Building Construction Chapter 32 and 33 Quiz and Review Questions

A built-up roof membrane is generally finished with a. a single-ply roof membrane. b. aggregate surfacing. c. a flood coat of bitumen. d. all of the above. e. (b) and (c).

(b) and (c).

A roof square implies a. 1 ft 2 of roof area. b. 10 ft 2 of roof area. c. 100 ft 2 of roof area. d. 1 m2 of roof area. e. 10 m2 of roof area.

100 ft 2 of roof area.

The head lap in a four-ply built-up roof is a. 2 in. b. 4 in. c. 5 in. d. 6 in. e. none of the above.

2 in.

A low-slope roof is defined as a roof whose slope is less than a. 1:12. b. 1.5:12. c. 2:12. d. 2.5:12. e. 3:12.

3:12.

In a stick-built glass curtain wall, the mullions are typically spaced at a. 2 ft to 4 ft on center. b. 4 ft to 6 ft on center. c. 6 ft to 10 ft on center. d. 10 ft to 15 ft on center. e. as needed for the project.

4 ft to 6 ft on center.

The weight of aggregate surfacing on a built-up roof is generally a. 5 lb per roof square. b. 15 lb per roof square. c. 25 lb per roof square. d. 40 lb per roof square. e. 400 lb per roof square.

400 lb per roof square.

Explain what a cool roof is, and state it's advantages and limitations

A cool roof is used to reduce the solar heat absorption by using a white roof. This reduces the solar energy absorption by 20%. Which can reduce the roof surface temperature by as much as 15oF to 20oF reducing the peak cooling loads. Although this doesn't work well in areas with strong winters.

What is a roof cover board and what material is it made of? Explain.

A cover board is made of high-density fiberboard or perlite board. The typical thickness of ¾ in to 1 in

List the major differences between a glass curtain wall and a storefront.

A storefront is a large glass-aluminum wall that is generally one-story tall and extends from the ground to the second floor of the building. Three major differences distinguish wall from a storefront. The storefront wall lies under the second-floor structure of the building and, it is not spaced away from the structural frame of the building. The glazing systems performance for structural and nonstructural criteria is lower than that of a curtain wall iii. Rainwater that enters a curtain wall is drained by rail support of each individual lite. In a storefront system, the water entering through a lite must travel vertically down the mullion and be drained at the weep holes at the ground level.

What is the size of a typical built-up roof felt, and what is its relationship with a roof square?

A typical built-up roof felt is 36 in. wide and 36 ft long, making the area of the roll 108 ft2. In the roofing industry 108 ft2, is referred to as a factory square and 100 ft2 is called a roof square.

Which of the following modified bitumen membranes is generally torch applied? a. SBS-modified bitumen b. APP-modified bitumen

APP-modified bitumen

Which of the following built-up roof membranes is more commonly used? a. Asphalt built-up roof membrane b. Tar built-up roof membrane

Asphalt built-up roof membrane

Because of the general trend toward sustainable and organic construction, organic felts are increasingly replacing fiberglass felts in built-up roofs. a. True b. False

False

The environmental performance requirements for a storefront are generally much higher than those for a glass curtain wall. a. True b. False

False

For a building located in a high-wind region, which of the following roof systems is most suitable? a. Loose-laid ballasted single-ply system b. Fully adhered single-ply system c. Mechanically fastened single-ply system d. Gravel-covered built-up roof e. Protected membrane system

Fully adhered single-ply system

What are the functions of a roof cover board? Explain.

Its purpose is to add water protection to the insulation and provide nailing surface for the single-ply roof membrane.

List and briefly explain the life-safety issues in roofing design

Life safety impacts a roofs system selection such as, i. Fire-safety considerations ii. Wind-uplift and hail impact resistance iii. Drainage design

which of the following modified bitumen membranes is more elastomeric? a. SBS-modified bitumen b. APP-modified bitumen

SBS-modified bitumen

Using sketches and notes, explain how we increase the lateral load-bearing capacity of a standard glass-aluminum wall

To increase the lateral load-bearing capacity manufacturers have several standard sections designed to suit various regions. In a heavy lateral load region, they enclose structural steel sections within the mullions. The enclosed steel sections and the mullions are fastened together to produce a composite action between them.

