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Curtis Borne Fort Valley State University

Course: 01.421 Agriculture Mechanics Technology Unit 1: Woodworking Lesson 4: Identifying Types and Grades of Lumber. Curtis Borne Fort Valley State University. Board Feet (FBM). 1. Board foot = L x T x W 12 Divide by 12 if length is in feet

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Curtis Borne Fort Valley State University

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  1. Course: 01.421 Agriculture Mechanics TechnologyUnit 1: WoodworkingLesson 4: Identifying Types and Grades of Lumber Curtis Borne Fort Valley State University

  2. Board Feet (FBM) • 1. Board foot = L x T x W • 12 • Divide by 12 if length is in feet • Divide by 144 if length is in inches

  3. 2. Materials used in farm construction • Three major kinds of materials used in farm construction: • Wood, steel & masonry

  4. 3. Classifications of lumber • Two Classifications of lumber: • Softwoods - pine, cedar, fir, redwood, cypress • Hardwoods - oak, ash, birch, cherry, sycamore, walnut, hickory, maple • Almost impossible to nail hardwoods & in knots in softwoods

  5. 4. Farm Buildings • Made of softwoods

  6. 5. Grades of softwoods • Two grades of softwood • Common • Select - knot free for finish work

  7. 6. Uses of common lumber • Common No. 1 & 2 used for rafters & joist • Common No. 3 used for studs & plates • Common No. 4 & 5 where strength is not a factor

  8. 7. Dressed lumber • A dressed 1” x 4” is actually • 25/32” x 3-5/8”

  9. 8. Lumber for specific jobs • concrete forms-pine,fir No. 1 & 2 • framing building-pine & fir No. 1,2,3 • roof sheeting-pine & fir No. 2 & 3 • siding-redwood & cedar • floors-pine & oak select lumber others above are common grades

  10. Fencing materials • When selecting fencing consider: • 1. type of livestock • 2. permanency

  11. Types of paint • 1. exterior 2. interior • 3. floor 4. roof • 5. enamel 6. barn • 7. masonry 8. metal or implement paint

  12. Rafter length formula • a squared + b squared = c squared • take square root of c squared • subtract half the thickness of ridge board • add length of overhang c b a

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