How often should I check the footings and posts on my Calgary deck for frost heave and settling?

You should inspect your deck footings and posts twice annually — once in early spring after frost thaw (April-May) and again in late fall before ground freeze (October-November). Calgary's extreme frost depth and chinook freeze-thaw cycling put more stress on deck foundations than most Canadian cities, making regular inspection essential for catching problems before they become structural failures.

Spring inspection is the most critical because this is when frost heave damage becomes visible. Walk around your deck and look for posts that appear tilted, twisted, or no longer plumb. Check for gaps that have opened between the deck and the house ledger board — this often indicates the deck has shifted away from the house due to footing movement. Look for new cracks in concrete footings or exposed portions of sonotube forms. Use a level against each post to verify they're still vertical, and check that the deck surface feels solid underfoot without bouncing or flexing more than usual.

Signs of footing problems include: posts that lean inward or outward, deck boards that have separated from the house connection, new squeaking or creaking sounds when walking on the deck, railings that feel loose or wobbly, and visible cracks in concrete piers or footings. In Calgary's clay soil conditions, you may also notice the deck sitting higher or lower relative to your house door threshold — this indicates the entire structure has heaved or settled.

Calgary's unique climate factors make footing inspection especially important. Our frost depth exceeds 1.2 metres, meaning footings experience tremendous upward pressure during freeze cycles. Chinook winds create rapid freeze-thaw cycling that can shift footings multiple times per winter — a deck that was perfectly level in November may be noticeably tilted by March. The clay soil common in many Calgary neighborhoods is particularly susceptible to frost heave because clay holds moisture that expands when frozen.

During your inspection, pay special attention to the ledger board connection where the deck attaches to your house. This is the most critical structural connection and the most likely to fail if footings shift. Look for gaps between the ledger and house siding, loose or protruding lag bolts, and any signs of water staining or rot around the connection point. If the deck has pulled away from the house even slightly, this indicates serious footing movement that requires immediate professional attention.

Minor settling (1-2mm) is normal and expected, especially in the first year after construction as the ground around new footings consolidates. However, any post that's moved more than 5mm out of plumb, any visible footing cracks, or any separation at the ledger board requires professional evaluation. Don't ignore these signs — footing problems only get worse with each freeze-thaw cycle.

Professional inspection is recommended every 3-5 years for decks over 10 years old, or immediately if you notice any of the warning signs mentioned above. A structural engineer or experienced deck contractor can assess whether footings need reinforcement, replacement, or if the entire deck structure needs releveling. In Calgary's challenging soil and climate conditions, catching footing problems early can save thousands in structural repairs and prevent dangerous deck failures.

When to call a professional immediately: if any post has moved noticeably out of plumb, if you can see daylight between the deck and house connection, if the deck bounces or feels unstable underfoot, or if you notice any cracking in concrete footings. These are signs of potential structural failure that require immediate attention before the deck becomes unsafe to use.

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