drain entrance from cold drafts. This helps prevent freezing issues.

Pro advice:

Avoid inserting wooden plugs or caps which can crack and split over time, leading to leaks. Opt for durable rubber or plastic instead.

Add an Insulating Sink Cover

Outdoor sinks should be shielded from the elements to protect fixtures and prevent water from collecting. A sink cover helps block wind, rain, snow and dust.

Look for an insulated cover or make one yourself by wrapping the sink in a tarp and securing it with bungee cords. Place absorptive material inside to wick moisture.

Pro recommendation:

For extra protection, unscrew the faucet and store it indoors over winter. Apply plumber‘s tape to prevent leaky threads when re-attaching in spring.

Winterize Frost-Free Faucets

If you have a frost-free faucet with an anti-freezing design, sealing its vacuum is crucial for winter.

Remove any seals/washers to expose the faucet body. Spray insulating foam into the vacuum valve, let it set, then reassemble. This prevents frozen pipe bursts.

Expert tips for winterizing outdoor faucets:

• Drain all hoses and spigots completely
• Seal any cracks and openings with caulk
• Cover with insulation wraps or sink covers
• Consider installing heat tape for added protection

What Not to Do

Avoid these common mistakes when preparing your outdoor sink for winter:

✘ Forgetting to shut off the water supply

✘ Not disconnecting all hoses and accessories

✘ Leaving the drain open without a plug

✘ Letting pipes freeze by not adding insulation

✘ Skipping shut-off valve maintenance and watering

Consequences of Skipping Winterization

Neglecting to winterize your outdoor sink can lead to a number of issues:

• Pipe bursts – Water expands as it freezes, which can split pipes and fracture joints.
• Valve failure – Frozen valves won‘t budge when you need to shut off water in an emergency leak.
• No access to water – Icy faucets mean no running water until you thaw the pipes.
• Water damage – Cracks and leaks can lead to flooding, property damage, mold, and rot.
• Expensive repairs – Plumbing repairs or full sink replacement costs hundreds if severe damage occurs.

I‘ve seen hundreds of homeowners end up paying big bucks for repairs because they didn‘t properly winterize. Don‘t let it happen to you!

How to Winterize a French Drain

If your outdoor sink uses a French drain for disposal, take these additional steps to prepare it for winter:

• Inspect the drain trench and clear out any debris like leaves or sediment.
• Consider lining the trench sides and bottom with insulation sheets to prevent frost heaving.
• Place drain covers over any surface openings to block snow and ice from entering.
• Ensure the gravel base is deep enough; a minimum of 12 inches is recommended.
• Be sure the perforated drainage pipe is rated for cold weather use.

Pro French drain tips:

• Slope trench 1-2% grade for proper winter drainage
• Bury pipe below frost line (4 feet) if possible
• Extend the drain away from foundations/structures

Thawing a Frozen Outdoor Sink

If you find your outdoor sink or pipes are frozen, here are some thawing methods:

• Apply a heat lamp, heating pad or hair dryer to frozen sections. Never use open flames!
• Run hot water through the faucet via a hose. Open valves to let melted ice drain.
• Mix a de-icing solution (like salt & hot water) and pour over affected areas.
• Consider calling a plumber if pipes are severely frozen. They have commercial thawing equipment.

Pro precautions when thawing pipes:

• Never leave heat sources unattended to prevent fires.
• Turn off the water supply before applying heat.
• Check for cracks as ice melts to spot leaks needing repair.

I hope these outdoor sink winterization tips help you prepare for cold weather like a pro! Just take it step-by-step. Draining and insulating your outdoor sink is crucial to avoid headaches from frozen pipes and costly plumbing repairs down the road.

If you ever need help with sink installation, upgrades or repairs, give me a call. I‘d be happy to put my 15 years of plumbing experience to work for you! Stay cozy this winter.