Quick Answer
Look for soft, spongy, cracked, or darkened wood, especially at the bottoms of door frames, window sills, trim near the ground, and fascia behind gutters. Rotted wood has to be cut out and replaced, then sealed and painted. Paint alone won't stop it.
Wood rot is the single most common issue we find on Kansas City exteriors. It's also one of the most misunderstood. Most homeowners don't know they have it until we press a screwdriver into a piece of trim and it sinks right in.
Here's where rot hides, how to spot it early, and what a proper repair looks like.
What Causes Wood Rot?
Rot is caused by fungi that break down wood fibers. They need moisture to grow, so rot always starts where wood stays wet. Sound paint and caulk keep water out. Once paint peels or caulk cracks, water soaks into the wood and doesn't dry out, especially on shady sides of the house.
Where Rot Hides On Kansas City Homes
- Bottoms of door frames and brick mold, where water runs down and sits on the step or threshold
- Garage door jambs and trim, especially near the driveway
- Window sills and the bottom corners of window trim
- Fascia boards behind gutters that overflow or leak
- Siding near the ground, decks, and roof lines where splash-back and snow sit
- Corner boards and trim joints where caulk has failed
- Chimney chases wrapped in wood siding
Warning Signs To Look For
- Peeling or bubbling paint in one area while the rest of the wall looks fine
- Cracked, missing, or pulled-away caulk at joints and corners
- Dark staining or discoloration at the ends of boards
- Swollen or flaking siding edges, common on hardboard
- Soft spots: wood that gives when you press it with a thumb or screwdriver
- Gaps or warping where boards used to fit tightly
Quick test: gently press a flat-head screwdriver into the bottom of a door frame or trim board. Sound wood resists. Rotted wood feels spongy, and the tip sinks in.
Can You Just Fill It And Paint Over It?
Very small areas of surface damage can sometimes be repaired with epoxy. But once rot has gone soft or deep, it needs to be cut out and replaced. Painting over rot seals moisture in, and the damage keeps spreading underneath your new paint. It's one of the most common shortcuts we see from other contractors, and it's why some paint jobs fail in a couple of years.
How A Proper Repair Works
- Find it. We probe trim and siding during the estimate and point out every soft spot we find.
- Cut back to solid wood. Rotted material comes out completely. If removing a board reveals more damage, we show you photos before doing extra work.
- Choose the right material. We match your home or upgrade wet areas to something more durable.
- Install and seal. New boards are fastened, flashed where needed, and caulked.
- Prime and paint. Everything is primed and painted with the rest of the house so the repair disappears.
Replacement Materials, Compared
| Material | Best for | Notes |
|---|---|---|
| Cedar | Natural wood homes, custom profiles | Naturally rot-resistant, takes paint well when primed |
| LP SmartSide | Matching engineered siding and trim | Treated engineered wood; common on newer KC homes |
| James Hardie | Siding and trim in wet areas | Fiber cement; won't rot, very durable |
| PVC trim | Door frames, ground-level trim, fascia | Won't absorb water; ideal where wood keeps failing |
The Best Time To Fix Rot Is During A Repaint
Wood repair and painting go hand in hand. When repairs are done as part of an exterior repaint, everything gets primed, caulked, and painted at once, and it's all covered by one warranty. It's also the most cost-effective time to catch small problems before they spread.
Learn more about our wood rot and siding repair, or schedule a free inspection.
Frequently Asked Questions
Does Homeowners Insurance Cover Wood Rot?
Usually not. Most policies treat rot from long-term moisture as maintenance, but read your policy or ask your agent to be sure.
Can Wood Rot Be Fixed With Filler Instead Of Replacement?
Very small spots sometimes can. Most of the rot we find has spread past what filler can hold, so we replace the board for a repair that lasts.
How Fast Does Wood Rot Spread?
It depends on how wet the area stays. A soft spot left over one rainy spring and a freeze-thaw winter can turn a single-board repair into several.
Cade Zerr is the owner of Arrowhead Painting KC, leading a team with more than 35 years of combined painting experience. More about Cade