A cant strip is not required in a base flashing detail with a single-ply roof membrane. a. True b. False

True

A typical glass curtain wall is provided with weep holes to drain infiltrating water even though it is sealed from both the inside and the outside with gaskets or tapes. a. True b. False

True

EPDM is a thermosetting plastic. a. True b. False

True

In a stick-built glass curtain wall, the mullions are erected first and the rails are inserted between them. a. True b. False

True

Low-slope roofs are more commonly used than steep roofs. a. True b. False

True

Which of the following roofing asphalts is commonly used for interply mopping? a. Type I b. Type II c. Type III d. Type IV e. None of the above

Type III

Which of the following represents an asphalt-treated fiberglass felt? a. Type II b. Type III c. Type IV d. No. 15 e. No. 30

Type IV

Which of the following roofing asphalts is commonly used for mopping an SBS-modified bitumen membrane? a. Type I b. Type II c. Type III d. Type IV e. SBS-modified asphalt

Type IV

A dragon wagon is used in laying a. a single-ply roof membrane. b. a modified bitumen roof membrane. c. a built-up roof membrane. d. all of the above. e. none of the above.

a modified bitumen roof membrane.

A loose-laid ballasted roof is generally used with a. a built-up roof membrane. b. a modified bitumen membrane. c. a single-ply membrane. d. all of the above.

a single-ply membrane.

Explain the differences between coal tar and asphalt as roofing bitumen, and state why coal tar is not commonly used

a. Asphalt is obtained from the distillation of crude oil at petroleum refineries. Asphalt has a greater availability and is cheaper b. Coal tar is obtained from the distillation of coal. Although the distillate in this process is coal tar, the residue is coke. Coke is used in the steel manufacturing industry. It isn't commonly used because of its health risks to the roofers

What is the difference between the terms felt and ply? List various asphalt-treated fiberglass roofing felts and briefly explain the differences between them

a. Felt are the individual sheets between bitumen mopping's in a built-up roof are referred to as felts. b. A felt and a corresponding layer of bitumen is referred to as a ply. c. Types of asphalt-treated fiberglass roofing felts i. Type I and Type II- are considered the flood coats due to its better weather characteristics ii. Type III- Is the most commonly used type. it is used as an interply adhesive and as an adhesive to bond insulation to the deck or to bond two layers of insulation together. iii. Type IV- Asphalt performs better than type III, but its lower durability is a deterrent. d. All types are mostly distinguished by their softening point temperature

Using sketches and notes, explain the differences between a single-span mullion support system and a twin-span mullion support system for a glass curtain wall a. In a single-span mullion support system b.In a twin-span mullion system

a. In a single-span mullion support system, each mullion extends only over one floor. DL anchors are, therefore, required at every floor level, except at the ground floor, where the building's foundation provides dead-load support to the first mullion length. b. In a twin-span mullion system, the mullions extend over two floors. Because a mullion can have only one dead-load support, DL anchors are provided at alternate floors. In a twin-span system, expansion anchors are also required at alternate floors

Explain the differences between an inorganic (fiberglass) roofing felt and an organic roofing felt

a. Organic felt is made from paper or wood fibers or a combination of both. b. Inorganic felt is made from glass fibers

Discuss the differences between SBS- modified and APP- modified bitumen roof membranes.

a. SBS (Styrene butadiene styrene)- has greater flexibility, and greater resistance to cold environment. b. APP (Attactic polypropylene)- Greater resistance to ultraviolet radiation.

Explain the purpose of the following items and state where they are used: (a) shear block, (b) pressure plate, and (c) adapter for spandrel glass

a. Shear blocks are used to fasten rails to the mullions. They are short aluminum extensions and fastened to the mullions with screws. Rails are snapped over the shear blocks, one shear block at each end of the rail. b. Pressure plates are used to hold the outside-glazed curtain wall. They are horizontal and vertical pieces fastened to the mullions and rails with screws. c. For spandrel glass they use a semirigid mineral wool insulation in between the curtain wall and the spandrel beam. The entire spandrel area of the curtain wall is provided with mineral wool insulation placed behind the spandrel glass. To prevent condensation between the glass and the insulation, a vapor retarder is provided in this area.

