Repair or replace? How to tell if your deck is worth saving

Every spring we get the same call: the deck looks tired, boards feel spongy underfoot, and homeowners want to know whether to rebuild or refinish. The good news is you can usually answer that yourself in about ten minutes with a screwdriver and a flashlight.

Check the structure first, not the surface

The boards you walk on aren't what holds the deck up — the joists, beams, and posts underneath are. If those are sound, almost any deck is worth saving.

Get underneath with a flashlight. Poke a screwdriver into the joists and posts where they meet the ground or concrete. If the tip sinks in more than a quarter inch, that's rot. A little surface softening is normal; deep, punky wood is not.

Then check the fasteners

Rusted joist hangers, missing nails, or lag bolts backed out from the ledger board are all fixable — but they're safety issues, not cosmetic ones. If the ledger (the board bolted to your house) is soft or pulling away, stop using the deck until it's addressed.

The decision, in plain terms

Structure sound + 80% of boards intact: refinish. Strip, sand, replace the bad boards, and re-stain. You'll spend a fraction of a rebuild and get 5–8 more years.

Structure sound + more than 20% of boards rotted or cupped: partial rebuild. Keep the frame, replace the decking and railings.

Structure compromised: full rebuild. It's not worth putting new boards on a failing frame — you'll be tearing it out in two years anyway.

One more thing

In Northern Utah, UV and heat do more damage than water. A refinished deck with a good penetrating stain (not a film-forming one) will hold up dramatically better than a rebuild you never re-treat. Maintenance beats materials.