13
Conventional Roof Modifications
Truss Frame Modifications
Allowable Spans for Trusses
2” x 4” Top Chord 2” x 6” Top Chord
24” O.C. Kickers
Bottom Chord
Pitch
Roof Material
21”
32”
X
2”x4” or 2”x6”
3:12¹
Tile
24”
36”
X
2”x4” or 2”x6”
3:12¹
Shake
25”
38”
X
2”x4” or 2”x6”
4:12²
Tile
28”
42“
X
2”x4” or 2”x6”
4:12²
Shake
28”
36”
X
2”x4” or 2”x6”
7:12³
Tile
30”
38”
X
2”x4” or 2”x6”
7:12³
Shake
NOTICE: For truss spans >36”, use double 2” x 6” kicker.
¹
Pitch of 3:12 or less
²
Pitch of 4:12 to 6:12
³
Pitch of 7:12 or greater
Determine the correct truss frame modification using the figures shown below.
