Frozen pipes are a leading cause of winter water damage. When water inside a pipe freezes, it expands and can crack the pipe, leading to leaks when the ice melts. To prevent this, insulate exposed pipes in unheated areas like basements and garages, seal gaps where cold air can reach pipes, and keep your home heated consistently. During extreme cold, open cabinet doors under sinks to allow warm air to circulate. Always know the location of your main water shutoff valve in case of emergencies.