WOOD Flashcards
joists in wood-framed building (5)
- nominal width 2in
- nominal depths 6-14in
- joist may have nominal width of 3-4in for heavy loads
- double joists must be provided under partitions parallel to joists
- spaced at 12in or 16in on center
wood split
separation that extends complete through a piece of lumber - would most affect the wood joist’s ability to resist horizontal shear
wood I-joists
engineered product to be used in place of traditional wood joists for spans from 16-20ft - typically has OSB web
glue-laminated members
Joining of smaller strips of wood together with glue - can be laminated into shapes not found in nature - smaller in size than solid timbers of equal load carrying capacity
saddle hangers
pieces of preformed metal that help minimize the space required for wood framing by allowing the joists to be installed with their top edges flush with the top edges of the beams
flitch beam
combines wood and steel into one member with load-carrying capacity
moisture content
weight of water in wood as a fraction of the wight of oven-dry wood - less moisture content = higher structural quality
platform vs balloon framing
platform framing uses separate studs for each floor of the building with the top plates, floor jooists, and floor framing
balloon framing uses continuous wall studs from foundation to second floor ceiling
plywood
sheets of thin veneer glued together
sheathing
thin panel material attached to framing - lateral support, increase rigidity, and provide base for finishes
particleboard
composed of small wood particles, fibers or chips mixed together - preferred for backing and framing of finish carpentry
oriented strand board (osb)
engineered panel product manufactured from precision-cut wood - arranged in layers - not expensive, not strong
medium-density fiberboard (mdf)
panel product made from wood particles reduced to fibers - most dimensionally stable - smooth, uniform, dense surface
firestops
barriers installed in concealed spaces of combustible construction to prevent the spread of fire caused by drafts
structural insulated panels (sip)
composite building unit consisting of two oter skins bonded to an inner core of rigid insulation material
cross-laminated timer (clt)
wood product manufactured by layering dimension lumber at right angles to form a thick structural panel - odd number of layers- resist axial, bending,a nd racking loads - made into large panels for floors, roofs, walls
plain sawing
most efficient use of the log - least expensive - various orientations to the grain of the tree
quarter sawing
cutting log into quarters and then sawing perpendicular to a diameter line - more uniformly vertical grain - boards tiwst and cup less, shrink less in width, hold paint better, have fewer defects
rift sawing
consistent vertical grain - saw cuts from the quartered log are made radially to the center of tree - more waste = more expensive
veneer cuts
rotary (least expensive), plain slicing, quarter slicing, half round, rift
cabinet door front construction (4)
flush, flush overlay, reveal overlay, lipped overlay
scribe piece
oversized piece of plastic laminate or wood that can be trimmed in the field to follow the irregularities of the wall
venner matching (3)
bookmatching, slip matching, random matching
panel matching venners
warehause match, sequence match,blueprint match
direction wood will shrink most
tangentially
parallel strand lumber (psl)
strongest manufactured wood product
wood panel is rated as fraction
top number is roof rafter spacing and bottow number is floor joist spacing
flat head nails
common nails, sinker nail, box nail, roofing nail
types of nailed connections
face nail (strongest- perpendicular to grain), end nail (weakest-parallel to grain), toe nail
stressed-skin
3 layers (sheathing, studs, sheathing) - studs take up compression loads, sheathing takes up tension loads
ways to fram a corner in stud framing
corner framing, california corner, interior corner, double stud
stringers
support stairs
Four types of seasoning distortions in dimension lumber
Crook
Bow
Cup
Twist
