essay 2-3 pages Cost & Estimating
Ssult89
Lecture11-WoodworkandCarpentry1.pdf
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CSMT 441
Woodwork and carpentry
Lecture 11
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Division 6: Woodwork
• Rough Carpentry
– wood framing (girders, beams, joists, columns, studs, rafters, …)
– sheathing (roof, wall, floor)
– prefabricated structural wood (roof trusses)
• Finish Carpentry
– soffits, paneling
• Architectural Woodwork
– cabinets, stairs and railings
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Lumber
• Lumber is wood that has been processed into beams and planks
• 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)
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Take off unit • Unit: feet-board measure, mfbm or just BF (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.
– For Example:
the board feet of 20 pcs of 2x8 lumber 14’ long is = 20 x 2
x 8 x 14 /12 = 373 fbm/BF
1’ 1’
1’’
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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
BCN 5618 6
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Floor framing
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Bridging
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Floor framing
• Review specs and dwgs for grade of lumber, size of girder, size and spacing of joists, no. and size of openings, no. and type of bridging, and type and thickness of subflooring
• # of joists= (bldg length/joist spacing)+1
• # of 4’x8’ subflooring plate = area of floor /32 (neglect openings less than 32 sf)
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Floor framing
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Joist dimensions
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Double trimmers and headers
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Exercise
