The risers need to be taller than the profile of the material you re cutting.
How to make a jig for cutting vinyl siding.
This piece is the handle.
Run the saw through once to create a kerf in the channel.
Cut 1 by 2 lumber to 3 inches long.
Homemade vinyl siding and soffit cutting jig constructed from lumber and steel.
Attach the riser boards to a large piece of plywood.
Put a piece of 1x1 on one of the 1x4s to act as a saw guide.
Place the narrow edge against the middle of the jig so it runs from side to side on the same side as the 1 by 3 piece that overlaps the jig end.
Intended for utilization with a circular saw.
Accommodates full length sidings and soffits.