Siding Rot Repair & Replacement

In Seattle's wet climate, siding rot isn't just cosmetic — it's a structural threat that often starts hidden behind your siding. What begins as a small soft spot can escalate to $10,000+ in framing damage if left unchecked.

Spot Rot Early — Before It Spreads

Seattle's constant moisture means rot often starts where you can't see it — behind siding, around windows, or at the base of walls.

Check your home today:

• Probe suspicious areas with an awl or screwdriver — if it penetrates easily, rot is present¹
• Inspect after heavy rains for discoloration, soft spots, musty smells, or bubbling paint
• Pay extra attention to north-facing walls, areas near gutters, and where siding meets trim or the roofline

Why speed matters: Rot spreads 2–3x faster in our damp climate¹. What looks like surface damage often hides extensive decay underneath.

How we fix it: We remove or repair the damaged areas while protecting your housewrap moisture barrier². Once repairs are complete, we seal and caulk every joint to prevent future moisture intrusion. Common in Seattle's Ballard bungalows (1920s–40s), Magnolia cedar homes, and Rainier Valley craftsman builds.

Best time for repair: Late summer (August–September) when walls are driest.

How Water Damage Happens in Seattle

Even with careful installation, water finds its way through gaps, cracks, or the natural expansion and contraction of wood siding⁵. Seattle's heavy rainfall and moisture-rich environment accelerate this process.

Warning signs to watch for:

• Warped or buckled siding panels
• Dark staining or discoloration on exterior walls
• Peeling paint, especially near the base of walls
• Musty smell near exterior walls — this may indicate mold growth inside the wall cavity

Health concern: Water-damaged siding can lead to mold growth inside walls — a particular concern for Seattle families with allergies or asthma.

Our repair approach: We identify the full extent of the damage, replace affected sections, and verify that the weather-resistive barrier (housewrap) is intact to prevent future moisture intrusion⁶. We don't just patch the surface — we trace the water path to fix the root cause.

When a siding panel is damaged beyond repair, prompt replacement prevents moisture from reaching the wall structure underneath.

Our process:

1. Careful removal — we use a specialized siding removal tool to disengage the panel without damaging surrounding materials or the underlying weather-resistive barrier⁹
2. Inspection — once the panel is off, we inspect the sheathing and housewrap for hidden damage
3. Precise installation — the new panel is aligned with existing siding and secured with corrosion-resistant nails for a tight, weatherproof fit¹⁰
4. Seal and finish — all edges and joints are sealed to prevent future water intrusion

If you notice cracked, warped, or loose siding panels, schedule an inspection before the next rainy season — small gaps become big problems in Seattle weather.

Wall framing rot behind siding is the most serious form of moisture damage — and Seattle homes are particularly vulnerable due to our year-round rain exposure and poor drainage conditions.

How we diagnose it: We use a pocketknife awl to gently probe siding and trim. If the awl penetrates easily, rot is likely present in the framing behind¹³.

What the repair involves:

• Siding removal to access the underlying framing
• Rotten framing replacement — damaged sections are cut out and replaced with new treated wood, properly sealed against future moisture¹⁴
• Barrier repair — we inspect and repair any damaged weather-resistive barriers (housewrap) to prevent further moisture penetration
• Complete reassembly with proper flashing and drainage to address the root cause

Don't ignore the warning signs. What looks like a small cosmetic issue on the outside often hides extensive framing damage behind your siding. The longer you wait, the more expensive the repair.