Deck Board Replacement & Joist Check
The two boards near the grill that flex every time someone steps on them in the same spot. The cedar board at the top of the stairs that split a hairline crack last summer and has been collecting rain water down the grain ever since. The pressure-treated picture-frame board at the corner whose end grain has gone dark and soft because the cut end has been wicking water for ten years. The composite board that warped in the August heat and now sits a quarter-inch proud of its neighbors. Deck board replacement is the trade for the surface-layer fixes that keep a deck presentable and safe to walk on — single boards, short runs, the four boards near the stair landing, the picture-frame perimeter. We probe the joist underneath before any new board goes down, match the lumber as closely as the current stock allows, and fasten with stainless or coated screws sized to the original hole. From $500 for a single board with a joist check up to $2,500 for a multi-board run with end-grain borate treatment and matched hidden fasteners. When the joist underneath has gone soft, the surface board is a temporary cover — we will tell you on arrival and route the work to a proper joist sister-up so the new board is not failing again inside a year.
Service
What Does Deck Board Replacement Include?
Deck board replacement covers the surface boards of a deck — the field boards, the picture-frame perimeter boards, the stair treads, and any board ends that have rotted at the cut. We diagnose on arrival with an awl probe through the board gap and a moisture meter on the joist underneath, remove damaged boards without splitting the neighbors, match the lumber as closely as available stock allows, treat the cut ends with a borate wood preservative against future rot, fasten with stainless or coated screws sized to the original hole (or with matched hidden-fastener plugs for hidden-fastener systems), and screwdown every popped fastener in the adjacent run. The scope assumes the joists underneath are sound — when a joist has gone soft, we route the work to the joist and substructure repair scope before any surface board goes back down.
Joist Probe Before Any Board Comes Off
Every visit starts with an awl probe through the board gap into every visible joist in the affected bay, plus a moisture meter reading on the joist surface where reachable. A healthy joist is dry, light-colored, and the awl bounces off; a failing joist is dark, soft, and the awl pushes in. The probe takes 10 minutes and decides the scope of the visit — board replacement only, or board replacement plus joist sister-up. We do not put a fresh board over a wet or soft joist; the new board is a temporary cover that fails again inside a year and costs you twice.
Damaged Board Removal Without Splitting the Neighbors
The damaged board comes out with a controlled pry — the screws or hidden fasteners get backed out (or cut where corroded beyond extraction), the board lifts off, and we inspect the joist below before we close anything back up. Splitting a neighbor board on extraction means the cost of replacement just doubled — we work slowly enough to avoid that. Hidden-fastener systems (Cortex plugs, Camo blind screws, FastenMaster slotted clips) get the right tool from truck stock; no improvised extractions.
Lumber Matching to Existing Run
The replacement board matches the existing run as closely as available stock allows — species (western red cedar, pressure-treated southern yellow pine, eastern white cedar, redwood), dimension (5/4 x 6 deck board nominal, 2x6 framing-grade deck board, 1x6 cedar deck board), grain orientation (vertical-grain versus flat-sawn), and profile (radius edge versus square edge, picture-frame mitre versus butt joint). New cedar reads lighter than weathered cedar for 12 to 18 months — UV exposure blends it over time. Pressure-treated reads green-tinted at install, fading to gray over 6 to 12 months. We tell you upfront when an exact match is unavailable and what the closest substitute looks like.
End-Grain Borate Treatment Against Future Rot
Cedar and pressure-treated boards rot at the cut ends first — the end-grain wicks rain water that never reaches the surface of the rest of the board. We treat every cut end with a borate wood preservative (Boracare, Tim-bor, or Penetreat) on the visible end-grain plus the first inch of the side-grain near the cut. The treatment penetrates 3/8 to 1/2 inch into the end-grain, blocks fungal growth, and adds five to ten years of life to the cut end before it has to be re-treated.
Stainless or Coated Deck Screws Sized to the Original Hole
Standard zinc-coated interior screws rust through outdoor exposure in one wet season. We install stainless steel or HDG ceramic-coated deck screws sized to the original hole (#8 x 2-1/2 inch for cedar field boards, #10 x 3 inch for pressure-treated, #10 x 3-1/8 inch for composite over deeper sleeper systems). When the original hole is stripped, we relocate the screw a half-inch and plug the old hole with an epoxy filler. Hidden-fastener systems get the matched plug from truck stock — Cortex collated plugs, Camo blind-screw collated, FastenMaster slotted clips — sized to the deck-board brand.
