Plywood

Question 1

plywood: graded two ways

Answer 1

span rating,

quality of face veneer.

Question 2

plywood: graded for structural applications.

Answer 2

span rating

Question 3

span rating consists of 2 #’s

Answer 3

max spacing for roof supports,

then max spacing for floor supports.

Question 4

span rating req’s

Answer 4

face grain perpendicular to supports, and continuous over 3 supports.

Question 5

span rating for structural use, also classified by

Answer 5

species of wood (5 groups)

Question 6

Span rating:

Structural I uses which wood groups:

Answer 6

only group 1

Question 7

Span rating:

Structural II uses which wood groups:

Answer 7

groups 1,2,3

Question 8

quality of face veneer: N

Answer 8

natural finish,
made from all heartwood/sapwood.
free from defects,
but only special order.

Question 9

quality of face veneer: A

Answer 9

smooth + paintable,
few knots/defects,
best commonly available.

Question 10

quality of face veneer: B

Answer 10

allows for plugged knotholes,

but has smooth surface.

Question 11

quality of face veneer: C

Answer 11

allows small knotholes and some splits.

Question 12

quality of face veneer: D

Answer 12

larger knotholes.

Question 13

if plywood to be outdoors:

Answer 13

should have special glue spec’d

Question 14

plywood is available in these special panels:

Answer 14

patterned panels,
marine plywood,
smooth paper surface.

Question 15

lateral support, increase rigidity, base for ext. finishes.

Answer 15

sheathing

Question 16

sheathing typ material:

Answer 16

plywood/particleboard

Question 17

where lateral stability not critical, this sheathing mat’l may be used:

Answer 17

insulated sheathing

Question 18

mixed in binder and formed under pressure:

Answer 18

particleboard

Question 19

particleboard available in varying:

Answer 19

densities

Question 20

particleboard typ. prefered for backing/framing of finish carpentry/woodwork bc:

Answer 20

bc less $/more dimensionally stable than plywood.

Question 21

engineered panel product,

manufactured from precision-cut wood strands

Answer 21

OSB

oriented strand board

Question 22

OSB strand dims:

arranged in:

Answer 22

max 4” long,
0.0027” thick.
arranged in layers @ right angles,

Question 23

OSB sizes

Answer 23

from 4x8’ to 8x28’

Question 24

primary OSB strength is noted visually by:

Answer 24

orientation of chips on the face layer,

typ parallel to length of panel.

Question 25

OSB disadvantage:

Answer 25

more susceptible to delamination than plywood.

Question 26

wood particles,
reduced to fibers in moderate steam pressure vessel,
combined w a resin,
bonded under heat and pressure.

Answer 26

medium-density fiberboard (MDF)

Question 27

quality: smooth, uniform, dense surface.
uses: painting, veneers, high-pressure laminates.

Answer 27

medium-density fiberboard (MDF)

Question 28

*most dimensionally stable of mat-formed panel products.

Answer 28

medium-density fiberboard (MDF)

Question 29

inter-felted fibers,
consolidated under heat + pressure,
to a density of 31 lb/ft3.

Answer 29

hardboard

Question 30

process to make hardboard harder, stiffer, heavier:

Answer 30

temper