Freeze-Thaw Damage in Calgary: How to Build Hardscape That Lasts
Calgary’s Freeze-Thaw Problem
Water expands 9% when frozen.
If your base holds moisture — your patio will move.
Every winter.
The 4 Must-Do Steps
1. Proper Excavation Depth
Minimum:
-
8–12” base for patios
-
12–18” for driveways
2. Use Road Crush (Not Washed Gravel)
Road crush compacts.
Washed gravel drains but shifts.
3. Compaction in Lifts
Compact every 2–3 inches.
4. Drainage Planning
Slope away from house:
Minimum 2% grade.
Why Most Patios Fail
-
Not enough base
-
Poor compaction
-
No edge restraint
-
No drainage slope
FAQ
How long should a properly built patio last in Calgary?
20–30+ years if installed correctly.