Wood rot is the number one deck problem in Central Texas. How to identify it, why it spreads, when it's a simple fix versus a structural repair, and what it costs to fix correctly.
Wood rot is caused by fungi that need three things: moisture, oxygen, and wood fibers to consume. Central Texas provides ideal cycling conditions — humid springs and fall rains soak the wood, summer heat incubates fungal growth, and shaded areas under decks never fully dry. Add clay soil that holds water against ground-contact posts, and you have the region's most common deck failure mechanism.
The pattern we see across Austin, Cedar Park, and Lakeway is consistent: rot starts at the wettest points — post bases, board ends, the ledger connection, stair stringers on grade, and anywhere leaves and debris trap moisture — then spreads outward through the framing.
Firmly probe wood at suspect locations. Sound wood resists penetration; rotted wood gives way easily, often with a soft crunch. Test post bases, board ends, around fasteners, and anywhere wood looks discolored.
Dark staining that doesn't dry out, wood surface that looks fibrous or cubed (cracking into small cube-like chunks is classic brown rot), visible fungal bodies or white fungal threads, and paint or stain that bubbles or flakes over damp wood underneath.
The most expensive rot is the rot you can't see. Board surfaces can look acceptable while the framing below is compromised — we regularly open up Austin decks for a "few bad boards" and find joists that need replacement. Soft or bouncy feel underfoot with visually okay boards is the classic hidden-rot signature. One Cedar Park project we documented started as visible board replacement and revealed extensive concealed framing rot once the surface came up.
Rule of thumb: visible rot is usually 60–70% of the actual rot. The moisture conditions that rotted what you can see have been working on adjacent wood too. Any rot repair should include probing the surrounding structure.
Epoxy wood hardeners and fillers have a legitimate place — cosmetic repair of small, shallow, fully-dried rot pockets in non-structural trim. They are not a repair for structural rot. Filler doesn't restore the load capacity of a joist or post; it hides the problem while the untreated moisture condition keeps working. On decks, the correct repair for structural rot is removing the compromised wood and replacing or sistering with new pressure-treated material — plus fixing the moisture source that caused it.
Every rot repair we do includes addressing why the wood got wet: adding or repairing flashing at the ledger, getting posts onto standoff bases out of soil contact, improving drainage under the deck, sealing board ends, and clearing debris traps. Replace the wood without fixing the moisture path and you'll repeat the repair in five years.
If your deck has soft spots, discoloration, or any of the signs above, we provide free on-site assessments throughout the Austin metro — including probing the structure to map how far rot actually extends before quoting the repair.
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