Can Sill-Masters sills be installed on top of marble sills?
In most cases, Sill-Masters sills can be installed directly on top of existing marble sills. If the thickness of the existing sill is 5/8″ or less, the finished edge of the Sill-Masters sill will completely cover the marble. When measuring for Premimum Sills, the Sill-Masters sill must be at least 1-inch deeper than the existing marble sill and at least 2-inches longer.