Floor joists (cont.) Per SF of area covered. Figures in parentheses indicate board feet per square foot of floor including box or band joist, typical double joists, and 6% waste. No beams, blocking or bridging included. Deduct for openings over 25 SF. Costs shown are based on a job with 1,000 SF of area covered. For scheduling purposes, estimate that a two-man crew can complete 750 SF of area per 8-hour day for 12" center to center framing; 925 SF for 16" OC; 1,100 SF for 20" OC; or 1,250 SF for 24" OC.
2" x 12" Std & Btr
    2" x 12" floor joists, per MBF — MBF 707.00 — 707.00
    12" centers (2.56 BF per SF) B1@.026 SF 1.81 .87 2.68
    16" centers (2.05 BF per SF) B1@.021 SF 1.45 .70 2.15
    20" centers (1.77 BF per SF) B1@.017 SF 1.25 .57 1.82
    24" centers (1.56 BF per SF) B1@.015 SF 1.10 .50 1.60
Floor joist wood, TJI truss type Suitable for residential use, 50 PSF floor load design. Costs shown are per square foot (SF) of floor area, based on joists at 16" OC, for a job with 1,000 SF of floor area. Figure 1.22 SF of floor area for each LF of joist. Add the cost of beams, supports and blocking. For scheduling purposes, estimate that a two-man crew can install 900 to 950 SF of joists in an 8-hour day.
      9-1/2" TJI/15 B1@.017 SF 2.23 .57 2.80
  11-7/8" TJI/15 B1@.017 SF 2.45 .57 3.02
  14" TJI/35 B1@.018 SF 3.54 .60 4.14
  16" TJI/35 B1@.018 SF 3.88 .60 4.48
Bridging or blocking Installed between 2" x 6" thru 2" x 12" joists. Costs shown are per each set of cross bridges or per each block for solid bridging, and include normal waste. The spacing between the bridging or blocking, sometimes called a “bay,” depends on job requirements. Labor costs assume bridging is cut to size on site.
  1" x 4" cross [view picture]
    Joist bridging, per MBF — MBF 1,750.00 — 1,750.00
    Joists on 12" centers B1@.034 Ea .87 1.13 2.00
    Joists on 16" centers B1@.034 Ea 1.19 1.13 2.32
    Joists on 20" centers B1@.034 Ea 1.51 1.13 2.64
    Joists on 24" centers B1@.034 Ea 1.83 1.13 2.96
  2" x 6" solid, Std & Btr [view picture]
    2" x 6" blocking, per MBF — MBF 617.00 — 617.00
    Joists on 12" centers B1@.042 Ea .68 1.40 2.08
    Joists on 16" centers B1@.042 Ea .90 1.40 2.30
    Joists on 20" centers B1@.042 Ea 1.13 1.40 2.53
    Joists on 24" centers B1@.042 Ea 1.36 1.40 2.76
  2" x 8" solid, Std & Btr
    2" x 8" blocking, per MBF — MBF 598.00 — 598.00
    Joists on 12" centers B1@.042 Ea .88 1.40 2.28
    Joists on 16" centers B1@.042 Ea 1.17 1.40 2.57
    Joists on 20" centers B1@.042 Ea 1.46 1.40 2.86
    Joists on 24" centers B1@.042 Ea 1.75 1.40 3.15
  2" x 10" solid, Std & Btr
    2" x 10" blocking, per MBF — MBF 630.00 — 630.00
    Joists on 12" centers B1@.057 Ea 1.15 1.90 3.05
    Joists on 16" centers B1@.057 Ea 1.54 1.90 3.44
    Joists on 20" centers B1@.057 Ea 1.92 1.90 3.82
    Joists on 24" centers B1@.057 Ea 2.31 1.90 4.21

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