How long does a deck last in Minnesota?

A pressure-treated deck typically lasts 10 to 15 years before major work, cedar 15 to 20 with maintenance, and composite surfaces 25 or more. The frame and footings often outlive the decking if they were built right.

How do I check my deck ledger?

Look at where the deck meets the house. You want to see bolts or structural screws in a staggered pattern, not nails, plus flashing over the top edge. Rust streaks, gaps, or soft wood at the siding are all reasons to stop and get it inspected.

What is code for deck railing height?

Guards are generally required on any walking surface more than 30 inches above grade, at 36 inches tall for residential decks, with baluster spacing that won't pass a 4 inch sphere.

Is it cheaper to repair or replace a deck?

Repair, if the frame and footings are sound — usually a third to half of replacement cost. Once the ledger, joists or footings are compromised, replacement is the cheaper answer over any real time horizon.

Is My Deck Safe? Free Deck Safety Inspection Checklist

The ledger board is the failure point

When a deck collapses, it almost never snaps in the middle. It peels off the house. The ledger board is the piece bolted to the home's rim joist, and if it was nailed instead of through-bolted or lagged with structural fasteners, it's holding on with friction and optimism.

The second half of that failure is water. Without flashing, water runs behind the ledger and rots the home's rim joist — the part you can't see from the deck. That rot is why a deck built to spec in 2005 can be unsafe now.

Footings and Minnesota frost

Deck footings in the metro need to bear below frost depth, typically 42 inches or more. Precast surface blocks sitting on grade are legal for some freestanding, ground-level decks and a disaster for anything attached or elevated — the frost lifts them every winter and they don't come back down evenly.

If your posts have visibly moved, or the deck has developed a slope it didn't used to have, the footings are the reason and no amount of new decking fixes it.

Repair or rebuild

The honest rule of thumb: if the frame and footings are sound, repairing boards, railings and hardware is worth it and typically runs a third to half the cost of a new deck. If the ledger, footings or joists are compromised, you're rebuilding — patching a bad frame just moves the failure a year down the road.

A deck that's structurally sound but ugly is also a great candidate for a resurface: keep the frame, replace the decking and railing with composite, and get a 25-year surface for well under rebuild pricing.

Common questions

How long does a deck last in Minnesota?: A pressure-treated deck typically lasts 10 to 15 years before major work, cedar 15 to 20 with maintenance, and composite surfaces 25 or more. The frame and footings often outlive the decking if they were built right.
How do I check my deck ledger?: Look at where the deck meets the house. You want to see bolts or structural screws in a staggered pattern, not nails, plus flashing over the top edge. Rust streaks, gaps, or soft wood at the siding are all reasons to stop and get it inspected.
What is code for deck railing height?: Guards are generally required on any walking surface more than 30 inches above grade, at 36 inches tall for residential decks, with baluster spacing that won't pass a 4 inch sphere.
Is it cheaper to repair or replace a deck?: Repair, if the frame and footings are sound — usually a third to half of replacement cost. Once the ledger, joists or footings are compromised, replacement is the cheaper answer over any real time horizon.