How to Build a Vinyl Siding Cutting Jig


Vinyl siding can be cut using tools including tin snips and utility knives, but if you have a lot of siding to install, you will need a way to make a lot of square end cuts efficiently. That's where the siding cutting jig comes in. A plywood jig, able to hold up to 12-inch material, can be used to crosscut almost any material quickly and accurately.

Things You'll Need

  • ¾-inch medium-density fiber core
  • Table saw
  • Tape measure
  • 1-by-2 lumber
  • C-clamps
  • Framing square
  • ¼-inch hardboard
  • Wood glue
  • Pneumatic stapler
  • Pneumatic pin nail gun
  • Drill
  • No. 2 screw tip
  • Drywall screws
  • Quick grip clamps
  • Cut a piece of medium-density fiber core, or MDF, 13½ by 48 inches, using a table saw. Cut two pieces of 1-by-2 lumber 48 inches long and one piece 16 inches long on a miter saw. Cut a piece of ¼-inch hardboard 6 by 16 inches.

  • Glue and screw the long 1-by-2s along the long edges of the MDF, standing on one narrow edge. Align the 1-by-2s flush with the outside edges of the piece. Clamp the pieces in place with C-clamps. Use 1¼-inch fine thread drywall screws. Install the screws through the MDF into the edge of the 1-by-2 every 8 to 10 inches.

  • Glue and staple the hardboard to the 16-inch 1-by-2 with one long edge of the hardboard flush with one long edge of the 1-by-2. Position the 1-by-2 with its wide face against the hardboard, flush with the edge. Use the C-clamps to hold this in place while you staple through the hardboard into the 1 by 2. This is your cutting fence. Use a framing square to situate the cutting fence perpendicular to the MDF jig bed, with the 1-by-2 rails of the bed piece facing up, so that the hardboard panel of the fence rests on the 1-by-2s with the 16-inch 1-by-2 on top, perpendicular to the rails of the bed piece.

  • Situate the fence 12 inches from the right end of the bed, with the 1-by-2 up and to the right. Nail the fence into the tops of the 1-by-2 rails on the MDF rails. Staple through the hardboard into the tops of the 1-by-2s. Drive a single screw through the 1-by-2 on the fence into each bed rail to reinforce it.

  • Set the saw with the motor side edge of the base plate against the edge of the 1-by-2 fence rail on top of the fence. Set the saw's depth set so that it will cut through the hardboard and the 1-by-2 bed rails, and groove the MDF 1/8 inch. Start the saw and cut across the jig, cutting through the hardboard and the 1-by-2 rails on the bed and grooving the base.

  • Align material to be cut with the far rail of the jig, sliding it under the fence. Align the mark the material will be cut on directly under the edge of the hardboard fence piece. Use a quick grip clamp to hold the material in place. Make your cut by running the saw's base plate against the 1-by-2 rail on top of the fence, with its blade riding along the edge of the hardboard.

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