Before you even get to material or railing choices, every deck starts with one structural decision: does it attach to the house, or stand entirely on its own? Here's what that choice actually involves.
A ledger-mounted deck bolts a ledger board directly to the house's rim joist, and the deck framing ties into that ledger on one side. Properly flashing that connection is critical — it's the single highest-risk spot on a deck for hidden water intrusion into your house structure, not just the deck itself.
A freestanding deck has its own beam and posts on every side, including the side nearest the house — there's no structural connection to the house at all. It sits a couple inches away from the siding rather than bolting to it.
| Category | Ledger-Mounted | Freestanding |
|---|---|---|
| Connection to house | Bolted ledger board, requires proper flashing | None — sits independently |
| Framing needed | One less beam/post line since the house shares the load | Full beam and posts on every side |
| Water intrusion risk | Higher if the ledger isn't flashed correctly | None at the house connection, since there isn't one |
| Placement flexibility | Fixed to the house wall | Can be positioned anywhere in the yard, attached-feeling or not |
| Best for | Decks directly off a back door or patio door | Decks around pools, detached structures, or where you don't want to touch the house at all |
A ledger-mounted deck can save some framing since one side of the deck shares the house's structure instead of needing its own beam and posts. But that shortcut comes with responsibility: if the ledger isn't flashed correctly, water gets behind it and into your house's rim joist and framing — a much bigger problem than anything happening on the deck itself. This is the single most common source of hidden structural damage we find on ledger-mounted decks.
Almost every serious rot problem we've found on a ledger-mounted deck traces back to flashing that was skipped or done wrong at installation, not to anything that happened years later. It's not a maintenance item — it's a one-time detail that has to be right from day one, because you don't get an easy second look at it once the deck boards are down.
The tradeoff is more framing material and footings, since the house isn't sharing any of the structural load.
Ruth Fence and Deck builds both ledger-mounted and freestanding decks throughout Louisville KY and Southern Indiana, with flashing done right. Free estimates, 0% financing.
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