Ontario Winters Are Tough on Decks
With temperatures dropping to -20°C or colder, heavy snow loads, and constant freeze-thaw cycles, Ontario winters pose significant challenges for decks. Proper winter care prevents costly damage and extends your deck's lifespan.
Pre-Winter Preparation
1
Final deep cleaning: Remove all dirt, debris, and organic matter2
Clear drainage: Ensure water flows away from deck and house3
Inspect and repair: Fix any damaged boards, loose fasteners4
Apply sealant: If wood deck needs it (check with water test)5
Store furniture: Move cushions and delicate items indoors6
Cover grills: Or move to garage/shedProtect Your Investment
Remove planters that can trap moisture
Clear leaves from between boards
Check that railings are secure
Trim overhanging branches
Snow Removal Best Practices
Do's
Use plastic shovels: Won't scratch or gouge deck surface
Shovel with grain: Follow the direction of deck boards
Leave thin layer: 1-2" won't harm deck, prevents scratching
Clear regularly: Don't let snow compact into ice
Push, don't scrape: Minimize surface contact
Don'ts
Never use metal shovels: Damages all deck types
Avoid ice chippers: Gouges and scratches surface
No rock salt: Damages wood fibers, stains composite
Don't use snowblower: Unless deck is ground-level with lawn
Recommended Tools
Wide plastic snow pusher
Soft-bristle broom for light snow
Plastic leaf rake for slush
Ice Management
**For Wood Decks:**
Safe Ice Melters
Calcium magnesium acetate (CMA)
Sand or kitty litter (traction, no melting)
Magnesium chloride (use sparingly)
**For Composite Decks:**
Calcium chloride (check manufacturer guidelines)
Sand for traction
Follow manufacturer recommendations
Products to Avoid
Rock salt (sodium chloride): Destroys wood fibers
Potassium chloride: Can stain surfaces
Fertilizer-based melters: Damaging to all deck types
Ice Prevention
Clear snow before it compacts to ice
Ensure proper drainage slope
Address shaded areas that stay icy
Wood Deck Winter Care
Special Considerations
Wood contracts in cold, expanding gaps between boards
Moisture penetration causes freeze-thaw damage
Proper sealing is critical before winter
Signs of Winter Damage
New cracks appearing
Boards popping up
Soft spots (rot beginning)
Significant warping
Composite Deck Winter Care
Advantages
Won't rot from moisture
No sealing required
More resistant to freeze-thaw
Easier snow removal
Watch For
Snow that sits too long (can stain lighter colors)
Ice buildup in textured surfaces
Check manufacturer winter care guidelines
Freeze-Thaw Cycle Protection
Ontario's frequent freeze-thaw cycles cause:
Water seepage into wood grain
Expansion when freezing
Cracking and splitting
Accelerated wear
1
Quality sealant: Prevents water penetration2
Good drainage: Water should never pool3
Proper ventilation: Air flow under deck prevents moisture buildup4
Snow removal: Don't let melting snow refreezeWeight Load Concerns
A typical 300 sq ft deck can handle:
Know Your Limits
40-50 lbs per sq ft live load (12,000-15,000 lbs total)
Most snow loads are well within limits
Wet, heavy snow is concerning over multiple storms
When to Clear
After 12"+ accumulation
When snow is wet and heavy
If deck feels "springy" underfoot
Before ice storms add weight
Furniture and Accessories
**Metal Furniture**: Generally okay if covered
**Wood Furniture**: Bring inside or cover thoroughly
**Cushions/Fabrics**: Always store inside
**Grills**: Cover tightly or store
Covering Tips
Use breathable covers (prevents mold)
Secure against wind
Check periodically for moisture buildup
Post-Winter Assessment
Spring Inspection Checklist
Look for new cracks or splits
Check for rot (probe with screwdriver)
Inspect all fasteners
Examine ledger board connection
Test structural integrity
Small problems become big ones if ignored. Schedule repairs early in spring before deck season begins.
Professional Help
Deck Master Inc. offers:
Address Issues Promptly
Pre-winter inspections
Spring damage assessments
Repair services
Maintenance programs
Protect your investment—contact us before winter hits.
