Ch. 39 Structural and Rough Carpentry

Question 1

What type of carpentry includes the structural framing sheathing blocking and pieces necessary to prepare the building for finish work?

Answer 1

Rough Carpentry

Question 2

Timber is lumber with a ____ minimum sectional dimension?

Answer 2

5in

Question 3

What type of trees do SOFT woods come from?

Answer 3

Conifers

Question 4

What type of trees do HARD woods come from?

Answer 4

Deciduous Trees

Question 5

What direction does wood handle tensile stress better in. Perpendicular or Parallel?

Answer 5

Perpendicular

Question 6

Wood is weakest when what type of force is applied to it?

Answer 6

Horizontal Shear Force

Question 7

Name the 6 defects that can be found in wood?

Answer 7

Knots, Checks, Pitch Pockets, Shakes, Splits, and Wanes.

Question 8

What is a check?

Answer 8

A check is a separation of the wood fibers occurring across or through the annual growth rings.

Question 9

What is a pitch pocket?

Answer 9

A pitch pocket is an open area between growth rings

Question 10

What is a split?

Answer 10

A split is similar to a check, but extends completely through. Generally occurs at the ends

Question 11

What is a wane?

Answer 11

The presence of bark, or the absence of wood from any cause on the edge or corner of a piece of lumber.

Question 12

What are the two primary classifications of softwood lumber?

Answer 12

Yard lumber-used for structural and rough opening

Factory and Shop Lumber- used for making doors, frames, windows, and finish items

Question 13

How is lumber priced?

Answer 13

by the board foot.

Question 14

What is a board foot?

Answer 14

A nominal 1’x1’x1” piece of wood with actual dimensions being, 11.25”x11.25”x.75”

Question 15

At what moisture percentage is wood considered dimensionally stable, but when it dries it will shrink substantially?

Answer 15

30%

Question 16

What percentage does the moisture level in wood have to fall below to be considered dry lumber?

Answer 16

19%

Question 17

What percentage does the moisture level in wood have to fall below to be considered kiln dry lumber?

Answer 17

15%

Question 18

What are the two types of structural plywood?

Answer 18

Types 1 and 2

Question 19

What are the classification of veneer grade plywood?

Answer 19

N -intended for natural finish and is made from all heartwood and sapwood
A -is smooth and paintable
B -allows for plugged not holes, but has smooth surface
C -allows for small knotholes and small splits
D -allows for even larger notholes

Question 20

T/F, OSB is more susceptible to delimitation than plywood.

Answer 20

True, if used for exterior sheathing it must be under short term exposure to weather, and the glue must be waterproof

Question 21

What is bridging?

Answer 21

It is the method of bracing between joists to prevent buckling

Question 22

what is a S.I.P.

Answer 22

A SIP is a Structural Insulated Panel, it is prefabricated and considered a green building element

Question 23

What are the standard manufactured dimensions of glulam?

Answer 23

3 1/8”, 5 1/8”, 6 3/4”, 8 3/4”, 10 3/4” 12 1/4”

Question 24

What are the three appearance grade types for glulam beams?

Answer 24

Industrial, architectural, and premium

Question 25

For heavy wood frame construction what are the two special timber connectors used?

Answer 25

Split rings, and shear plates

Question 26

What is Creosote?

Answer 26

Creosote is a wood treatment that protects against insects, and is typically found in outdoor application like railroad ties, and marine timbers

Question 27

What is Pentachlorophenol?

Answer 27

A preservative used to treat utility poles and bridge timbers, sometimes it is used on glulam beams in exterior applications

Question 28

What is copper quat? (ACQ)

Answer 28

A water based clean odorless and nonstaining wood protectant , great for building applications. However ACQ is very corrosive with certain types of fasteners.

Question 29

What is sodium borate? (SBX)

Answer 29

A water based clean odorless and nonstaining wood protectant , great for building applications.

Question 30

What two wood treatments were being phased out by 2003 by the EPA and why?

Answer 30

Chromated copper arsenate (CCA) and Ammoniacal copper zinc arsenate (ACZA). Because of their arsenic content

Question 31

T/F When cuts are made to treated wood, the exposed area should be treated with a copper naphthenate solution containing at least 2% copper.

Answer 31

True

Question 32

Where is the greatest shrinkage in wood?

Answer 32

Radial Shrinkage

Question 33

T/F The stands of OSB are oriented in the same manner in each layer as the grain of the veneer.

Answer 33

True

Question 34

T/F The stands of Plywood are oriented in the same manner in each layer.

Answer 34

False, The stands of Plywood are perpendicular to the layer before it

Question 35

On rated sheathing what does the number 32/16 mean?

Answer 35

It means it can be used as roof sheathing on top of roof joists up to 32” OC and 16” OC for floor joists

Question 36

T/F THe long dimension of a sheet of sheathing must be placed perpendicular to the length of the support member.

Answer 36

True

Question 37

What are the three exposure durability classifications?

Answer 37

Exterior- suitable to be permanently exposed
Exposure 1- Glued with Waterproof glue, can be structural
Exposure 2 - Suitable for panels that will be fully protected from weather

Question 38

What types of nails should be used with western red cedar?

Answer 38

Hot dipped galvanized, aluminum, and stainless steel. All others will corrode