Structural Lumber

Question 1

includes structural framing, sheathing, blocking

Answer 1

rough framing

Question 2

product of sawing, planing, preparing wood for use as construction members.

Answer 2

Lumber

Question 3

lumber w min 5in sectional dimension

Answer 3

timber

Question 4

lumber advantages:

Answer 4

plentiful,
low cost,
easy to shape/assemble,
good thermal insulating qualities.

Question 5

lumber disadvantages:

Answer 5

lacks uniform appearance that manufactured materials have.

Question 6

cellular structure of wood brings this problem

Answer 6

dimensional changes when moisture content changes

Question 7

softwood denotes:

Answer 7

coniferous tree

Question 8

hardwood denotes:

Answer 8

deciduous tree

Question 9

used for finish carpentry

Answer 9

hardwood + softwood

Question 10

used for rough carpentry

Answer 10

softwood

Question 11

southern pine is used for rough carpentry in:

Answer 11

southeastern USA

Question 12

douglas fir is used for rough carpentry in :

Answer 12

western region

Question 13

common lumber types for rough carpentry:

Answer 13

hem-fir,
eastern white pine,
hemlock.

Question 14

redwood + cedar are used when:

Answer 14

@ exterior when moisture resistance req’d.

Question 15

lumber strength is dependent on:

Answer 15

load direction vs.

grain direction.

Question 16

Lumber load/grain strength:

strongest combination

Answer 16

compression, load parallel to grain.

Question 17

Lumber load/grain strength:

slightly less strong

Answer 17

tension, load parallel to grain.

Question 18

Lumber load/grain strength:

Least strong

Answer 18

compression, load perpendicular to grain.

Question 19

Lumber load/grain strength:

weakest

Answer 19

horizontal shear force introduced.