Window sills take more abuse than almost any other surface in a room — they collect condensation, catch spills, and bear the weight of objects placed on them. When they deteriorate, they affect the entire window appearance.
Common Problems
Water damage from condensation or leaks is the most common sill failure. Rot typically starts at the front edge and works inward. Once rot has started, replacement is usually necessary rather than repair.
Material Choices
Solid wood sills can be sanded and refinished but are susceptible to moisture damage. Composite and PVC sills resist moisture but cannot be refinished if scratched. Stone sills — marble or granite — are the most durable but also the most expensive.