How to Frame a Gable Roof Soffit

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The gable roof is one of the simplest and most common roof framing styles. It features a triangular frame, with two angles, or rafters, running up to a point, connected by a horizontal joist running between the tops of the wall. The soffit extends out from the tops of the walls, below the lower edges of the roof. It is the horizontal section from the wall to the ends of the rafters underneath the joists of the gable.

Things You'll Need

  • 1-by-6-foot lumber
  • Tape measure
  • Pin nail gun
  • Circular saw
  • 1/4-inch thick plywood
  • 1-by-2-foot lumber
  • 1/8-by-3/4-inch screen molding
  • Pneumatic staple gun
  • Pneumatic pin nail gun
  • Start from one gable end and nail 1-by-6 lumber to the ends of the rafter tails, starting with the first piece flush with the outside face of the gable and running horizontally back to the opposite end of the roof, connecting the rafter tails. Cut each piece so that it ends in the center of a rafter tail. Nail the 1-by-6 to each rafter with two nails in each. Butt pieces up end to end. Measure and cut the last piece to run from the end of the next to last piece ending flush with the outside of the far gable. This is the fascia board.

  • Measure from the back of the fascia board to the wall, just under the rafters. Cut 1/4-inch thick, 4-by-8-foot sheets of plywood to width to fit between the wall and the fascia board. Leave the panels 8 feet long, trimming them to end on the center of the bottom of a joist. Cut enough plywood to cover the area between the gables, extending the full length of the fascia board.

  • Staple the plywood to the underside of the joists, starting at the same gable where you started the fascia. Drive at least three staples into each joist using a pneumatic staple gun. Put the next panel up to the first and staple each panel in the same way.

  • Install 1-by-2 lumber down the back edge of the fascia, with its wide face against the bottom of the plywood. Nail it in place with 1-1/4-inch nails with a pneumatic pin nail gun. Drive the nails up through the 1-by-2 into the plywood. Install full length pieces as far as possible. Measure and cut the last piece to fit between the last full piece and the inside of the far gable. Do the same along the wall.

  • Measure and cut a piece of 1/8-inch-thick-by-3/4-inch- wide screen molding to fit the seam between each plywood panel. Staple one strip covering each seam.

References

  • The Complete Guide to Roofing, Siding & Trim; Creative Publishing International; 2008
  • Roofing & Siding; Time-Life Books; 1989
  • Photo Credit woman standing on a roof image by forca from Fotolia.com
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