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Deck Repair, Staining & Building in St. Louis

Rotted boards, loose railings, faded stain, or time for a new deck FIX St. Louis handles it all with no minimum job size.


Deck Repair & Services in St. Louis


FIX St. Louis repairs, maintains, stains, and builds decks in St. Louis. Services include replacing individual rotted boards, re-securing detaching boards, replacing railing systems in lumber or PVC, replacing deck posts, repairing stair components, powerwashing, staining, and building new decks from pressure-treated lumber, cedar, or composite. For structural repair involving footings, ledger boards, or failing joists, we assess honestly and refer to bonded deck builders when needed. Firm quote before any work. No minimum job size. Phones answered 24/7.

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Deck Services FIX St. Louis Handles

For porch repair and fence repair, visit our standalone Porches and Fences pages.

ServiceWhat We Do
Powerwash deckPressure wash deck surface; remove algae, mold, and embedded grime; prepare for staining.
Stain deckApply penetrating or film-forming stain after proper surface preparation; protect and restore color.
Replace rotted deck boardsRemove and replace individual rotted boards; secure with appropriate fasteners.
Repair detaching deck boardsRe-secure deck boards that have lifted, cupped, or separated from joists.
Build a new deckDesign and build a new pressure-treated, cedar, or composite deck; permit guidance provided.
Replace deck boards (PT lumber)Replace full deck surface with pressure-treated lumber; refinish framing as needed.
Replace deck boards (cedar)Replace deck surface with cedar boards; apply initial stain/sealer.
Replace deck boards (composite)Replace deck surface with composite decking material; hidden or face fasteners as specified.
Replace deck railings with lumberRemove deteriorated or unsafe railings; install new lumber rail system.
Replace deck railings with PVCInstall PVC/vinyl rail system; low maintenance; match post spacing to existing footings.
Replace deck postsReplace rotted or damaged structural posts; set correctly at existing footings.
Replace top rails, pickets, fasciaReplace individual railing components without full system removal.
Replace stair railings, treads, risers, stringersRepair or replace individual stair components; full stair rebuild where needed.
Repair deck handrails and post capsRe-secure loose handrails; install or replace post cap hardware.

Deck Materials: What to Know Before Replacing Boards or Railings

When deck boards, railings, or stairs need replacing, the material choice determines how the repair looks, how long it lasts, and how much maintenance it requires afterward.

MaterialCostLifespanKey Notes
Pressure-treated lumberLeast expensive10–15 years with maintenanceNeeds staining every 2–3 years; can warp or check; widely available
CedarMid-range15–20 years with maintenanceNaturally rot-resistant; beautiful grain; accepts stain well; lighter weight
Composite (Trex-style)Highest25–30 yearsLow maintenance; no staining; fades slowly; scratches visible; non-structural
PVC / vinyl (railings)Mid-range20+ yearsZero maintenance; never needs painting; used for railings, not structural decking
One Practical Note:

when replacing individual boards, matching the existing material is usually the right approach. Mixing a composite deck board into a pressure-treated deck, or vice versa, creates visual and dimensional inconsistency. If the deck is approaching end of life and multiple boards need replacing, a full re-decking in one material is often more economical than patching.

314-434-4100

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The Most Common Deck Problems in St. Louis

Rotted and Detaching Deck Boards

Deck board rot in St. Louis is almost always a moisture problem. Water sits on the surface and is absorbed at end grain, at fastener holes, and at any surface crack. Once rot starts, it accelerates softened wood absorbs more water, which creates more rot. The pattern in St. Louis is that rot appears first on the boards nearest the house (where roof overhang, gutters, and wall moisture concentrate) and at the ends of boards.

The repair is straightforward when caught early: remove the affected board, inspect the joist beneath it for signs of rot, replace the board with matching material, and seal the end grain. Boards that have detached from joists but are otherwise sound are re-secured with appropriate deck screws or hidden fasteners.

Dr. Steve’s Take:

Dr. Steve covered summer as the season when deck problems become most visible and also the season when St. Louis homeowners actually use their decks and discover what winter left behind. A board that looks borderline in May becomes a hazard by July as summer use puts weight on compromised wood. Inspect your deck boards at the start of each warm season probe soft-looking spots with a screwdriver.