Explain the difference between thermosetting and thermoplastic roof members and give at least one example of each. How does the difference between the two types influence the sealing of lap seams between adjacent membranes?

a. Thermosetting polymer does not soften on heating once it is cured into hardness, like a boiled egg. Therefore, the seams in a thermosetting membrane cannot be heat welded but must be adhered together by an adhesive or a double-sided seam tape. The most commonly used is EPDM (Ethylene propylene diene monomer). b. Thermoplastic softens on heating and hardens on cooling repeatedly, like butter. Asphalt and coal tar behave like a thermoplastic. A thermoplastic material is heat weldable, which makes the seaming operation relatively easier.

In a protected membrane roof, the insulation is a. below the deck. b. between the deck and the membrane. c. above the membrane and fully adhered to it. d. above the membrane but loose laid over it. e. not used.

above the membrane but loose laid over it.

Perlite board (as cover board), sandwiched between the insulation and the roof membrane, is generally used with a. an asphalt-mopped membrane. b. a fully adhered single-ply membrane. c. a mechanically fastened single-ply membrane. d. a loose-laid, ballasted single-ply membrane.

an asphalt-mopped membrane.

In a stick-built glass curtain wall, the rails are typically spaced at a. 2 ft to 4 ft o.c. b. 4 ft to 6 ft o.c. c. 6 ft to 10 ft o.c. d. 10 ft to 15 ft o.c. e. as needed for the project.

as needed for the project.

A glass curtain wall in which the glass is pressure plate captured is glazed from the a. building's interior. b. building's exterior. c. (a) or (b).

building's exterior.

As shown in this text, a glass curtain wall in which the glass is structural silicone adhered is glazed from the a. building's interior. b. building's exterior. c. (a) or (b).

building's exterior.

In a glass curtain wall with pressure plate-captured glass, there are a. no covers. b. covers in both horizontal and vertical directions. c. covers only in the horizontal direction. d. covers only in the vertical direction.

covers in both horizontal and vertical directions.

The air infiltration rate through a glass curtain wall is specified in terms of a. pounds per square feet. b. cubic feet per minute. c. cubic feet under a given inside-outside air pressure difference. d. cubic feet per minute under a given inside-outside air pressure difference. e. none of the above.

cubic feet per minute under a given inside-outside air pressure difference.

The lap seams in an EPDM roof membrane are typically sealed by a. heat welding. b. liquid adhesives. c. single-sided tape. d. double-sided tape. e.any one of the above

double-sided tape.

With a steel deck topped with lightweight insulating concrete, the commonly used board insulation is a. iso board. b. polyurethane board. c. expanded polystyrene (EPS) board. d. not used with insulating concrete.

expanded polystyrene (EPS) board.

Glass curtain walls in which aluminum framing sections are specially profiled for a particular project are a. rare because of the prohibitive cost of manufacturing custom profiles. b. uncommon because of the extremely high cost of manufacturing custom profiles. c. not uncommon because the cost of custom profiles can be recovered from a few repeat mid-sized to large projects. d. fairly common because the cost of custom profiles can be recovered from one large project.

fairly common because the cost of custom profiles can be recovered from one large project.

The flashing around a pipe penetrating through the roof is a. base flashing b. curb flashing. c. flange flashing. d.none of the above

flange flashing.

The flashing around a roof drain is a. base flashing b. curb flashing. c. flange flashing. d. none of the above.

flange flashing.

The cover board generally used between a single-ply roof membrane and rigid board insulation is a. iso board. b. specially treated perlite board. c. glass-fiber-reinforced gypsum board. d. extruded polystyrene board. e. none of the above.

glass-fiber-reinforced gypsum board.

As shown in the text, a glass curtain wall with structural silicone-adhered glass a. has no exterior covers. b. has exterior covers in both horizontal and vertical directions. c. has exterior covers only in the horizontal direction. d. has exterior covers only in the vertical direction.

has exterior covers only in the horizontal direction.

The lap seams in a PVC roof membrane are typically sealed by a. heat welding. b. liquid adhesives. c. single-sided tape. d. double-sided tape. e. any one of the above.

heat welding.

The lap seams in a TPO roof membrane are typically sealed by a. heat welding. b. liquid adhesives. c. single-sided tape. d. double-sided tape. e. any one of the above.

heat welding.

The width of an expansion joint in the rails of a typical stick-built glass curtain wall a. is 1 in. standard. b. is 1/2in. standard. c. is 1/4in. standard. d. is 1/32in. standard. e. must be determined on project-by-project basis.

is 1/32in. standard.

