The most likely water pipes to freeze are those on outside walls, in crawl spaces and attics. Frozen pipes can freeze and crack easily, leading to flooding and expensive repair costs. Suspect a frozen pipe if no water comes out of the nearest faucet. If you have access to the pipes underneath your house, you can try to locate the frozen section. Typically, you can find the plug of ice by running your hand along the pipe. If the pipe is intact and you want to try thawing it yourself, the thawing process must be gradual. Be especially careful with plastic Pipes. To thaw the frozen section, open the faucet that is nearest to the frozen pipe; this will allow the water to drain out as it thaws. Use a blow dryer or hot towels to gradually thaw the frozen section. If you see a split or crack, or your pipes are positioned behind walls, ceilings or Floors, you should contact a plumbing professional. Consult a plumber in your area about pipe insulation, which is the best prevention of frozen pipes.