When weather is very cold, water in pipes exposed to outdoor temperatures may freeze. The first sign of this condition is blocked water flow at faucets. If you don't act quickly, pipes may burst.
Finding the blockage may be difficult. At the first sign of a block, open the faucet and follow the supply pipe from there to where the pipe passes near exterior walls or runs outside of heated areas.
Melting the ice is easy, using any of several heating devices: a heat gun, hair dryer, heating pad, heat lamp or--in a pinch--a propane torch (be very careful to shield flammable materials from the flame). Leave the faucet open so water can drain.
After ice has melted and pipes have cooled, prevent them from refreezing by jacketing them with foam insulation sleeves.
Put pipe insulation around all pipes that pass through unheated spaces to protect them from freezing. On outdoor pipes, insulation should extend about 12 inches below the frost line, an imaginary line that represents the average depth at which soil is likely to freeze year after year.
