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Fall maintenance: Freeze-proof faucets

Published On: Aug 13 2013 10:16:44 AM CDT
Updated On: Aug 28 2013 09:52:28 AM CDT
Washing hands with soap, water

iStock / mayhewphoto

By Philip Schmidt, Networx

If you live in an area with frosty winters, you know the agony of exploding pipes and the pain of preventative maintenance to stop the issue before it starts. Particularly cold cities tend to experience a high rate of plumbing calls in the winter (Minneapolis plumbing companies, for example, do a brisk business in the cold months) from panic-stricken homeowners; don't let that be you!

The best home maintenance tasks are the kind that reduce your overall home maintenance. Installing a freeze-proof faucet is a case in point. This faucet's function is no different from a standard sillcock (a.k.a hose bib, outdoor spigot), yet its clever design saves you from having to turn off the water supply to the faucet and/or put on those silly insulated covers every fall, and you no longer have to worry about the faucet or its supply pipe freezing in the winter. That's one summer-to-fall maintenance item you can permanently erase from your checklist. However, you still have to remove, drain and hang up your hoses.

How a Freeze-proof Faucet Works

Also called freezeless or frost-free faucets, freeze-proof faucets look like regular sillcocks on the outside (where the handle is) but have a long pipe on their back ends. The pipe extends 4 or more inches into the house -- where it's relatively warm in winter -- and connects to the water supply line. The clever part is where the faucet's valve is located: On standard sillcocks, the valve is inside the main body, just behind or under the outdoor handle. On freeze-proof faucets, the handle turns a long stem that runs inside the pipe going into the house. At the house end of the pipe is where the valve actually controls the water flow. When you turn off the water at the handle outdoors, the water inside the pipe automatically drains (thanks to gravity) out through the spout, so there's no water left to freeze inside the pipe. Freeze-proof faucets come in a range of lengths to accommodate different installation configurations as well as varying levels of protection (see Are They Really Freeze-proof?, below).

Most freeze-proof faucets include an anti-siphon device (it's under a little plastic cap above the handle) that prevents contaminated liquids (old hose water, lawn chemicals, etc.) from being sucked back into the water supply. If the water flow from the city stops suddenly, it could create a vacuum that pulls the water the wrong way (not likely, but possible).

There are also freestanding freeze-proof faucets for garden and greenhouse applications. These typically are called hydrants, and they use a similar system as house-mounted freeze-proof faucets, except with hydrants the earth (not the house) provides the warmth to prevent freezing.

Installation Details

Not all houses have the same plumbing parts leading up to the outdoor faucets, but local building codes in most areas require a shutoff valve between the water supply line and the faucet. From there, you'll probably need a short length of pipe (sized to match the faucet pipe) and a female threaded fitting for joining with the male threaded fitting that's standard on freeze-proof faucets. If you have copper pipe, you might be able to use push-in fittings (such as SharkBite) to make the connections, thus avoiding any soldering; just make sure to follow local code. If you do need to solder near the faucet fitting, first remove the valve stem assembly because the heat can melt the faucet's rubber valve seat. With CPVC or PEX pipe, use the appropriate interface fittings to connect to the faucet. If you have galvanized pipe, you'll likely need a dielectric union to transition from the steel to copper to prevent corrosion caused by dissimilar pipe materials.

Apart from making watertight connections inside the house, the most important aspect of installing a freeze-proof faucet is sloping the faucet slightly downward from the water line to the outdoor spout. This allows gravity to drain the water inside the faucet pipe each time the water is shut off. Without the slope, the pipe can remain filled with water and potentially freeze.

Not comfortable doing it yourself? Find a local handyman to help out.

Are They Really Freeze-Proof?

The short answer is: not always. But freeze-proof faucets are reliable enough that they don't have to be called "freeze-resistant" or some other non-committal name that makes lawyers lose interest. Because they require above-freezing ambient air temperatures, the faucets can freeze if it's really cold and one or more of the following conditions exists: 1) the faucet pipe going into the house is too short, and therefore the valve (and the water behind it) is too close to the outside wall; 2) the wall (or rim joist) is not sufficiently insulated; 3) there's a big hole where the faucet pipe goes through the wall, letting in lots of cold air. The solutions are just as simple: seal air gaps with spray foam sealant or caulk, insulate the rim joist or wall area near the faucet, and/or use a faucet with a longer pipe that reaches further into the house.

Source: http://www.networx.com/article/fall-maintenance-freezeproof-faucets

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