Building Systems

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Author:
janelle596
ID:
105323
Filename:
Building Systems
Updated:
2011-09-29 22:10:19
Tags:
Wood Material Types
Folders:

Description:
Building Systems
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  1. Wood Classes
    • Softwood, predominatly evergreens, cone-bearing trees, pines, firs, hemlocks
    • Hardwood, broad-leaf, flowering trees, cherry, maple, oak
  2. Wood composition
    • Non-homogeneous organic material
    • High shrinkage and swelling across grain
    • Low shrinkage and swelling along grain
  3. Plain Sawn
    Cut similar to meat, parallel layers, least expensive, tends to twist and cup, varied grain
  4. Quarter Sawn
    Wood is cut at right angles, most expensive, uniform grain
  5. Wood Defects
    • Knots – hard nodes of branches
    • Checks – splits across the annual rings
    • Shanks – splits between annual rings
    • Pitch pockets – well-defined openings between annual rings containing solid or liquid pitch
    • Wane – presence of bark or absence of wood along edge
    • Cupping – curvature across face
    • Crook (Crown) – curvature along edge
    • Bow – curvature along length
    • Twist – edges turning in opposite direction
  6. Wood Attributes
  7. Lumber
    • Board - less than 2" thick and more than 2" wide (siding, interior trim)
    • Dimensional lumber - 2"-4" thick and more than 2" wide
    • Timber - 5" and more in the least direction (beams, posts)

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