The Impact of the Canadian Winter on Old Pipes: A Prevention Guide

How Canadian Winters Destroy Old Pipes — And How to Prevent It

Every winter, thousands of Canadian households face burst pipes, with repair costs often exceeding $5,000. Older piping is especially vulnerable. This guide explains the science and the prevention strategy.

Why Old Pipes Fail in the Cold

Water expands about 9% when it freezes. Aged galvanized steel and cast iron — common in historic Canadian homes — have corroded walls and rigid joints that cannot absorb that pressure.

The Danger Zones in Your Home

Pipes in exterior walls, crawl spaces, unheated basements, and attics freeze first. Homes with stone foundations are at higher risk due to air infiltration.

Your Winter Prevention Plan

Before the First Freeze

Drain and shut off outdoor faucets, insulate vulnerable runs with foam sleeves, and seal air leaks near plumbing penetrations.

During a Cold Snap

Let vulnerable faucets drip slowly, open cabinet doors to circulate warm air, and never let indoor temperatures drop below 13°C.

If a Pipe Freezes

Shut off the main water valve immediately and call an emergency plumber. Never use an open flame to thaw pipes.

Need urgent help? FindPlumber.ca connects you with 24/7 emergency plumbers across Canada — because frozen pipes don’t wait for business hours.