161 - Chapter 3 Wood Qualities of Wood Strong Stiff Light...

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1 Chapter 3 Wood Qualities of Wood Strong & Stiff Light Easily worked / shaped Fastened quickly & economically Recyclable Biodegradable Renewable Resource Undesirable Characteristics of Wood Not perfectly straight nor precise Size & shape affected by moisture Contains growth defects Can spilt & warp Burns easily Decays Susceptible to Insect Damage
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2 Tree Composition Bark Cambium Sapwood Heartwood Pith Tree Growth Springwood (earlywood) Î Faster growth Î Cells larger and less dense Summerwood (latewood) Î Slower growth Î Cells smaller and denser Types of Trees / Woods Oak Pine Poplar Oak Poplar Pine
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3 Construction Uses for Wood Structural Framing Subfloors and Roof Sheathing Siding - Structural & Exposed Finish cabinetry and Trim Lumber Production - Sawing Plain Sawing Î Maximum Yield Î Varying grain pattern Î Common use - Framing lumber Lumber Production - Sawing Quarter Sawing Î Perpendicular to annual rings Î Less yield, but consistent grain pattern Î Improved wearing quality, less distortion
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