Repair Stone Window Sill !!top!! Page

Used for: Severe structural cracks, rotted ends, or extensive spalling where appearance is critical.

Historic stone masonry moves. It expands in heat and contracts in cold. Modern cement is rigid; it does not move. If you repair a flexible sandstone sill with rigid cement:

This technique uses a specialized repair mortar tinted to match the stone.

I gathered my supplies: a wire brush, a bucket of warm water with a little dish soap, a small angle grinder with a diamond cup wheel (borrowed from a skeptical neighbor), a can of masonry patching compound, a trowel, a spray bottle, and a stiff paintbrush. I also bought a stone hardener and a small bag of fine sand for texture.