Frost Heave in Ottawa: Protecting Your Property

# Frost Heave in Ottawa: Protecting Your Property

Frost heave occurs when water in soil freezes and expands, pushing structures upward. Ottawa winters make this significant concern.

Affected structures include concrete slabs and patios, walkways and driveways, fence posts, deck footings, and shallow foundations.

Prevention starts with proper drainage. Water near structures freezes and expands. Grade away from foundations. Ensure functioning gutters and downspouts.

Proper footing depth is essential. Ottawa frost line is approximately 4 feet. Footings must extend below this depth.

Gravel base under slabs promotes drainage. 4-6 inches of compacted gravel allows water to drain rather than accumulate.

Slab isolation joints allow movement without cracking. Proper joint spacing accommodates expansion and contraction.

Post installation for decks and fences requires depth below frost line. Concrete tube forms extending 4 feet down prevent heaving.

Repair options for heaved concrete include mudjacking to raise settled sections, polyurethane injection for lighter lift, or replacement for severely damaged slabs.

Timeline matters. Heave happens in winter, settling in spring. Damage often appears as cracks in spring.

New construction should address frost concerns from start. Retrofitting is expensive. Prevention is cheaper.