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.”
Have you repaired a window sill before? Share your experience or questions in the comments below. fixing rotted window sill
Fixing a rotted window sill is a quiet victory. It is the homeowner standing in the gap, holding back the wilderness, one piece of timber at a time. You pack the void
You tap the wooden sill, expecting the solid, dull thud of healthy timber, and instead, your knuckles disappear into a soft, spongy indentation. It sounds like knocking on rotten fruit. It is the sound of structure surrendering to entropy. You are telling the water, “Here is the
Dig out all soft, crumbly wood until you reach solid, sound material. Use a chisel, scraper, or rotary tool with a carving bit. The repair area should have clean, sharp edges—no loose fibers.
To fix it, you must first accept that you cannot "heal" the wood. You can only excise the necrosis.