When to repair a deck and when to replace it entirely

The question we get asked most often about decks is whether to fix what is there or tear it down and start over. The honest answer is that it depends on the framing. Decking boards and railings are replaceable. Footings and framing are the structural core, and if those are compromised, putting new boards on top of them is just delaying the real problem.

Start with the framing, not the surface ¶

Before you decide anything, get someone to look at the framing. Pull up a board or two if you have to. Press a screwdriver into the joists, the beam, and the posts. Sound wood resists. Soft wood means rot has started. If the framing is solid, a deck that looks rough on the surface is often a good candidate for repair.

The ledger, the board that connects the deck to the house, deserves particular attention. A failing ledger connection is a safety issue, not just an aesthetic one. If the ledger is pulling away from the house or the flashing is missing or failed, that needs to be addressed regardless of what you decide about the rest of the deck.

The footings question ¶

If the footings are undersized or too shallow, the deck will keep moving no matter what you do to the surface. In Vermont, footings that do not reach below the frost line will heave every spring. If you have a deck that has been shifting or pulling away from the house over several years, shallow footings are a likely cause.

Extending or replacing footings is possible without tearing down the whole deck, but it requires temporarily supporting the structure above. It is not a small job, but it is often less expensive than a full replacement if the framing above the footings is in good shape.

When replacement makes more sense ¶

If the framing is rotted in multiple places, if the posts are soft at the base, if the ledger connection has been compromised for long enough that the band joist behind it is also damaged, replacement is usually the more economical choice over a ten-year horizon. Patching a deck with failing structure is work that will need to be done again in a few years.

If you are not sure which way to go, a site visit costs nothing and usually answers the question pretty quickly. We have looked at a lot of decks that people thought needed to come down and a few that people thought just needed new boards.