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