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Flashcards in WOOD Deck (28):

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…



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


Plywood is particularly effective in resisting what kind of load

Lateral loads from wind or earthquake, in the form of roof and floor diaphragms and shear walls


How does interior and exterior plywood differ?

The type of adhesive used


What is A – D plywood?

It has an A grade face and a D grade back


Some structural plywood, such as for subflooring, is rated only with a…

Span rating ... The first number identifies its maximum spacing over roof rafters, the second number over floor joists


What is bead board and what is it used for?

An insulating board with a core of small expanded polystyrene beads with heavy paper laminated to both sides… Used as perimeter insulation on foundation walls


Three grades of glulam

Industrial, architectural and premium is the tops. All having to do with appearance


How are the individual laminations of glulam joined?

Scarf joint and finger joints


What is laminated decking?

Layers of lumber bonded with adhesive. The interior surface is intended to be exposed, available smooth grooved prefinished or stained.


What causes wood decay?

Fungi that thrive in mild temperatures, moisture, and air


What is an oil-borne chemical preservatives for wood? And what is a waterborne one?

Creosote (oil) and chromated zinc chloride (water)


Millwork refers to…

Shop fabricated items


What is the difference between common nails, box nails, and finish nails?

Common nails are used for most structural connection, box nails are thinner with less holding power, and finish nails are very thin just to attach finish what elements


First lightweight wood framed building

1833, Augustine Taylor's St. Mary's Church in Chicago