Wood Rot Inspection Checklist: 20 Things to Check Before It Gets Worse
Most St. Louis homeowners don't discover wood rot until it's already structural — and structural repairs cost 3–5x more than early-stage repairs. Use this checklist to catch rot while it's still a simple fix.
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Preview — First 4 of 20 items
- Check window sills for soft spots or paint bubbling
- Press firmly around window frames — spongy wood indicates rot
- Press bottom of exterior door frames — most rot starts here
- Poke deck boards near railing posts with screwdriver
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Get the Full 20-Point Checklist
All five zones, 20 inspection points, plus the "when to call a pro" guide.
When to Call a Professional
This checklist helps you identify the presence of wood rot — but identifying it is only the first step. If your screwdriver probe sinks more than a quarter inch into any framing member, joist, sill plate, or load-bearing post, stop and call a professional before doing anything else. Structural rot that spreads to adjacent framing can turn a $400 repair into a $4,000 project within a single wet season.
Cosmetic trim rot — window casing, corner boards, fascia, decorative molding — can sometimes be stabilized with penetrating epoxy consolidant followed by filler. However, this is a temporary solution if the water source hasn't been addressed. A professional inspection identifies both the rot and the entry point causing it, stopping the cycle rather than patching symptoms.
If you found soft spots in your deck ledger board, any joist ends, or at the base of load-bearing posts, treat those as urgent. The ledger board holds your deck to your house — failure there is a collapse risk. For wood rot repair in St. Louis, our team provides free inspections with no obligation.
Found something on the checklist?
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Frequently Asked Questions
How do I know if I have wood rot?
The most reliable field test is the screwdriver probe: press a flathead screwdriver firmly into any suspect wood. If it sinks in with little resistance, the fibers have broken down and rot is present. Visual signs include discoloration, paint bubbling, soft or spongy texture, and visible fungal growth.
What areas of my home are most vulnerable to wood rot?
The highest-risk zones are areas where wood stays wet: window sills and frames, exterior door frames (especially the bottom), deck boards near railing posts, fascia boards behind gutters, and siding at the foundation splash zone. These areas collect water and rarely dry completely.
Can I repair wood rot myself, or should I call a professional?
Surface-level cosmetic rot on trim pieces can sometimes be DIY-repaired with epoxy filler. However, structural rot — in joists, sill plates, deck ledger boards, or load-bearing posts — requires professional assessment. Attempting structural repairs without proper knowledge can create safety hazards and void homeowner's insurance coverage.