Repairing A Rotted Window Sill Guide

If you find extensive rot, soft studs, or visible mold inside the wall, call a professional. Otherwise, roll up your sleeves—you’ve got this.

Once fully cured (usually overnight), sand the repair flush with the original wood. Start with 80-grit to shape, finish with 150–220 grit for a smooth surface. repairing a rotted window sill

Brush a penetrating wood hardener onto the exposed solid wood. This strengthens the remaining fibers and helps the filler bond. Let it cure per manufacturer instructions (usually 2–4 hours). If you find extensive rot, soft studs, or

Before starting, gather these items to ensure a seamless repair: How to Repair Dry Rot in a Window Sill If you find extensive rot