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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.