How To Repair A Rotted Window Sill [SAFE]

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Window sills take a beating. They sit flat, catching rain, snow, and the glaring sun, making them the most vulnerable part of your window assembly to rot. Ignoring a rotted sill can lead to significant structural damage, as the rot can spread to the window frame, the wall sheathing, and eventually the interior of your home. how to repair a rotted window sill

Repairing the sill fixes the symptom, but you need to ensure the rot doesn't return. 🛠️ 🪵 Window sills take a beating

1️⃣ – Use a 5-in-1 tool or flathead screwdriver to dig out loose, decayed wood. 2️⃣ Treat the area – Apply wood hardener to stop remaining rot and prep for filler. 3️⃣ Fill deep holes – Use two-part epoxy wood filler (not standard putty). Overfill slightly. 4️⃣ Shape & sand – Once cured (24h), sand flush with the original profile. 5️⃣ Prime & paint – Use exterior primer + paint to seal against future moisture. 6️⃣ Add drip edge – Caulk the underside joint to shed water away. Repairing the sill fixes the symptom, but you