Step 3. Making the roof frame

Cut all roof frame pieces to the dimensions as shown in the picture. Use 75x50 (2"x3") treated, or natural decay-resistant, sawn lumber.

In total, cut 5 rafters @ 1900mm (74-3/4"), 5 rafters @ 1310mm (51-1/2") and 5 uprights @ 500mm (19-5/8") with end angle cuts as shown in the drawing.

Also cut five triangular gussets 500mm (19-5/8") x 500mm (19-5/8") x 500mm (19-5/8") from a sheet of 10mm 3/8" treated plywood

On an even surface make up the five roof frames to the pattern and dimensions as shown in above drawing. Ensure the two furtherest points are 2400mm (94-1/2") apart and then nail the triangular gussets in place with galvanized flathead nails spaced about 50mm (2") apart: one gusset to each roof frame.

Lift the 5 roof frames in place on top of the side walls: one roof frame to each end of the side walls and the other three spaced evenly in between. Fix the roof frames to the side wall top plate with galvanized nails.

Temporarily prop the two end roof frames plumb (vertical).

Nail the fascia board 25x150 (1"x6") to the top of the roof frames (see drawing next page) making sure all the roof frames are vertical and parallel with each other.

Fix the window support plate 75x50 (2"x3") in place under the roof frame apex and behind the fascia board. See drawing next page.

Brace the roof on the side that has no windows. Nail metal strapping from the apex of both end roof frames down to the middle of the side wall top plate.