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BCN 5618. 2. Lumber. Lumber size categories: Boards1 to 1.5 in thick, 2 in and wider Dimension lumber2 to 4 in thick, 2 in and wider Timbers5 in and thicker, 5 in and widerNote: thickness is the smaller cross sectional dimension and width is the larger dimensionRough (2" x 4") vs dressed
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1. BCN 5618 1 Division 6 – Wood & Plastics Rough Carpentry
wood framing (girders, beams, joists, columns, studs, rafters, sills, …)
sheathing (roof, wall, floor)
prefabricated structural wood (roof trusses, I joists)
glued-laminated construction
Finish Carpentry
moldings, soffits, paneling, shelving
Architectural Woodwork
cabinets, stairs and railings, wood ornaments
2. BCN 5618 2 Lumber Lumber size categories:
Boards 1 to 1.5 in thick, 2 in and wider
Dimension lumber 2 to 4 in thick, 2 in and wider
Timbers 5 in and thicker, 5 in and wider
Note: thickness is the smaller cross sectional dimension and width is the larger dimension
Rough (2" x 4") vs dressed (1.5" x 3.5") lumber
In quantity takeoff use the rough or nominal dimensions (2 x 4)
3. BCN 5618 3 Takeoff Unit Unit: thousand feet-board measure, mfbm (note the type of species and grade of lumber)
One board foot is equal to the volume of a piece of wood 1 inch thick and 1 foot square.
the board feet of 20 pcs of 2x8 lumber 14’ long is = 20 x 2 x 8 x 14 /12 = 373 fbm
4. BCN 5618 4 Wood Framing Floor Framing
girders, sills, floor joists, joist headers, and subflooring
Wall Framing
plates, studs, headers, and wall sheathing
Ceiling Assembly
ceiling joists, headers, and trimmers for opening
Roof Assembly
rafters, headers and trimmers for opening, collar ties, ridge, lookouts, and roof sheathing
5. BCN 5618 5