Many St. Louis homes have at least one water line in a space the furnace does not heat well. Basements with exterior walls, attached garages, crawlspaces, and rooms built over a bump-out can all get cold enough to freeze a pipe during a hard cold snap. A frozen line can split, and the damage often shows up only after the ice melts. Most freeze problems in St. Louis homes are predictable, and a short walk-through each fall can catch them before the first deep freeze.
Find the lines most at risk
Start in the basement or crawlspace with a flashlight. Look for supply lines and drains that run along outside walls, through rim joists, or near foundation vents. Those spots lose heat fastest. Pay attention to any line that passes through a garage wall or an unheated storage area, since a closed door does not keep out cold air. Also check where the main water shutoff is, and make sure you can reach it without moving boxes.
Seal gaps and add insulation
- Fill gaps around pipe penetrations with caulk or expanding foam where cold air enters the house.
- Wrap exposed supply lines in foam pipe sleeves, especially along exterior walls.
- Insulate the rim joist area near the lines, since it is one of the coldest parts of a basement.
- If you add heat tape, use a product made for pipes, follow its label directions, and plug it into a properly protected outlet.
Handle cabinets and faucets during a cold snap
When the forecast shows a hard freeze, open the doors of cabinets under sinks that sit against exterior walls. This lets warm room air reach the pipes. You can also let a faucet trickle on the coldest nights. Moving water is much less likely to freeze than still water, and the trickle helps relieve pressure in the line if a small ice plug forms.
Protect outdoor taps and hoses
Disconnect garden hoses and store them indoors before the first freeze. If your home has a valve inside that feeds an outdoor spigot, turn that valve off, then open the outdoor faucet so the water drains out. Leave the outdoor faucet open through the winter if your home design calls for it. Use a foam cover over the spigot if you want an extra layer of protection.
Check the reverse osmosis and water treatment equipment
If a reverse osmosis unit, storage tank, or filter housing sits in an unheated garage or a cold basement corner, check that it stays above freezing. Plastic housings and tanks can crack when the water inside freezes. If the equipment is in a cold spot, consider moving it to a warmer area, adding insulation around the tank, or asking whether the space can be heated. Also look at any drain line that runs outside or along a cold wall, since it can freeze and back up.
Check a private well setup
If your St. Louis home uses a private well, check the pump house, well pit, and pressure tank. Keep the pressure tank, controls, and exposed piping out of the cold. Make sure any vent or access cover still closes tightly to keep out drafts and pests, and do not block any ventilation the equipment needs. Check that electrical controls stay dry and warm.
If a line freezes
If water stops flowing from a faucet, the line may be frozen. Open the faucet it feeds so pressure can escape as the ice melts. Use a hair dryer or warm towels to apply gentle heat, starting at the faucet end and working toward the frozen section. Do not use an open flame, a torch, or a heat gun, because these can damage the pipe and nearby materials.
If a pipe bursts
Shut off the main water valve first. Then open a faucet on the lowest floor to drain the remaining water and relieve pressure. Turn off power to any electrical equipment that is standing in water. Call a licensed plumber in the St. Louis area to repair the break, and keep the area dry while you wait. Save photos of the damage for your records.
A simple routine for St. Louis winters
Make the walk-through a fall habit, and repeat the cold-weather steps whenever the forecast drops well below freezing. Keep a flashlight, a hair dryer, foam sleeves, and a little caulk near the main shutoff so they are easy to find. A few minutes of preparation in a St. Louis basement or crawlspace can prevent a much bigger repair later in the season.