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Flashcards in Plywood Deck (30)
1

plywood: graded two ways

span rating,
quality of face veneer.

2

plywood: graded for structural applications.

span rating

3

span rating consists of 2 #’s

max spacing for roof supports,
then max spacing for floor supports.

4

span rating req's

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

5

span rating for structural use, also classified by

species of wood (5 groups)

6

Span rating:
Structural I uses which wood groups:

only group 1

7

Span rating:
Structural II uses which wood groups:

groups 1,2,3

8

quality of face veneer: N

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

9

quality of face veneer: A

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

10

quality of face veneer: B

allows for plugged knotholes,
but has smooth surface.

11

quality of face veneer: C

allows small knotholes and some splits.

12

quality of face veneer: D

larger knotholes.

13

if plywood to be outdoors:

should have special glue spec'd

14

plywood is available in these special panels:

patterned panels,
marine plywood,
smooth paper surface.

15

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

sheathing

16

sheathing typ material:

plywood/particleboard

17

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

insulated sheathing

18

mixed in binder and formed under pressure:

particleboard

19

particleboard available in varying:

densities

20

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

bc less $/more dimensionally stable than plywood.

21

engineered panel product,
manufactured from precision-cut wood strands

OSB

oriented strand board

22

OSB strand dims:
arranged in:

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

23

OSB sizes

from 4x8’ to 8x28’

24

primary OSB strength is noted visually by:

orientation of chips on the face layer,

typ parallel to length of panel.

25

OSB disadvantage:

more susceptible to delamination than plywood.

26

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

medium-density fiberboard (MDF)

27

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

medium-density fiberboard (MDF)

28

*most dimensionally stable of mat-formed panel products.

medium-density fiberboard (MDF)

29

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

hardboard

30

process to make hardboard harder, stiffer, heavier:

temper