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The wood is spongy throughout, the rot has spread into the wall studs, or the sill is structural and sagging. Professionals like Argo Window Repair estimate that simple epoxy repairs cost $150–$225, while full replacements can reach $750. Required Tools and Materials
: Use a screwdriver or awl to press into the wood. Healthy wood is solid; rotted wood will feel soft, spongy, or crumbly. Gather Materials : how to repair a rotted exterior window sill
Technical Guide: Repairing a Rotted Exterior Window Sill Repairing a rotted window sill is a critical maintenance task that prevents water from infiltrating your home's structure. For minor to moderate rot, a professional-grade repair using is the standard for long-lasting results, as it bonds chemically with wood and remains flexible. Decision Matrix: Repair vs. Replace The wood is spongy throughout, the rot has