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You pack the void. You shape the epoxy to match the slope of the sill, the curve of the profile. You are sculpting. You are telling the water, “Here is the shape you cannot follow.”
Once the epoxy is fully cured (check the label—typically 12–24 hours), sand flush with the surrounding wood. Start with 80 grit, finish with 120 grit. The repair should feel seamless to the touch.
Here is where the philosophy of repair shifts to the philosophy of craft. fixing rotted window sill
A rotted window sill is more than just a cosmetic eyesore; it can compromise your home’s structural integrity by allowing water to seep into the walls. Fortunately, if caught early, most rot can be fixed without a full window replacement.
Pro tip: Cut back an extra 1/4 inch into healthy wood. Rot spreads like cancer; if you leave any behind, it’ll come back. You pack the void
Run a bead of exterior caulk along the seam where the sill meets the window frame and side jambs. This stops water from seeping into the end grain—the #1 cause of rot.
Before starting, determine the extent of the damage. If only surface-level cracks or minor soft spots exist, a repair is viable. You are telling the water, “Here is the
When the job is done, you run your hand over the sill. It is cool, smooth, and impenetrable. It looks as if it has always been there.
Brush or spray wood hardener onto the exposed area. It soaks into remaining fibers and consolidates them. Let it cure per manufacturer instructions (usually 2–4 hours).