How Does Winter Ice Affect a Foundation's Integrity?

When water seeps into tiny cracks in your foundation and freezes, it expands with enough force to widen those cracks. Over a winter with many freeze-thaw cycles, the repeated expansion and contraction can turn a hairline crack into a structural issue. The soil around your foundation also holds moisture; when that freezes, it can push against the concrete or masonry and cause bowing or shifting.

Ice dams on your roof add another layer of risk. When melting snow refreezes at the eaves, it can back water up under shingles and down the exterior walls. That water can pool against the foundation and freeze, adding pressure and moisture where you least want it. The result is often a foundation that looks fine in late fall but shows new cracks by early spring.

Keep gutters and downspouts clear of leaves and ice so melting snow drains away from the house. Extend downspouts at least a few feet from the foundation to reduce the amount of water that pools at the base. Inside, make sure the ground around the house slopes away from the walls, so surface water does not sit against the concrete.

If you live in a region with wet, mild winters, paying attention to drainage is especially useful. You can also seal small cracks with a masonry caulk designed for foundations, but larger cracks need a professional look. For any signs of water entry, consider a water damage inspection to identify the source before ice makes it worse.

• Clean gutters and downspouts before the first freeze
• Extend downspouts away from the foundation
• Check that soil slopes away from the house
• Seal hairline cracks with masonry caulk
• Keep snow from piling up against the foundation

After a winter of ice, take time in early spring to inspect your foundation for any changes. Look for new cracks, check that doors still close smoothly, and feel for dampness in the basement. Keeping a log of what you see each year helps you notice gradual shifts that might otherwise go unnoticed.

Regular maintenance, like re-caulking around windows and doors and keeping vegetation trimmed away from the house, also reduces moisture problems. If you ever need to address water damage from ice, the pros can help with everything from drying to repairs. The cost of foundation repair varies, but it often ranges from a few hundred to several thousand dollars, depending on the extent of the damage and the type of foundation.