Rafters (cont.) Flat, shed, or gable roofs, up to 5 in 12 slope (5/24 pitch), maximum 25' span. Figures in parentheses indicate board feet per SF of actual roof surface area (not roof plan area), including rafters, ridge boards, collar beams and normal waste, but no blocking, bracing, purlins, curbs, or gable walls.
  2" x 6", Std & Btr [view picture]
    2" x 6" rafters, per MBF — MBF 617.00 — 617.00
    12" centers (1.29 BF per SF) B1@.029 SF .80 .97 1.77
    16" centers (1.02 BF per SF) B1@.023 SF .63 .77 1.40
    24" centers ( .75 BF per SF) B1@.017 SF .46 .57 1.03
  2" x 8", Std & Btr
    2" x 8" rafters, per MBF — MBF 598.00 — 598.00
    12" centers (1.71 BF per SF) B1@.036 SF 1.02 1.20 2.22
    16" centers (1.34 BF per SF) B1@.028 SF .80 .93 1.73
    24" centers (1.12 BF per SF) B1@.024 SF .67 .80 1.47
  2" x 10", Std & Btr
    2" x 10" rafters, per MBF — MBF 630.00 — 630.00
    12" centers (2.12 BF per SF) B1@.039 SF 1.34 1.30 2.64
    16" centers (1.97 BF per SF) B1@.036 SF 1.24 1.20 2.44
    24" centers (1.21 BF per SF) B1@.022 SF .76 .73 1.49
  2" x 12", Std & Btr
    2" x 12" rafters, per MBF — MBF 707.00 — 707.00
    12" centers (2.52 BF per SF) B1@.045 SF 1.78 1.50 3.28
    16" centers (1.97 BF per SF) B1@.035 SF 1.39 1.17 2.56
    24" centers (1.43 BF per SF) B1@.026 SF 1.01 .87 1.88
Add for hip roof B1@.007 SF — .23 .23
Add for slope over 5 in 12 B1@.015 SF — .50 .50
Trimmers and curbs At stairwells, skylights, dormers, etc. Figures in parentheses show board feet per LF, Std & Btr grade, including 10% waste.
  2" x 4" ( .73 BF per LF) B1@.018 LF .44 .60 1.04
  2" x 6" (1.10 BF per LF) B1@.028 LF .68 .93 1.61
  2" x 8" (1.47 BF per LF) B1@.038 LF .88 1.27 2.15
  2" x 10" (1.83 BF per LF) B1@.047 LF 1.15 1.57 2.72
  2" x 12" (2.20 BF per LF) B1@.057 LF 1.55 1.90 3.45
Collar beams & collar ties Std & Btr grade, including 10% waste
  Collar beams, 2" x 6" B1@.013 LF .68 .43 1.11
  Collar ties, 1" x 6" B1@.006 LF 1.03 .20 1.23
Purlins (Purling) Std & Btr, installed below roof rafters. Figures in parentheses indicate board feet per LF including 5% waste.
  2" x 4" ( .70 BF per LF) B1@.012 LF .42 .40 .82
  2" x 6" (1.05 BF per LF) B1@.017 LF .65 .57 1.22
  2" x 8" (1.40 BF per LF) B1@.023 LF .84 .77 1.61
  2" x 10" (1.75 BF per LF) B1@.027 LF 1.10 .90 2.00
  2" x 12" (2.10 BF per LF) B1@.030 LF 1.48 1.00 2.48
  4" x 6" (2.10 BF per LF) B1@.034 LF 1.80 1.13 2.93
  4" x 8" (2.80 BF per LF) B1@.045 LF 2.38 1.50 3.88
Dormer studs Std & Btr, per square foot of wall area, including 10% waste
  2" x 4" ( .84 BF per SF) B1@.033 SF .51 1.10 1.61
Roof trusses 24" OC, any slope from 3 in 12 to 12 in 12, total height not to exceed 12' high from bottom chord to highest point on truss. Prices for trusses over 12' high will be up to 100% higher. Square foot (SF) costs, where shown, are per square foot of area to be covered.
  2" x 4" top and bottom chords
    Up to 38' span B1@.022 SF 2.94 .73 3.67
    40' to 50' span B1@.028 SF 3.67 .93 4.60

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