Deck 14: Materials for Wood Construction-Ii Engineered Wood Products, Fasteners, and Connectors

Question 1

Grade stamps on engineered wood panels specify

A)intended use and exposure.
B)allowable spans.
C)thickness.
D)mill number.
E)all of the above.

Answer 1

E

Question 2

Compared to sawn lumber joists, wood I- joists are

A)slightly heavier.
B)less expensive.
C)dimensionally more stable.
D)all of the above.

Answer 2

C

Question 3

Plywood panels are made by gluing, under heat and pressure, layers of

A)wood veneers so that the wood grains in adjacent layers are perpendicular to each other.
B)shredded wood strands so that the strands in adjacent layers are perpendicular to each other.
C)shredded wood strands so that the strands in all layers are in the same direction.
D)wood veneers so that the wood grain in all layers is in the same direction.

Answer 3

A

Question 4

Characteristics of a truss include

A)greater spanning capability than a sawn lumber beam having the same amount of material.
B)individual members joined together to form an array of interconnected rectangular frames.
C)individual members joined together to form an array of interconnected triangular frames.
D)A and B.
E)A and C.

Question 5

Laminated veneer lumber (LVL)is

A)generally used as floor joists and beams.
B)stronger along the grain and weaker across the grain.
C)glued with all veneers running in the same direction.
D)produced by gluing together wood veneers that are approximately 1/8 in. thick.
E)all of the above.

Question 6

Unbalanced beams can be used only as single- span beams.

Question 7

Nail plates, used to join members of a truss, are generally used only on one face of the truss.

Question 8

A glulam member

A)is generally stronger and stiffer than sawn lumber of the same dimensions.
B)must be made using long, continuous lengths of high- grade sawn lumber.
C)requires complete protection from exterior elements due to its water- soluble adhesive.
D)none of the above.
E)all of the above.

Question 9

Unprotected glulam members with a large cross section are considered to provide a fire resistance rating of up to

A)1/2 h.
B)1 h.
C)2 h.
D)3 h.
E)4 h.

Question 10

Cross- graining makes a plywood panel

A)less likely to split than solid sawn lumber.
B)stronger in the direction of face veneer grains.
C)dimensionally more stable.
D)all of the above.
E)A and C only.

Question 11

Several different types of nails are used in wood frame construction. They are typically distinguished from each other by the

A)nail head and nail tip.
B)nail head and nail shank.
C)nail tip and nail shank.
D)nail head and type of threads.
E)none of the above.

Question 12

Wood trusses are generally spaced at

A)24 in. on center.
B)60 in. on center.
C)48 in. on center.
D)12 in. on center.

Question 13

The most common use of glulam members is in

A)structural panels.
B)short- span beams.
C)long- span beams.
D)none of the above.

Question 14

The most commonly used plywood panel (nominal)size is 4 ft × 8 ft.

Question 15

Balanced glulam beams are mandated for

A)beams with an overhang.
B)single- span beams.
C)continuous beams.
D)A and C.
E)B and C.

Question 16

An OSB panel generally has greater shear strength than a plywood panel of the same size and thickness.

Question 17

Plywood panels should be placed with their longer dimension

A)diagonal to rafters or joists.
B)perpendicular to rafters or joists.
C)parallel to rafters or joists.
D)either A or B.
E)either A or C.

Question 18

Exterior siding panels may be made of OSB or plywood.

Question 19

Wood I- joists are made of LVL or solid sawn lumber flanges and webs.

Question 20

With respect to veneer quality, softwood plywood is graded in grades

A)B to F.
B)A to C.
C)B to D.
D)A to D.
E)A to E.

Question 21

Name at least four engineered wood products.

Question 22

Nail popping is primarily a problem in floor sheathing and is caused by the shrinkage of floor sheathing.

Question 23

The depth of a glulam beam (vertical dimension)is generally a multiple of a certain dimension. What is that dimension?

Question 24

The adhesives used in making engineered wood products contain

A)urethane.
B)styrene.
C)lignin.
D)formaldehyde.
E)none of the above.

Question 25

Gaseous emissions produced by engineered wood products decrease over time.

Question 26

The nails most commonly used in wood frame construction are

A)6d, 10d, 16d, and 20d.
B)6d, 8d, 10d, and 12d.
C)4d, 6d, 9d, and 12d.
D)6d, 8d, 10d, and 16d.
E)6d, 12d, 18d, and 24d.

Question 27

An unbalanced glulam beam can only be used as a single- span beam, while a balanced glulam beam can be used in all situations. Why then, are unbalanced glulam beams made?

Question 28

What does the acronym LVL stand for?

Question 29

Laminated veneer lumber (LVL)and plywood members are both made by gluing together approximately
1/8- in.- thick wood veneers. What is the difference between the two members in how the wood grain in veneers is oriented?

Question 30

What is a balanced glulam beam?

Question 31

Explain what a laminated veneer lumber (LVL)member is and what it is typically used for.

Question 32

Nails work best when they are subjected to

A)shear.
B)tension.

