Should I shovel snow off my deck in Calgary or will the weight not cause structural problems?

Yes, you should regularly remove heavy snow accumulation from your deck in Calgary, especially after major snowfalls or during chinook cycles that create dense, wet snow. While properly built decks are designed for snow loads, Calgary's unique weather patterns can create conditions that exceed normal design parameters.

Calgary decks face unique snow challenges that differ from other Canadian cities. Standard snow is relatively light at about 160 kilograms per cubic metre, but Calgary's chinook winds create a dangerous cycle of melting and refreezing that produces extremely dense, wet snow weighing up to 480 kilograms per cubic metre. A 20-centimetre snowfall that melts partially during a chinook, then refreezes, can weigh three times more than the original fresh snow. This wet, heavy snow is what causes structural problems.

The Alberta Building Code requires decks to handle specific snow loads, but these calculations assume normal snow density and gradual accumulation. When you get 30-40 centimetres of fresh snow followed by a chinook that melts the top layer and refreezes it into an ice crust, you're looking at loads that can approach or exceed design limits. Elevated decks, pergolas, and shade structures are particularly vulnerable because they catch and hold more snow than ground-level surfaces.

Remove snow when accumulation exceeds 20-25 centimetres, or immediately after any chinook cycle that creates wet, heavy snow. Use a plastic shovel or snow pusher rather than a metal shovel to avoid damaging deck boards. Push snow off the deck rather than lifting and throwing it — this reduces the load on your back and prevents you from accidentally damaging railings or deck furniture. Never use rock salt or ice melt products on wood decking, as they can accelerate deterioration and void composite decking warranties.

Pay special attention to pergolas and shade structures, which can accumulate dangerous snow loads. The horizontal beams and lattice work of pergolas catch and hold snow that would normally blow off an open deck surface. If you have a pergola or gazebo, clear snow from the top after every significant snowfall. The same applies to deck railings with horizontal elements that can trap snow.

Signs your deck may be overloaded include new creaking or groaning sounds when walking on the surface, doors or windows near the deck that suddenly stick or won't close properly (indicating the house structure is being pulled), visible sagging in deck boards or railings, or gaps opening up between the deck and the house ledger board. If you notice any of these signs, remove snow immediately and have the deck inspected by a professional before using it again.

For composite and PVC decking, snow removal is generally easier because the smooth surface doesn't hold snow as readily as textured wood. However, the same weight limits apply to the underlying structure regardless of decking material. Composite decking is also more slippery when wet, so be extra careful when clearing snow during chinook conditions.

When to hire professional snow removal: If your deck is elevated more than 8-10 feet above grade, has a complex multi-level design, or includes overhead structures you can't safely reach, consider hiring professionals for snow removal after major storms. The cost of professional clearing is minimal compared to structural repairs from snow damage.

Need help finding a deck contractor to assess your deck's snow load capacity? Calgary Deck Contractors can match you with experienced professionals who understand Calgary's unique climate challenges.

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Looking for experienced contractors? The Calgary Construction Network connects homeowners with qualified professionals:

• Amar Homes Inc
• PLATINUM Pool & Spa Services Ltd
• Mike’s Restoration Service
• Premium Built Structures
• Durable Decks