These sills are designed to work with external insulation and give the appearance of a traditional stone or concrete sill.

Our oversill has an excellent insulation value, this improves the overall insulation value of a building by reducing the cold bridging at the point where the sill and window meet.

A Passive sills oversill is a perfect addition to any external insulation project give you a traditional appearance it also has far superior acoustic properties than an aluminium sill during heavy rain and hailstone.

Our oversills are available in sandstone, white granite and grey granite effect finishes.