Most decks don’t die of old age. They die of shortcuts.
Walk any street in the GTA and you’ll find decks that looked flawless on handover day and were sagging, greying and pulling away from the house before their tenth summer. The boards on top rarely fail first. What fails is everything underneath and around them — the parts nobody photographs, the parts the low bid quietly leaves out.
The good news: a deck that lasts twenty years and a deck that lasts ten aren’t built from different wood. They’re built to a different standard in five specific places. Get these right and your deck will still be dead solid long after your neighbour has replaced theirs twice.
1. Build from the ground down, not the boards up
A deck is only as good as what it stands on. In Toronto that means footings dug below the frost line — deep enough that the freeze-thaw cycle can’t heave a post out of the ground a little further every winter until the whole frame goes out of level.
Shallow footings backfilled with dirt are the single most common reason a deck starts to lean, bounce or pull away from the house. Proper footings sit on concrete piers below frost depth, and the frame that lands on them is squared, over-built and fastened for the load it actually carries — not the minimum that passes a glance.
This is the part you’ll never see once the deck is finished. It’s also the part that decides whether everything above it lasts. Spend here first.
2. Flash the ledger like your house depends on it — because it does
If your deck attaches to the house, the ledger board is where it bolts on. It’s also the single most dangerous joint on the entire structure, and the one most often done wrong.
Water gets in behind an unflashed ledger, sits against the house framing, and rots it from the outside in — usually invisibly, for years, until something gives. A properly flashed ledger sheds that water away from the house every time. It’s a small strip of metal and an hour of care, and skipping it is how a deck failure becomes a house-framing failure.
Ask any builder you’re considering how they flash the ledger. If the answer is vague, keep looking.
3. Match the material to the maintenance you’ll actually do
The longest-lasting material is the one you’ll actually look after — so be honest with yourself about that before you choose.
Pressure-treated wood is the most affordable and, sealed on schedule, lasts well. But “on schedule” means cleaning and re-sealing every one to two years, forever. Cedar is more naturally weather-resistant and ages beautifully, but still wants attention. Composite decking costs more up front and asks for almost nothing after — no sanding, no staining, no sealing — with fade and stain warranted in writing for decades.
There’s no wrong answer here. There’s only the wrong answer for you. A homeowner who won’t re-seal a wood deck will get twenty years out of composite and ten out of cedar. Choose for the life you actually live, not the one you’re planning to.
4. Use fasteners and hardware that outlast the wood
Nails back out. Cheap screws rust, streak the boards below them, and lose their grip. Hardware that isn’t rated for exterior use bleeds corrosion into everything it touches and fails right when the deck needs it most.
A twenty-year deck is put together with hot-dipped galvanized or stainless fasteners and connectors throughout, hidden fastening systems on the surface where it matters, and joist tape capping the framing so water can’t sit in the screw holes and rot the deck from the inside. It’s an unglamorous line on the quote. It’s also the difference between a deck that’s still tight in year fifteen and one that squeaks, lifts and pops.
5. Give it a maintenance rhythm — or buy your way out of one
Every deck lasts longer when someone pays a little attention to it. For a wood deck, that’s a genuine rhythm: sweep off the debris that traps moisture, keep the gaps between boards clear so water drains, clean it once a year, and re-seal on schedule before the finish gives out rather than after.
None of it is hard. All of it gets skipped. Which is exactly why so many homeowners eventually choose composite — not because they’re lazy, but because they’d rather spend their weekends on the deck than working on it. Either path gets you to twenty years. What doesn’t get you there is a wood deck that never gets touched.
The through-line
Notice what four of these five have in common: they’re invisible. Footings, flashing, fasteners, the base rhythm of care — none of it shows in the finished photo, and all of it decides how long the finished photo stays true.
That’s the whole game. The parts you can see are easy. The parts you can’t are where decks are won or lost, and they’re precisely where the cheapest quote cuts. A deck built right in those five places doesn’t just last longer — it stays flat, stays tight and stays safe the entire time.
If you’re planning a build and want it done to that standard, we’d be glad to take a look. The consultation and the quote are free, and we’ll tell you straight what your deck needs to still be standing solid two decades from now.