Wood Materials and Construction

From Quiz 6

Wood is considered a "sustainable" design material partially because it is the only major structural material that is renewable AND wood has significantly lower embodied energy/carbon content than other structural materials 

(True False)

True

Typical faults found in wood used for framing include: checks, warps, twists, bows, cupping and splits.

(True or False)

True

Which of the following two terms are used synonymously?

Lumber and solid sawn lumber.

Lumber and wood.

Lumber and laminated veneer lumber.

All of these

Lumber and solid sawn lumber

The cellular structure of wood consists mainly of

hollow, long tubular cells.

If we cut a cross section through a tree trunk, we will see a number of rings. The most appropriate term for these rings is

growth rings.

The walls of wood cells consist primarily of

cellulose.

The terms sapwood and heartwood refer to:

two different subspecies of wood.

two different parts of the same tree.

two different wood species.

two different types of wood cells.

two different parts of a growth ring.

two different parts of the same tree.

The difference between softwoods and hardwoods is based on the

botanical characteristics.

Which of the following species of wood is not a softwood?

Cedar

Oak

Pine

Redwood

Fir

Oak

Which of the following species of wood is not a hardwood?

Balsa wood.

Oak.

Teak.

Redwood.

Rosewood

Redwood

Spruce is a softwood species

(True or False)

True

Lumber used for structural framing of buildings in North America is generally derived from

from softwood species.

Hardwoods are generally used for fine-quality flooring, furniture, and wall paneling.

(True or False)

True

In the United States, most structural lumber is grown in the

western and southern regions of the United States.

Redwood is grown mainly in

Florida. Oklahoma. Arizona. Texas. California.

California

Which of the following species of wood is naturally decay resistant? Hemlock. Cedar. Fir. Spruce. Pine

Cedar

In a 2 × 6 stud the wood grain is parallel to the

vertical direction.

Wood is

equally strong in both directions of the grain. stronger along the grain than across the grain. stronger across the grain than along the grain.

stronger along the grain than across the grain.

Flat-sawn lumber is dimensionally more stable than quarter-sawn lumber

(True or False)

False

The actual dimensions of 4 × 8 lumber are

3-1/4 in. × 7-1/4 in.

3-1/2 in. × 7-1/4 in.

3-1/4 in. × 7-1/2 in.

None of these.

3-1/2 in. × 7-1/2 in.

3-1/2 in. × 7-1/4 in.

The actual dimensions of 2 × 12 lumber are

1.5 inches by 11.25 inches

The basis for distinguishing lumber as board,dimension lumber, and timber is the

cross-sectional dimensions of lumber.

Preservative-treated lumber is effective

against both fungi and termites.

The most common use of glulam members is in

long-span beams.

A glulam member

requires complete protection from exterior elements due to its water-soluble adhesive.

is generally stronger and stiffer than sawn lumber of the same dimensions.

None of these.

must be made using long,continuous lengths of high-grade sawn lumber.

All of these.

is generally stronger and stiffer than sawn lumber of the same dimensions.

Laminated veneer lumber (LVL) is

stronger along the grain and weaker across the grain.

All of these.

generally used as floor joists and beams.

glued with all veneers running in the same direction.

produced by gluing together wood veneers that are approximately 1/8 in. thick.

All of these.

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

(True or False)

True

Compared to sawn lumber joists, wood I-joists are

dimensionally more stable.

Characteristics of a truss include

individual members joined together to form an array of interconnected triangular frames.

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

wood veneers so that the wood grains in adjacent layers are perpendicular to each other.

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

(True or False)

True

Plywood panels should be placed with their longer dimension

either parallel to rafters or joists or perpendicular to rafters or joists.

either parallel to rafters or joists or diagonal to rafters or joists.

perpendicular to rafters or joists.

parallel to rafters or joists.

diagonal to rafters or joists.

perpendicular to rafters or joists.

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

(True or False)

True

Grade stamps on engineered wood panels specify

allowable spans.

intended use and exposure.

All of these.

thickness.

mill number.

All of these.

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

nail head and nail shank.

Nails work best when they are subjected to

tension OR shear

shear.

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

(True or False)

True

Joist hangers are steel connectors

that connect floor joists with a supporting beam.

Roughly how old is WLF construction?

200 years

In the early version of WLF construction the studs were continuous from the foundation to the roof 

(True or False)

True

In time the early version of WLF construction was modified to what is now called a

platform frame.

The framing members in a WLF building are generally

2-by solid lumber members.

The center-to-center spacing of framing members in a WLF building is mainly based on

structural considerations and the size of sheathing panels.

The top plate in a WLF wall generally consists of

two 2-by members.

three 2-by members.

one 2-by member.

