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37 Cards in this Set
- Front
- Back
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outermost protective layer.
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Bark (A dead B living)
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source of new wood cells
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Cambuim layer (C)
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Living cellss that store and transport nutrients
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Sapwood (D)
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Dead cells that contribute to structural strength
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Heartwood(E)
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innermost first years growth
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Pith F
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Results from differenrces in rate of tree growth and densityof cells, from spring to summer
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annual growth rings
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- from cone bearing (coniferous) trees
-relatively simple cell srtucure -generally plain figure |
Softwoods
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-from broadleafed (deicuous) trees
-more complex cell structure -often more interesting figure |
Hardwood
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only certifyings organization currently recognized for there LEED certification
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Forest Stewardship Council (FSC)
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growth rings roughly parralel to wider face of board.
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Plainsaw
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growth rings close to perpindicular to wider face of board
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quartersaw
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after lumber is sawn, it is ____, either in air or in kilns
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Seasoned
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Decay causing fungi cannot survive in wood with a moisture content below __
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20%
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As wood dries below approximately ____ it shrinks, mostly in cross section and only slightly in length
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30% MC
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Wood has both ___ and __ strength
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tensile and compressive
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Actual sizes of wood are less than _____
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nominal sizes
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In the US lumber is priced by the ___ , baosed on nominal not actual dominsions
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board foot
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laminated veneers
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plywood
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face veneers bounded to solid core
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composite panels
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glued, shredded strands like LSL
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Oriented strand board
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glued particles, smaller than OSB strands
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Particleboard
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glued, very fine-grainded wood particles
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Fiberboard
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Greater than 50% plastis, has both finish and structural applications>
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Plastic Lumber
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chemical salts pressure-impregnated into wood to reduce its combustibility
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Fire-retardent treated wood
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protect wood from decay and insect attack, (used when exposed to weather, contact with ground, or areas of high termite risk.
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Preservative treated wood
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Nails are sized in ___
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pennies
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Some screws require ____ some are self drilling
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pilot holes
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-light wood members (2x4, 2x6) joined with toothed plates
-long span capability. -rapidly erected on site using light duty cranes -congested attic space |
Trusses
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Can span further than solid lumber, using less raw material.
-top and bottom flanges of solid lumber, or composite material -webs of OSB or plywood |
I-Joists
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____ can act structurally, or be attached to a structural frame.
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Panel components
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built on towable chassis, to US HUD standards
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Manufactured homes (mobile homes)
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contructed to local building code requirements, but factory built and trucked to construction site.
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modular construction
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-broadrer grain pattern on wide face
greater distortion during drying more uneven surface erosion or wear more efficiently sawn from log, less costly aka flatsawn, flat grain |
Plainsawn lumber
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more narrowly spaced grain pattern on wide face
less distortion during drying more even surface erosion or wear more costly to saw from log aka edge sawn, edge grain, vertical grain |
Quartersawn lumber
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Lumber is ____ to make it smooth and more dimenionally precise
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surfaced
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EMC for exterior uses __
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15-19%
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EMC for interior uses ___
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5-11%
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