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How to Extend a Raised Pitch Gable

Gable roofs have two sloping sides that meet at the ridge, so that when viewed from the end, they appear as a triangle. You may want to consider extending your gable roof pitch (steepness) to get rid of icing problems on your roof. The project may require that you order prefabricated roof trusses to replace the old ones as well as remodeling your wall to contain the extended gable roof pitch.

Things You'll Need

  • Roof trusses
  • New ridge board
  • Pry bar
  • 2-by-4 lumber
  • Hammer
  • Level
  • Circular saw
  • Oriented strand board (OSB) or water-board (WB)
  • Tape measure
  • 3-inch framing nails
  • Roof nails
  • Reciprocal saw
  • Roofing paper
  • Drinking straw
  • Hammer drill
  • Epoxy gun
  • Rebar rods (3 feet minimum)
  • Concrete epoxy
  • Concrete nails
  • Concrete
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Instructions

    • 1

      Determine the size of trusses to use. Measure the width of your walls with a measuring tape to find the width (hip) of area you want to cover. Also, measure the height (from the base to the peak of your old roof). Visit Final-analysis.com and use apply measurements to the roof calculator provided to determine the size for truss replacement.

    • 2

      Decide your new ratio for raising gable raise pitch. For instant, if your old pitch ratio was 3:12, you may consider raising it to 4:12.

    • 3

      Order four new prefabricated trusses from your local truss manufacturer using the measurements you have determined. Remove the old framing of your roof using a pry bar.

    • 4

      Determine the where you will need to dowel out (dig holes for setting rebar to tie old wall to new wall so as to add new concrete to existing concrete) from the existing wall for epoxy rebar (rods of steel used to reinforce the concrete). Since your old gable-end wall was pitched at 3:12, your new gable-end wall will use 4:12.

    • 5

      Drill a six inch hole into the existing concrete structure of the wall. Blow out all the dust from each hole with a drinking straw to clean it. Load your epoxy into an epoxy gun and use it to inject epoxy into the hole. Push pieces of rebar into the holes. Pour concrete around the new rebar and finish the extended wall. Allow it time to dry.

    • 6

      Mount the first truss to the existing gable end truss of your house and nail it using a hammer. Attach it to the cap boards on the sidewalls as well as the rafter or the last truss. Use a reciprocal saw to cut off the ridge-board and fix in new ridge-board.

    • 7

      Measure an interval of 24 inches on the new wall for the new trusses. Mount the trusses to the extended wall one after the other. Have your helper on the roof nail each truss securely one at a time once mounted.

    • 8

      Set a ridge-board (the same size with the old roof) in the spaces at the tops of the mounted trusses. Cut a board into 18 inch sections for the splices. Nail them across the joint of the new and the old ridge–board to secure them in place.

    • 9

      Install layers of oriented strand board (OSB) or waterboard (AB) to your new roof to sheathe it.

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