From Dr. Steve’s Tips: Here Comes the Sun and I Say, It’s Alright (Most of the Time)

Powerwashing and Staining

A deck that has not been cleaned in two or more years has accumulated mold, algae, and embedded grime that stain alone will not penetrate properly. Powerwashing removes the surface contamination and opens the wood grain, which is essential for stain adhesion. Staining over a dirty deck is one of the most common and most visible DIY mistakes the stain peels within a season because it never bonded to the wood.

After powerwashing, the deck must dry completely before stain is applied typically 48 to 72 hours in St. Louis summer humidity. Staining wet wood traps moisture under the film and causes bubbling and premature failure. We schedule the two steps with the right interval between them.

Dr. Steve’s Pro Tip:

Pressure-treated lumber should not be stained in the first year after installation. New PT lumber contains high moisture content from the treatment process, and stain applied to wet treated wood does not penetrate or adhere properly. Wait until the wood has dried and started to gray slightly the stain will penetrate and last significantly longer.

Loose and Deteriorated Deck Railings

A loose deck railing is a safety issue, not a cosmetic one. Deck railings are required by code to withstand 200 lbs of lateral force at any point. A railing that wobbles under hand pressure has already failed that threshold. We assess whether the failure is in the railing hardware, the post connection to the deck frame, or the post itself, and repair the actual failure point rather than just tightening what’s accessible.

Railings that are structurally sound but aesthetically worn weathered wood, faded paint, split pickets can be replaced without touching the structural posts. PVC railing systems are an increasingly popular replacement choice for St. Louis homeowners who want a finished appearance without annual painting or staining.

Dr. Steve’s Take:

Deck railings made Dr. Steve’s list of the most important pre-sale exterior repairs. A wobbly railing is flagged by every home inspector and tested by every buyer. More importantly, it is a fall hazard for anyone who uses the deck. A railing replacement, done correctly, pays for itself twice once in safety and once in what it doesn’t cost at the negotiating table.

From Dr. Steve’s Tips: Simple Repairs to Enhance Your Home’s Resale Value (No Renovations!)

Deck Stairs: Railings, Treads, Risers, and Stringers

Deck stairs take more wear than the deck surface because they concentrate foot traffic on a small number of boards and because the risers and stringers are closer to the ground, where moisture accumulates. Stair tread rot, detaching risers, and loose stair railings are all common repair calls.

Individual stair components can be replaced without rebuilding the full stair assembly in most cases. When the stringers the diagonal structural members that support the treads are rotted, a full stair rebuild is the right approach. We assess each stair case before recommending the repair scope.

When a Deck Needs Full Replacement

We will tell you honestly when a deck has reached the point where repair is not the right answer. The indicators: joists or framing members are rotted or compromised, footings have settled or failed, the ledger board has rotted away from the house, or so many boards need replacing that re-decking costs more than a new build. At that point, we transition the conversation to a new deck build or refer to a bonded deck contractor depending on the scope.

Dr. Steve’s Take:

Wood rot on a deck is not always visible from the surface. Dr. Steve covered this in a piece on the home repairs that catch people by surprise after a wet St. Louis winter boards that looked borderline in fall can be completely compromised by spring. The test is simple: press firmly with a screwdriver. Sound wood resists. Rotted wood yields. Do this test on every board you’re uncertain about before deciding between repair and replacement.

From Dr. Steve’s Tips: Let’s Soberly Celebrate St. Patrick, the Patron Saint of Home Repairs

314-434-4100

Call Now

Phones Answered 24/7

314-254-8006

Text Now

Online Form

Free Quote

FAQs

Deck Repair & Services in St. Louis

Deck Boards Rotting? Railing Loose? Ready to Stain?

FIX St. Louis handles every deck service from a single board replacement to a full new build. Firm quote before we touch anything. No minimum job size. Phones answered around the clock.

Contact FIX St. Louis — Deck

Call 314-434-4100 — Phones answered 24 hours a day, 7 days a week
Text 314-254-8006 — Text us anytime with questions or to schedule
FIX St. Louis • 50 River Bend Dr, St. Louis, MO 63017
CustomerService@FixSL.com
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