Ontario decks go through dozens of freeze and thaw cycles every winter, and wood, fasteners and footings all move slightly with each one. None of that is a problem on a deck that was closed down properly in the fall. It becomes a problem on one that was not, and the whole checklist takes less than an hour.
Clean it before the snow, not after
A clean, dry deck going into winter is the starting point for everything else on this list.
- Sweep leaves and debris out from between the deck boards with a stiff broom or a putty knife for tight gaps.
- Clear the ledger board, where the deck meets the house, since debris trapped there holds moisture against both the deck and the siding.
- Rinse the whole surface with a hose to carry loose grit and organic matter off the edge rather than leaving it to blow back between the boards.
- Let the deck dry fully before moving on to the fastener check below, since loose boards are far easier to spot dry than wet.
Check the ledger and the fasteners
The ledger board is the single most important structural connection on the whole deck, and it is worth a genuinely close look, not a glance from the yard.
- Look for any gap opening up between the ledger and the siding above it.
- Check flashing along the top of the ledger for anything that has come loose or pulled away.
- Look for rust streaks running down from fastener heads, which suggest water has been getting behind the ledger over time.
- Walk the deck surface and reset any loose boards or popped nails you feel flex underfoot.
- Check railing posts for movement by pushing firmly at the top, since a post that racks side to side needs attention before it takes a heavy snow load.
Furniture, planters and rugs
Anything sitting on the deck surface all winter, planters, outdoor rugs, furniture with feet that do not breathe, traps moisture against the boards underneath it in exactly the same way as trapped leaves do, and it happens invisibly under a rug or a heavy planter where nobody checks until spring. Clear the deck down to bare boards for winter if that is practical, or at minimum lift anything left out periodically after a thaw to let the wood underneath actually dry before the next freeze locks the moisture back in.
Staining and sealing is a spring job, not a fall one
It is tempting to want to seal a deck before winter so it goes in protected, but stain and sealant both need the wood to be genuinely dry all the way through to bond properly, and a deck in late autumn Ontario is rarely dry for long enough between rain and falling temperatures. Staining is better done in late spring or early autumn once the wood has had a real stretch of dry, mild weather, not immediately before the first snowfall when the product has no real chance to cure before it gets buried.
If the ledger, posts or boards need more than a tighten-up, our deck repair and carpentry service in Kitchener, Waterloo and Cambridge can rebuild the weak sections before winter loads them further.