A wood deck or fence that looks fine in September can reveal serious problems by May. The freeze-thaw cycle that defines a New Brunswick winter is relentless on outdoor wood structures — water gets into small cracks, freezes, expands, and opens those cracks wider. Do this enough times over a winter and what was a minor repair becomes a structural replacement.
The fall window — ideally before the first hard frost — is the right time to assess your deck and fence, address minor issues, and protect the wood for winter. Here's exactly what to look for.
Deck Assessment: What to Check
- Decking boards — look for cracking, splitting, cupping, or soft spots. Press firmly on boards near the ledger and posts; any give indicates rot.
- Ledger board — this is the board that attaches the deck to your house. It's the most critical structural element and the most common failure point. Check for rot, separation from the house, and whether flashing is intact.
- Posts and footings — check posts for rot at the base, especially where they meet the ground or concrete. Footings should be solid with no visible cracking or heaving.
- Joists — if you can access the underside of the deck, inspect joists for rot, insect damage, and proper fastening.
- Railings — grab each railing section and apply lateral force. There should be no movement. Loose railings are a safety issue.
- Fasteners — look for raised screws, rusted hardware, or missing fasteners. These should be addressed before winter.
Fence Assessment: What to Check
- Posts — push each post firmly. Any movement at the base indicates rot or a failed footing. Posts set in concrete can still rot above the concrete line.
- Rails — check horizontal rails for sagging, cracking, or separation from posts.
- Pickets or panels — look for rot, warping, or missing fasteners. Loose pickets can become projectiles in a winter storm.
- Gates — test the swing and latch. Gates that drag or don't latch properly will worsen over winter as the ground shifts.
Fall Maintenance Steps
Once you've completed your assessment, there are a few maintenance steps worth doing before winter arrives:
- Clean the deck surface — remove debris, leaves, and dirt that hold moisture against the wood
- Apply a water-repellent sealer if the wood is dry and the surface is clean — this is best done in fall before temperatures drop below 10°C
- Tighten or replace loose fasteners
- Address any soft or rotted wood now — small repairs are far less expensive than structural replacements in the spring
- Clear drainage paths — ensure water can drain away from the deck and fence base
The most expensive deck repair is the one you didn't catch in the fall. A 30-minute walkthrough now can save a full replacement in the spring.
When to Call a Professional
If you find rot in the ledger board, movement in deck posts, or multiple fence posts that are failing, these are structural issues that go beyond DIY maintenance. A professional assessment will tell you whether you're looking at targeted repairs or a full replacement — and give you an accurate picture of what it will cost.
CORE Outdoor Works handles deck and fence assessments, repairs, and replacements across Greater Moncton. If you'd like a professional set of eyes on your outdoor structures before winter, reach out and we'll schedule a walkthrough.