None of these.

Any one of these, depending on architectural considerations.

two 2-by members.

The bottom plate in a WLF wall is called

either a sill plate or a sole plate, depending on the location of the wall.

A sill plate in a WLF wall must be anchored to the foundation with at least

None of these.

3/4-in.-diameter bolts spaced a maximum of 6 ft on centers.

1/4-in.-diameter bolts spaced a maximum of 6 ft on centers.

1/2-in.-diameter bolts spaced a maximum of 6 ft on centers.

1-in.-diameter bolts spaced a maximum of 6 ft on centers.

1/2-in.-diameter bolts spaced a maximum of 6 ft on centers.

A corner made by two WLF walls must have at least

three studs.

A jack stud is always accompanied by a king stud (True or False)

True

In a WLF wall assembly a cripple stud is used

above a header or below rough sill.

A header over an opening bears directly on

jack studs.

A precut stud length equal to 7 ft 8-5/8 in. is commonly used because

it provides a floor-to-ceiling height of 8 ft.

The header over an opening in a wall made of 2 × 6 studs consists of

two 2-by lumber members nailed together with two intervening fillers.

two 2-by lumber members nailed together with three intervening fillers.

three 2-by lumber members nailed together. three 2-by lumber members nailed together with two intervening fillers.

three 2-by lumber members nailed together with one intervening filler.

three 2-by lumber members nailed together with two intervening fillers.

In a WLF building a floor framing plan indicates

the layout of floor joists, floor beams, and blocking.

A non-load-bearing wall in a building is one that supports the loads from the roof but not from any floor

(True or False)

False

The primary purpose of full-depth blocking in a floor frame is to

prevent buckling of floor joists.

Blocking between floor joists is required where

both the joists bear on a wall and the joists bear on a beam.

A roof with gable ends on both sides in a rectangular building has

no eaves.

eaves on all four sides.

eave on one side.

eaves on three sides 

eaves on two sides.

eaves on two sides.

A rectangular roof with hip ends on two sides has

no eaves.

eave on one side.

eaves on all four sides.

eaves on three sides.

eaves on two sides.

eaves on all four sides.

A bird's mouth cut in rafters is made at the ridge

(True or False)

False

The most commonly used material for floor sheathing in a wood light-frame building is

OSB panels.

Metal clips used to connect roof sheathing panels are generally

H shaped.

U shaped.

V shaped.

Either U or V shaped

 H-shaped.

The maximum number of stories allowed by the International Building Code for a fully sprinklered R-2 occupancy building in Type V(B) construction is

three.

In a podium-type building the horizontal separation assembly must have a minimum fire rating of

?

The podium structure in a podium-type building must be Type I(A) construction

(True or False)

True

In referring to a floor or roof of a building as a horizontal diaphragm the reference is with respect to

lateral loads.

Hold-down bolts when provided in a WLF wall building are used in

walls

Horizontal beveled wood siding is generally made by slicing a(n)

LVL member.

plywood member.

OSB member.

solid lumber piece.

glulam member.

solid lumber piece.

Horizontal wood siding material is generally finished smooth on the front and back faces

(True or False)

False

Each course of beveled horizontal wood siding is nailed to the wall through

?

Vertical joints between adjacent horizontal siding boards are generally

?

Fiber-cement siding is

combustible and prone to fungal decay.

noncombustible and not prone to fungal decay.

noncombustible but prone to fungal decay.

noncombustible and not prone to fungal decay.

An eave is generally horizontal and the rake is inclined

(True or False)

True

Gypsum board is one of the best materials for fire protection because

each molecule of gypsum contains two molecules of water that retard the progress of fire.

The most commonly used size for gypsum boards is

4 ft × 8 ft.

Of Types R and X gypsum board panels, both of the same thickness, Type R is more fire resistive.

(True or False)

False

One sheet of Type X gypsum board panel, 5/8 in. thick, used on each side of a stud wall gives a fire rating of

60 min.

Moisture-resistant gypsum board panels are generally

green in color.

High-impact gypsum board panels generally have

a steel lining at the back side.

a fiberglass mesh at the back side.

a plastic sheet at the back side.

None of these.

an aluminum foil lining at the back side.

a fiberglass mesh at the back side.

In a Sip, the insulation generally consists of

expanded polystyrene.

polyurethane

polyisocyanurate.

fiberglass.

extruded polystyrene.

expanded polystyrene.

The facing in a Sip generally consists of

OSB on both faces.

plywood on the exterior face and OSB on the interior face.

plywood on the exterior face and gypsum board on the interior face.

OSB on the exterior face and gypsum board on the interior face.

None of these.

OSB on both faces.