After hundreds of jobs around our area, rotten siding is one of the problems we wish homeowners caught sooner — because caught early it is a small repair, and caught late it is a wall. We see it in homes across our area, and it almost always starts the same quiet way: water getting behind the surface and staying there. Here is how to spot it before it spreads.
The signs to look for
Walk your house on a dry day and look closely, especially at the bottom courses of siding, the corners, and the north side that stays damp longest. The warning signs are soft spots that give when you press them, paint that bubbles, blisters, or peels in one area while the rest looks fine, boards that look crumbly, wavy, or swollen, and gaps opening up at the joints where boards meet. Any one of those means water has been sitting where it should not.
The simple probe test
Paint can hide rot for a long time, so do not trust your eyes alone. Press a screwdriver gently into any board that looks suspect — healthy wood is firm and resists, rotted wood feels spongy and lets the tip sink in. Check along the bottom edge of boards, around window and door trim, and anywhere sprinklers hit the wall or soil and mulch sit high against the siding. Five minutes with a screwdriver tells you more than a season of guessing.
Why rot spreads behind the surface
Siding is a shell, not a seal. Once water slips behind a cracked joint, a failed paint film, or a gap at the trim, the back of the board and the sheathing underneath stay wet — and wet wood is food for the fungi that cause rot. From the street the board can still look painted and straight while the damage quietly widens behind it, board to board and down into the framing. That is why a small soft spot so often turns out to be a bigger soft area once the board comes off.
Section repair or full replacement?
When the rot is caught in one or two boards, a section repair works well: we cut out the damaged boards, check and repair what is behind them, and fit new boards that match the profile, then prime and paint so the patch disappears. Replacement of a whole wall — or the whole house — is for rot that has been spreading for years, where most boards on a side are soft or the damage has reached the framing. The honest answer depends on what the probe test finds, which is why an early look matters: early almost always means a section, not a side.
What happens if you leave it
Rot does not stay outside. Left alone, moisture works through the wall and shows up inside as soft, stained walls — that becomes a drywall repair on top of the exterior work — and as peeling paint that no amount of repainting will fix until the wet wood behind it is dealt with, which is where our interior painting service comes in after the wall is sound again. It also invites pests that love damp wood. Every wet season you wait, the repair gets bigger.
How to stay ahead of it
- Probe the bottom courses, corners, and north side of your siding every fall.
- Keep paint and caulk in good shape — they are the first line of defense.
- Keep soil, mulch, and firewood off the siding, and aim sprinklers at the yard, not the wall.
- Fix overflowing gutters and short downspouts fast — water dumped at the base is the number one rot starter.
- Our Home Care Plan includes a whole-home walkthrough with photos, so small exterior problems like this get flagged before they turn into projects.
FAQs
Can I just paint over a soft spot?
No. Paint over rot seals moisture in and the rot keeps spreading underneath — the paint will bubble and fail again within a season. The soft wood has to come out first.
How fast does siding rot spread?
In our wet climate, a board that gets wet every rain and never fully dries can go from a small soft spot to a failed section in a couple of seasons. Shaded, north-facing walls go fastest.
Does homeowners insurance cover rotted siding?
Usually not — rot from slow, long-term moisture is considered a maintenance issue. That is another reason catching it early, while it is still a small section repair, matters.
Book Your Visit
Found a soft spot or bubbling paint? We can help you with that at Pro Touch — book your appointment or call/text (253) 298-9025. Licensed · Bonded · Insured — WA Reg. #PROTOTH762KL.