Flat roof assembly Based on using 2" x 12" joists Std & Btr grade at 16" on center including blocking, ripped strips and normal waste. The roof surface is built-up 3 ply asphalt consisting of 2 plies of 15 lb. felt hot mopped with a 90 lb. mineral-coated cap sheet.
    Using 2" x 12" joists at — MBF 708.00 — 708.00
    Using 2" x 8" joists at — MBF 598.00 — 598.00
    Using 1/2" CDX plywood at — MSF 631.00 — 631.00
    Using 7/16" OSB at — MSF 345.00 — 345.00
  Flat roof assembly as described above
    Framing, with plywood sheathing B1@5.00 Sq 241.00 167.00 408.00
    Framing, with OSB sheathing B1@5.00 Sq 211.00 167.00 378.00
    Built-up roofing, 3-ply and gravel R1@2.15 Sq 98.80 76.30 175.10
Conventionally framed roof assemblies Based on straight gable type roof (no hips, valleys, or dormers) with 6" in 12" rise or less. Cost per 100 square feet of plan area under the roof, not actual roof surface area. Framing includes 2" x 8" common rafters Std & Btr grade at 24" on center. Cost includes blocking, ridge and normal bracing. Roof sheathing is either 7/16" OSB (oriented strand board) or 1/2" CDX plywood.
Conventionally framed roof assembly. Select roof finish from below
  Framing, with plywood sheathing B1@4.10 Sq 135.00 137.00 272.00
  Framing, with OSB sheathing B1@4.10 Sq 105.00 137.00 242.00
  Add for built-up 3-ply finish roofing R1@1.25 Sq 94.10 44.40 138.50
  Add for composition shingle (Class C) roofing R1@1.83 Sq 272.00 64.90 336.90
  Add for asphalt shingle (Class A) roofing R1@1.83 Sq 177.00 64.90 241.90
  Framing, with no sheathing B1@2.80 Sq 68.90 93.30 162.20
  Add for 26 gauge steel roofing R1@2.70 Sq 195.00 95.80 290.80
Add for gable studs
  2" x 4" spaced 16" OC (.54 BF per SF) B1@.023 SF .33 .77 1.10
Add for purlins (purling), Std & Btr, installed below roof rafters. Figures in parentheses indicate board feet per LF including 5% waste
  Using 2" x 8" joists at — MBF 598.00 — 598.00
  2" x 8" (1.40 BF per LF) B1@.023 LF .84 .77 1.61
Piecework, Rough Carpentry Rough carpentry on residential tracts is usually done by framing subcontractors who bid at piecework rates (such as per square foot of floor). The figures below list typical piecework rates for repetitive framing work and assume all materials are supplied to the framing subcontractor. No figures appear in the Craft@Hrs column because the work is done for a fixed price per square foot and the labor productivity can be expected to vary widely.
Layout and plating Piecework rates
Lay out wall plates according to the plans (snap chalk lines for wall plates, mark location for studs, windows, doors and framing details), cut top and bottom plates and install bottom plates. Costs per square foot of floor (excluding garage).
    Custom or more complex jobs — SF — .27 .27
    Larger job, longer runs — SF — .18 .18
Wall framing Piecework rates
Measure, cut, fit, assemble, and tip up walls, including studs, plates, cripples, let-in braces, trimmers and blocking. Costs per square foot of floor. [view picture]
    Complex job, radius walls, rake walls — SF — .74 .74
    Larger job, 8' high walls, fewer partitions — SF — .27 .27

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