Sandstone — Window Sill Repair

For loose, flaking stone, a conservationist’s approach is best: carefully remove the loose material back to a sound substrate. Do not be tempted to paint over crumbling stone; moisture trapped behind paint will turn the sill into mush within a few years.

Poor drainage or failed sealants allow water to pool, leading to stains, mold, or structural rot. sandstone window sill repair