How to Trim a Marble Window Sill
- 1). Measure the length of a window sill with a tape measure.
- 2). Pull the tape measure along a marble window sill. Mark the center of the sill with a wax crayon.
- 3). Divide the window sill measurement by two. Align the end of the tape measure with the center mark made with the wax crayon. Place a mark at the dimension on the tape measure determined by dividing the window sill measurement by two with the wax crayon. Make a second mark on the other side of the center line.
- 4). Make a line at the two off center crayon marks by aligning one edge of a carpenter's square with each mark and pulling the wax crayon across the face of the marble sill.
- 5). Cover the face of the sill on either side of the crayon line with blue painter's tape.
- 6). Align a circular saw with a masonry blade with one of the lines. Pull the trigger of the circular saw. Spray the spinning blade with water from a water-filled spray bottle as you cut to reduce the amount of dust created by the cut. Cut the other marked line as described.
- 7). Wipe the water from the marble sill with a rag. Pull the blue painter's tape from the cut area before installing the cut marble sill.