Question 33

Glulam members are generally made using 2- by (1- 1/2 - in.- thick)lumber members, but in some situations we use 1- by (3/4- in.- thick)lumber members. Which are these situations?

Question 34

Which of the following nailed connections is the strongest?

A)Toe nailing
B)Face nailing
C)End nailing

Question 35

Joist hangers are steel connectors

A)that connect floor joists with the supporting wall.
B)that connect floor joists with a supporting beam.
C)that connect floor joists with floor sheathing.
D)all of the above.

Question 36

Which structural properties of a glulam beam are included in its grade stamp?

Question 37

Would you consider the use of a balanced glulam beam or an unbalanced glulam beam that has an overhang?

Question 38

What is the most common use for glulam members?

Question 39

What is the approximate moisture content in lumber laminations in glulam members?

Question 40

What are the top and bottom horizontal parts and the vertical part of an I- section called?

Question 41

Explain why OSB panels cannot be treated with preservative or fire- retardant chemicals while plywood can be.

Question 42

What is the difference between sheathing and siding?

Question 43

What is the difference between the terms "floor sheathing" and "subfloor"?

Question 44

What are the members that connect the top chord of a truss with its bottom chord called?

Question 45

The structural wood panels (plywood and OSB)are graded for durability with respect to weather exposure in two classifications. State the classifications and the differences between them.

Question 46

Straight- edged (without tongue- and- groove)structural wood panels (plywood and oriented strandboard, OSB)are typically made to nominal dimensions of 4 ft × 8 ft. What are the actual dimensions of such a panel?

Question 47

Wood trusses can be used to frame a floor or a roof. Which of these two is referred to as a parallel- chord truss?

Question 48

What are wood I- joists typically used for in a wood frame structure?

Question 49

In specifying a wood roof truss for a project, its slope, overall geometry, and the loads imposed on it are determined by the architect in consultation with the structural engineer. The structural design of the truss is, however, not done by the project's structural engineer. Who, then, prepares the structural design of the truss, and what is the role of the architect and the project's structural engineer after the truss design has been completed?

Question 50

What is the most commonly used lumber size in making floor trusses, and what is the width of such a truss?

Question 51

Square- edged floor sheathing requires an additional panel over it, which is typically a 1/4- in.- thick sanded plywood or hardboard, to make it a two- layer (combination)floor sheathing. Why is (additional)panel overlayment required?

Question 52

In a wood I- joist, what are the flanges typically constructed of and what is the web constructed of?

Question 53

In a plywood panel, the grain direction in adjacent veneers is at right angles to each other, referred to as
cross- graining of veneers. Cross- graining equalizes the panel strength in the two principal directions of the panel. Does it mean that a plywood panel (typical size is 4 ft × 8 ft)is equal in strength in its long and short directions?

Question 54

Of the two structural panels (plywood and OSB), which is more commonly used for wall sheathing, floor sheathing, and roof sheathing and why?

Question 55

The floor sheathing in a wood frame structure can be a two- layer sheathing or a one- layer sheathing. What is the difference between the two?

Question 56

OSB panels are made from paper- thin wood wafers. How, then, are OSB panels (like the plywood panels)stronger in their longer direction as compared to the shorter direction?

Question 57

Plywood, oriented strandboard (OSB), and particle board are three most commonly used wood- based panels in building construction. Which of these is (are)used in structural applications and which in nonstructural applications?

Question 58

Which of the following materials (sawn lumber, I- joists, or laminated veneer lumber)is used to make a wood floor truss?

Question 59

Which of the two durability grades (Exterior and Exposure 1)are not available in OSB panels and why?

Question 60

I- joists can be used in place of sawn lumber joists in the construction of a wood floor. Which of the two (lumber joists or I- joists)yields a lighter floor?

Question 61

With the help of a three- dimensional sketch, explain the connection of a floor joist with a supporting beam using a joist hanger.

Question 62

Using sketches and notes, explain the composition of a wood I- joist. What are the advantages and disadvantages of wood I- joists compared with solid lumber?

Question 63

The adhesives used in engineered wood are formaldehyde- based-either phenol formaldehyde- based or urea formaldehyde- based. Which of the two adhesives is used in plywood and which in OSB panels, and why?

Question 64

Which type of nail is commonly used for connections between framing members in wood light- frame structures? How do we specify the size of nails?

Question 65

With the help of an example, explain what type of information is provided in the grade stamp of a typical performance- rated engineered wood panel.

Question 66

Give the sizes (in inches and penny designation)of commonly used nails in wood frame construction.

Question 67

Using a sketch, explain the difference between a roof truss and a floor truss. In which situations will you consider the use of wood floor trusses?

Question 68

Using sketches and notes, explain the difference between a balanced and an unbalanced glulam beam and the situations in which they are specified.

Question 69

Using a sketch and notes, explain the following terms related to a wood roof truss: (a)top chord, (b)bottom chord, (c)web member, (d)panel point, and (e)nail plate.

Question 70

Discuss the relative advantages and disadvantages of OSB and plywood panels.

Question 71

Using sketches, illustrate the following connections in wood frame members: (a)face- nailed connection, (b)end- nailed connection, and (c)toe- nailed connection.