Adjacent Run Screwdown
Before we leave, we walk the boards within a 4-foot radius of the replacement and screwdown every popped fastener — the most common cause of a board working loose on a PNW deck is freeze-thaw cycling backing screws out a half-turn each winter. The walk takes 5 minutes per affected bay and prevents the next service call.
How Deck Board Replacement Works
Seven sequential steps from the awl probe on arrival through end-grain treatment, lumber matching, and the adjacent-run screwdown — the sequence we follow on every deck board replacement visit.
Awl Probe and Moisture Meter on Every Joist in the Affected Bay
Awl probe through the board gap into every visible joist plus a moisture meter on the joist surface where reachable. Healthy joists are dry and the awl bounces off; failing joists are dark and the awl pushes in. The probe decides the visit scope — board replacement only or board replacement plus joist sister-up.
Honest Scope Call Before Any Board Comes Off
If the joist is sound, the visit is straightforward board replacement. If the joist has gone soft, the new board over a wet joist is a temporary cover — we route the work to the joist and substructure repair scope and quote the joist work before any surface board gets touched. We do not put a fresh board over a failing joist.
Damaged Board Removal Without Splitting Neighbors
Controlled pry on the damaged board — screws backed out (or cut where corroded), hidden fasteners extracted with the right tool from truck stock (Cortex, Camo, FastenMaster). The board lifts off without splitting the adjacent boards. Splitting a neighbor doubles the cost of the visit, so we work slowly enough to avoid it.
Lumber Matching to the Existing Run
The replacement matches species, dimension, grain orientation, and profile as closely as current stock allows. Vertical-grain cedar, flat-sawn pressure-treated, brand-specific composite (Trex Transcend, TimberTech AZEK, Fiberon Sanctuary, etc.) sourced before the visit. New cedar reads lighter for 12 to 18 months; pressure-treated reads green at install and fades over 6 to 12 months.
End-Grain Borate Treatment Against Future Rot
Every cut end gets a brush coat of borate wood preservative (Boracare, Tim-bor, or Penetreat) on the end-grain plus the first inch of side-grain. The treatment penetrates 3/8 to 1/2 inch, blocks fungal growth, and adds five to ten years of life to the cut end before re-treatment.
Fasten with Stainless or Hidden-Fastener System
Stainless or HDG ceramic-coated deck screws sized to the original hole. Stripped holes get the screw relocated a half-inch and the old hole epoxy-plugged. Hidden-fastener systems get the matched plug from truck stock — Cortex, Camo blind-screw, FastenMaster slotted clips — sized to the deck-board brand.
Adjacent-Run Screwdown Within a 4-Foot Radius
Every popped fastener in the boards within 4 feet of the replacement gets walked and screwdriven back into the joist. The most common cause of a board working loose on a PNW deck is freeze-thaw cycling backing screws out a half-turn each winter; the screwdown prevents the next service call.
Deck Board Replacement Pricing
Final pricing depends on the number of boards, the board material, hidden-fastener system if any, end-grain treatment scope, and whether the joist underneath needs sister-up before any surface board can go back down. Joist sister-up routes to the joist and substructure repair scope and is quoted separately. Request a free estimate for an accurate quote.
Send us a photo of the failing board and the joist gap underneath — we will quote the replacement with the joist check included.
Why Handis for Deck Board Replacement
The deck board problem that homeowners most often misdiagnose is a soft board that is actually a failing joist. They feel the bounce, replace the surface board, and call it done. Inside a year the new board is soft again — because the joist underneath was wet the whole time, and the new board has been wicking moisture from below the same way the old one did. The honest call on every soft board is to probe the joist before the new board goes down. Healthy joist, single-board fix, $500. Soft joist, sister-up first, then the board — costs more, but the new board actually lasts. Skipping the probe to save the diagnostic minutes is the most expensive thing a Seattle homeowner can do to a deck.
Awl probe on every joist before any board comes off
Every visit starts with an awl probe through the board gap into every visible joist in the affected bay, plus a moisture meter on the joist surface where reachable. The probe takes 10 minutes and decides whether the visit is a $500 single-board fix or a multi-thousand-dollar joist-and-board project. We do not put a fresh board over a wet joist; the new board is a temporary cover that fails again inside a year. Honest diagnosis up front, not optimistic shortcuts that cost you twice.
Lumber matched to species, dimension, grain, and profile
Replacing three boards with off-color or different-dimensional lumber looks worse than the original damage. We source the closest match in species (western red cedar, pressure-treated southern yellow pine, eastern white cedar, redwood), dimension (5/4 x 6, 2x6, 1x6), grain orientation (vertical-grain versus flat-sawn), and profile (radius edge, square edge, picture-frame mitre). For composite, we source the brand and line by name — Trex Transcend, TimberTech AZEK, Fiberon Sanctuary — because the colors and textures do not cross-brand. We tell you upfront when an exact match is unavailable.
