Page 95 - 2018 National Home Improvement

2018 National Home Improvement Estimator, All Rights Reserved Page 75

Changes to Roof Framing

Rafters. Flat, shed, or gable roofs, up to 5 in 12 slope (5/24 pitch), maximum 25' span. Figures in
parentheses indicate board feet per square foot 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 4", Std & Btr
2" x 4" rafters, 16" centers, per MBF --@.000 MBF 658.52 -- 658.52
12" centers (.89 BF per SF) B1@.021 SF 0.59 0.77 1.35
16" centers (.71 BF per SF) B1@.017 SF 0.46 0.62 1.08
24" centers (.53 BF per SF) B1@.013 SF 0.35 0.47 0.83
Remove and replace 2" x 4" rafter, per LF B1@.050 LF 0.45 1.82 2.28
2" x 6", Std & Btr
2" x 6" rafters, 16" centers, per MBF --@.000 MBF 674.68 -- 674.68
12" centers (1.29 BF per SF) B1@.029 SF 0.87 1.06 1.93
16" centers (1.02 BF per SF) B1@.023 SF 0.69 0.84 1.52
24" centers (.75 BF per SF) B1@.017 SF 0.51 0.62 1.13
Remove and replace 2" x 6" rafter, per LF B1@.068 LF 0.68 2.48 3.16
2" x 8", Std & Btr
2" x 8" rafters, 16" centers, per MBF --@.000 MBF 654.48 -- 654.48
12" centers (1.71 BF per SF) B1@.036 SF 1.12 1.31 2.43
16" centers (1.34 BF per SF) B1@.028 SF 0.88 1.02 1.90
24" centers (1.12 BF per SF) B1@.024 SF 0.74 0.88 1.61
Remove and replace 2" x 8" rafter, per LF B1@.087 LF 0.91 3.17 4.08
2" x 10", Std & Btr
2" x 10" rafters, 16" centers, per MBF --@.000 MBF 678.72 -- 678.72
12" centers (2.12 BF per SF) B1@.039 SF 1.43 1.42 2.86
16" centers (1.97 BF per SF) B1@.036 SF 1.33 1.31 2.65
24" centers (1.21 BF per SF) B1@.022 SF 0.82 0.80 1.62
Remove and replace 2" x 10" rafter, per LF B1@.098 LF 1.13 3.57 4.70
2" x 12", Std & Btr
2" x 12" rafters, 16" centers, per MBF --@.000 MBF 749.42 -- 749.42
12" centers (2.52 BF per SF) B1@.045 SF 1.89 1.64 3.53
16" centers (1.97 BF per SF) B1@.035 SF 1.47 1.28 2.75
24" centers (1.43 BF per SF) B1@.026 SF 1.07 0.95 2.02
Remove and replace 2" x 12" rafter, per LF B1@.113 LF 1.42 4.12 5.54
Add for hip roof B1@.007 SF -- 0.26 0.26
Add for slope over 5 in 12 B1@.015 SF -- 0.55 0.55

Roof frame jacking. Repair sag in ridge board by jacking and installing shoring supported by bearing
walls.
Per support installed B1@7.27 Ea 6.69 265.00 271.69

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 0.48 0.66 1.14
2" x 6" (1.10 BF per LF) B1@.028 LF 0.75 1.02 1.77
2" x 8" (1.47 BF per LF) B1@.038 LF 0.96 1.39 2.34
2" x 10" (1.83 BF per LF) B1@.047 LF 1.24 1.71 2.96
2" x 12" (2.20 BF per LF) B1@.057 LF 1.65 2.08 3.72

Collar beams & collar ties. Std & Btr grade, including 10% waste.
Collar beams, 2" x 6" B1@.013 LF 0.75 0.47 1.22
Collar ties, 1" x 6" B1@.006 LF 0.97 0.22 1.19