WOOD Flashcards
What is the difference between wood, lumber, and timber?
Wood: the hard fibrous substance lying beneath the bark of trees
Lumber: wood sawn into construction members
Timber: lumbar 5 inches or larger in it’s least dimension
What does it mean to season wood?
To dry it out for you some construction… By air drying which takes several months and leaves 10 to 20% moisture in the lumber… or kiln drying which takes only a few days and leaves less than 10% moisture
In addition to less shrinkage, seasoned wood is better in these other ways than green wood
Stronger, left a bore thing, more fungi resistant, more decay resistant, more insect resistant, greater nail holding power, greater ability to hold paint
Three ways to quarter saw
Alternate, common, radial
Characteristics of plainsawed versus quartersawed lumber
Plainsawed: distinct grain pattern, susceptibility to twisting cupping and wearing unevenly, raised grain, shrinks and swells more in with, lesson thickness, left waste in cutting
Quartersawed: even grain pattern, less warpage, shrinks and swells morning sickness, lesson with, more waste in cutting, more costly
What is the difference between a peck and a pitch pocket?
A peck is a pitted area sometimes found in Cedar in Cyprus
a pitch pocket is an opening between growth rings containing resin
What is the difference between a shake and a check?
A check is a lengthwise green separation caused by seasoning… A shake is also a lengthwise green separation, between or through growth rings, but it is a natural defect
What is a split?
A manufacturing defect, a lengthwise separation of wood extending from one face to the other
If it is less than 2 inches thick it is a…
Board!
If it is 2 inches to 5 inches it is a…
Dimension lumber
What is yard lumber?
Used in general construction
What is factory and shop lumber?
Used for remanufacture into products… Like sashes and doors
How is selected would classed? And how is common lumber class?
Selective class from eight to D, common lumber is classed 1 to 5 in descending order to more and more blemishes
What is the difference between rough, dressed, and worked lumber?
Rough has visible saw marks, dressed is planed smooth in uniform sizes, and worked lumber is dressed and then tongue and groove, shiplapped or shaped in some pattern
What are all the plies called in plywood?
The face and the back on the outside, the core is the innermost, and the additional sheets are called crossbands
