Wood Construction

1
Wood Construction

• CTC-375

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Wood

• Lumber
• Any wood cut into a size and shape used as a
  building material
• Timber lumber with smallest dimension gt5
• Board - lt2 thick, at least 2 wide
• Dimension - gt2 thick, lt5 thick, 2 wide
• Beam stringer - gt5 thick, 8 wide
• Post Beam lumber approximately square
• 5 thick and wide

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• Rough sawn lumber
• Sawn on all four sides to a nominal thickness and
  width
• Dressed lumber
• Sanded on 1 -4 sides
• Called by nominal size
• Sanding takes ¼ off per side
• Available in sizes from 8 16 feet
• Studs also available at 92 gives 8 ceiling
  height

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• Types of wood construction
• Post Beam
• Wooden frame provides structural support
• No interior bearing walls
• Posts must be attached to foundation
• Balloon Framing F 13-4
• Exterior walls are continuous from foundation to
  roof
• Floors are attached to the walls
• Revived in 1980s as solar power gained
  popularity
• Need to place fire breaks in the walls

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• Platform Framing F 13-3
• Walls rest on floors
• Floor is built to edge of foundation then
  sheathed
• Wall is built on top of floor
• Walls have single bottom plate and double top
  plate for strength
• Fire blocks at every floor

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• Panels or module construction
• Structural Insulated Panels (SIP)
• Can be walls or roof systems
• Conventional floor system but walls are
  constructed off site in 4x8 panels and hauled to
  site
• Allows for windows, doors to be installed at same
  time as walls
• Must have a flat surface

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Construction

• Hurricane clips for roof
• Anchor bolts and tie downs for foundation-frame
  connections
• Blocking
• Where do you place blocking?
• Joist Bridging
• Makes floor into a system

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Floor Systems

• Conventional 2x construction
• Box beam surrounds joists
• Girders are built up from 2x stock
• Joists are 2x stock 16 o.c.
• ¾ sheathing is glued and screwed onto joists
• Can use 5/8 sheathing but total floor must
  1.25
• Engineered Lumber
• I-joists 2x3 top bottoms with OSB web
• Long and strong
• Can span 40 60 feet eliminates interior
  bearing walls

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• Floor Trusses
• Usually used in commercial buildings
• Provide long spans
• Holes in Joists
• Holes only in center of joist (neutral axis) and
  only within 1/3 of span of end
• Diameter not more than 1/3 of height or be closer
  than 2 from an edge

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Roof Trusses

• Components
• F 13-12
• Truss types F 13-13
• Erection F 13-14
• Bracing F 13-15

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Timber Construction

• F 13-24
• Post and beam on a larger scale
• Connections F 13-25