The short answer
Signs of Rotting Wood Siding
You can often spot rot before it spreads too far. Press a flathead screwdriver or a dull knife against the siding. If the wood gives way easily or feels soft, rot is likely present. Also look for discolored areas, especially dark brown or black stains that might indicate moisture has soaked in.
Peeling or bubbling paint is another clue. When water gets behind the paint film, it loses adhesion and starts to lift. Check the bottom edges of each board, where they meet the next row, and the corners near trim. Those spots collect water and stay damp longer.
Bulges or warped boards can also signal trouble. Rotting wood swells as it breaks down, causing the siding to push outward. If you see any of these signs, do not ignore them. The longer the rot sits, the more it spreads, and the more expensive the repair gets.
What Causes Wood Siding to Rot
Rot needs moisture and time. When rain or sprinkler water hits your siding and cannot dry out, the wood starts to decay. Common problem areas include spots where gutters leak, where downspouts splash against the wall, and where shrubs or soil touch the siding and hold moisture against it.
Poor installation can also trap water. If the siding was not installed with proper gaps for expansion, or if the flashing around windows and doors is missing or damaged, water can work its way behind the boards. Once it is trapped there, the rot begins from the inside out.
Even well-maintained homes can develop rot over time. The key is catching it early. If you notice any of the signs, investigate the source of the moisture. Fixing the leak or improving drainage can stop the rot from getting worse.
What to Do If You Find Rot
Act quickly once you spot rot. The first step is to stop the water source. Clean out gutters, redirect downspouts, or fix a leaking sprinkler. Then remove any rotted boards carefully, because they can harbor mold spores. Wear gloves and a dust mask if you plan to do the removal yourself.
After removing the rotted wood, let the area dry out completely before installing new siding. Use a moisture meter to confirm the surrounding wood is dry. If the rot extends behind the siding into the sheathing or framing, you may need to remove more material. That is when you should call in local water damage pros to assess the structural impact.
Preventing Future Rot in Wood Siding
Keep the siding dry and allow it to breathe. Trim back any shrubs or plants so they do not touch the wood. Maintain at least a few inches of clearance between the soil and the bottom edge of the siding. Clean your gutters at least twice a year so water flows away from the house.
Inspect the caulking around windows, doors, and corner trim each season. Replace any cracked or missing caulk promptly. After heavy rainstorms or snowmelt, check the siding for signs of moisture. Also, make sure the ground slopes away from your foundation so water does not pool against the wall.
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Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (801) 383-0232Frequently asked questions
Can I paint over rotted wood siding?
You can paint over it, but the rot will continue to spread underneath the paint. The moisture stays trapped, and the wood keeps decaying. You need to remove the rotted sections and replace them with new wood before painting. Otherwise, you are just hiding the problem.
How do I know if the rot is just on the surface or deep?
Press on the wood with a screwdriver. If the tip sinks in more than a quarter inch, the rot is likely deep. You can also tap the siding with a hammer. A hollow sound suggests the wood has decayed underneath. A moisture meter gives a more precise reading of how wet the wood is.
Should I replace just the rotted boards or the whole wall?
It depends on how far the rot has spread. If only a few boards are affected and the framing behind them is dry, you can replace just those pieces. But if the rot has reached the sheathing or framing, the repair is larger. A professional inspection can tell you the exact extent.