Borate end-grain treatment at every cut end
Cedar and pressure-treated boards rot at the cut ends first — the end-grain wicks rain water that never reaches the surface of the rest of the board. We brush borate wood preservative (Boracare, Tim-bor, or Penetreat) onto every cut end plus the first inch of side-grain near the cut. The treatment penetrates 3/8 to 1/2 inch into the end-grain, blocks fungal growth, and adds five to ten years of life to the cut end before re-treatment. Generic deck-replacement crews skip this step; we put it on every visit.
Stainless or HDG ceramic-coated fasteners sized to the original hole
Standard zinc-coated interior screws rust through outdoor exposure in one wet season. ACQ-treated pressure-treated lumber (post-2004 standard) is significantly more corrosive to fasteners than the old chromated copper arsenate stuff — meaning generic galvanized screws fail fast. We install stainless or HDG ceramic-coated deck screws sized to the original hole; stripped holes get the screw relocated a half-inch and the old hole epoxy-plugged. Hidden-fastener systems get the matched plug from truck stock.
Adjacent-run screwdown — prevents the next service call
Before we leave, we walk the boards within a 4-foot radius of the replacement and screwdown every popped fastener. Freeze-thaw cycling in the PNW backs screws out a half-turn each winter; on a deck that has not been touched in five years, half the boards in the affected bay usually have at least one popped fastener. The walk takes 5 minutes per bay and prevents the next service call.
30-day workmanship guarantee, one-year on the new board
Handis carries general liability and workers' compensation; every technician has cleared a background screening before the first job. The fastener install carries a 30-day workmanship guarantee — if a screw we set backs out, a hidden plug loosens, or a board we installed shifts because of our installation, we come back and correct it at no extra charge. The new board itself carries a one-year project warranty against failure of the borate treatment or splitting at the fastener locations from our work. Weather damage, normal wood movement (cupping, checking, slight grain raise on new lumber), and UV-driven color change on new boards are not workmanship issues and fall outside the guarantee.
Estimate
Tell us how many boards need replacement, the board material (cedar, pressure-treated, composite — brand if you know it), where on the deck (field, stair tread, picture-frame perimeter, stringer end), how long they have been failing, and any signs of joist trouble underneath (visible rot through the gap, moisture stain, soft bounce). Send phone photos if you can — the top of the board and the gap-side view of the joist beneath both help us pre-stage the right lumber and treatment.
Customer Reviews
Recent deck board replacement reviews from verified Handis customers.
Single board near the grill on our 2008 cedar deck that had split last summer. Handis tech probed the joist underneath first, confirmed it was solid, pulled the failing board, matched the cedar grain as close as the lumberyard had in stock, brushed borate on the cut ends, fastened with stainless. Also screwed down five popped fasteners in the boards nearby. Maybe 90 minutes total. Clean visit.
Four soft boards near the stairs on our 2012 pressure-treated deck. Tech awl-probed every joist in the bay first, said three of the four joists were still solid but the fourth was wet at the rim. He was honest that the surface boards over the bad joist would fail again inside a year and quoted a follow-up joist sister-up. We did the boards he could safely do that day and scheduled the joist work two weeks later. Saved us a future tear-out.
Composite Trex deck off our Sammamish house, one board had warped in the August heat and sat a quarter-inch proud. Handis matched the exact Trex Transcend color from a sample piece I had in the garage, brought the right Cortex plug for the brand, swapped the board, screwed down two popped collar plugs in the surrounding boards. The repair is invisible. Six months later the board is still flush.
Picture-frame perimeter on our south-facing deck — the cut-end mitres on every corner had gone soft from years of rain wicking down the end-grain. Handis cut out the failing perimeter on the south side, mitred new cedar to match, brushed borate on every cut end including the back of every mitre joint, and fastened with stainless. Two visits because of weather delays on visit two; clean work on both.
Three stair tread replacements on the back steps of our Bellevue split-level. Old treads were checked through and one had a soft end. Tech matched the pressure-treated stock, treated the cut ends with borate, fastened with stainless deck screws, and probed the stringers underneath while he was at it. Found one stringer end starting to soften and flagged it for next year. Treads have not budged.
Frequently Asked Questions
Common questions about Handis deck board replacement — pricing, lumber matching, end-grain treatment, joist scope, and what fits a single visit.