Rotted Deck Joists Sistered or Replaced With Exterior-Rated Pressure-Treated Lumber.

Epp Foundation Repair probes each exterior deck joist for rot, sisters or replaces the failed members with pressure-treated lumber, fastens with GRK RSS 5-inch Climatek-coated or stainless structural screws rated for exterior use, and upgrades any corroded Simpson joist hangers with new stainless or hot-dipped galvanized hardware. The work is exterior structural carpentry, distinct from interior floor-joist repair because the lumber is exposed to chronic moisture, freeze-thaw cycling, UV degradation, and direct ground contact at the support posts. Customized Repair Estimate after on-site inspection reflects your scope.

Dave Epp has assessed enough Nebraska and Iowa decks across more than two decades to know exactly where the rot will be before he probes. The ledger-to-house connection is the first failure point, particularly on decks built in the 1990s and early 2000s when flashing details were not yet code-driven. Water gets behind the ledger, sits against the band joist of the house, and rots both the ledger and the first 6 to 8 inches of every joist hanging from it. The joist-hanger contact is the second failure point. Galvanized hangers from 30 years ago corrode where they hold moisture against the wood, and the corrosion accelerates rot at the contact face. The ground-contact joist end at the support posts is the third failure point, particularly on decks where the joist extends below the post cap and the end-grain sits in standing water during snowmelt. 50-plus freeze-thaw cycles a year accelerate every one of those failure modes. Water that sits in a hanger pocket in October freezes in January, expands the corroded steel, and pries the wood fiber apart. Repeat for 30 years.

Epp Foundation Repair handles the joist work and the hardware. That includes probing for rot, sistering rotted joists with new pressure-treated lumber, replacing entirely failed joists, swapping corroded hangers for new stainless or hot-dipped galvanized Simpson hangers, and re-fastening with exterior-rated structural screws. Epp does not replace deck surface boards (decking, railings, stair treads). That is a deck-builder scope, separately priced. Epp does not redo the ledger-board attachment to the house. The ledger is the primary structural connection between the deck and the house, and if the ledger is failed, the entire deck-to-house connection has to be re-engineered with proper flashing, structural ledger screws or through-bolts, and lateral-load connectors per current code. That is a deck-builder scope or a structural engineer scope, not an Epp scope. Epp does not repair stair stringers. That work belongs to a finish or deck carpenter.

If the ledger board is failed, joist repair alone is unsafe. The ledger is the primary load path from the deck to the house, and replacing rotted joists on a failing ledger leaves the homeowner with a deck that is one bad day from pulling away from the house. Epp Foundation Repair's recommendation in that case is straightforward: get a licensed deck builder to assess the full deck for replacement or full ledger reconstruction before any joist work is done. The honest answer is sometimes "this is not the right repair."

1. Inspection and probe. Dave Epp or a senior estimator probes every joist with an awl, checks the ledger condition with a moisture meter and visual inspection of the flashing, evaluates every joist hanger for corrosion, and assesses the ground-contact end at each support post. 2. Honest go-or-no-go. If the ledger is failed, the recommendation is a deck-builder full-deck assessment, not Epp joist work. If the ledger is sound and only joists and hangers need repair, the scope and price go in writing. 3. Sistering and replacement. Rotted joists are sistered with new pressure-treated lumber alongside the existing member, fastened with GRK RSS 5-inch Climatek-coated structural screws. Joists too far gone to sister are removed and replaced. 4. Hardware upgrade. Corroded joist hangers are removed. New stainless or hot-dipped galvanized Simpson hangers are installed with exterior-rated structural fasteners. 5. Verification and cleanup. Each repaired joist is verified for plane and connection integrity. Work area is cleaned and any debris hauled off.

Epp Foundation Repair is BBB A+ rated, won the BBB Integrity Award in 2011 and 2016, and has repaired exterior framing across the Midwest continuously since 1994. The on-site inspection comes with an honest recommendation. Including the recommendation to call a deck builder instead when the ledger is the actual problem.