Bitumen-treated fiberglass felt a. is less porous than bitumen-treated organic felt. b. is more porous than bitumen-treated organic felt. c. has the same porosity as bitumen-treated organic felt. d. none of the above.

is more porous than bitumen-treated organic felt.

Of the two single-ply roof membranes, EPDM and PVC, PVC is generally a. more flexible and more fire resistant. b. less flexible but more fire resistant. c. more flexible but less fire resistant. d. less flexible and less fire resistant.

less flexible but more fire resistant.

A slotted steel roof deck is mandated for use with a. all rigid board insulations. b. lightweight insulating concrete. c. foamed concrete. d. none of the above.

lightweight insulating concrete.

Counterflashing is generally a. made of PVC and is permanently anchored to the deck or parapet wall. b. made of PVC and is a removable item. c. made of sheet metal and is permanently anchored to the deck or parapet wall. d. made of sheet metal and is a removable item.

made of sheet metal and is a removable item.

1. A stick-built glass curtain wall consists of a. mullions and glass. b. rails and glass. c. mullions, rails, and glass. d. mullions, rails, and preassembled units. e. preassembled units and glass.

mullions, rails, and glass.

A stick-built glass curtain wall is anchored to the building's structure through a. mullions. b. rails. c. both mullions and rails. d. none of the above.

mullions.

The width of an expansion joint between adjacent mullion lengths in a typical stick-built glass curtain wall a. is generally 1 in. standard. b. is generally 1/2in. standard. c. is generally 1/4in.standard. d. is generally 1/16in.standard. e. must be determined on a project-by-project basis.

must be determined on a project-by-project basis.

In a cable-net-supported glass wall, the glass a. bears on (horizontal) rails. b. is connected to (vertical) mullions. c. both (a) and (b) above. d. is supported by a spider-shaped connector. e. none of the above.

none of the above.

In a glass wall supported by cable trusses, the glass a. bears on (horizontal) rails. b. is connected to (vertical) mullions. c. (a) and (b). d. none of the above.

none of the above.

The exposure (EX) of felts in a four-ply built-up roof is a. 2 in. b. 4 in. c. 6 in. d. 8 in. e. none of the above.

none of the above.

In a twin-span mullion system for a glass curtain wall, a. one dead-load anchor is provided at every floor level. b. two dead-load anchors are provided at every floor level. c. one dead-load anchor is provided at every alternate floor level. d. two dead-load anchors are provided at every alternate floor level. e. only one dead-load anchor is provided for the entire height of the wall.

one dead-load anchor is provided at every alternate floor level.

In a single-span mullion system for a glass curtain wall, a. one dead-load anchor is provided at every floor level. b. two dead-load anchors are provided at every floor level. c. one dead-load anchor is provided at every alternate floor level. d. two dead-load anchors are provided at every alternate floor level. e. only one dead-load anchor is provided for the entire height of the wall.

one dead-load anchor is provided at every floor level.

In a twin-span mullion system for a glass curtain wall, a. one expansion anchor is provided at every floor level. b. two expansion anchors are provided at every floor level. c. one expansion anchor is provided at every alternate floor level. d. two expansion anchors are provided at every alternate floor level. e. only one expansion anchor is provided for the entire height of the wall.

one expansion anchor is provided at every alternate floor level.

In a single-span mullion system for a glass curtain wall, a. one expansion anchor is provided at every floor level. b. two expansion anchors are provided at every floor level. c. one expansion anchor is provided at every alternate floor level. d. two expansion anchors are provided at every alternate floor level. e. only one expansion anchor is provided for the entire height of the wall.

only one expansion anchor is provided for the entire height of the wall.

Asphalt is a waste product obtained from a. the manufacturing of coal tar. b. the manufacturing of rubber. c. petroleum refining. d. the manufacturing of steel. e.none of the above.

petroleum refining.

A unitized glass curtain wall consists of a. mullions and glass. b. rails and glass. c. mullions, rails, and glass. d. mullions, rails, and preassembled units. e. preassembled units and glass.

preassembled units and glass.

A mechanically fastened single-ply roof membrane is generally used with a. steel roof decks. b. reinforced-concrete decks. c. precast-concrete decks. d. none of the above.

steel roof decks.

UL Class B represents a. the fire rating of a roof assembly. b. the wind-uplift resistance of a roof assembly. c. the hail-impact resistance of a roof assembly. d. none of the above.

the fire rating of a roof assembly.

FM MH represents a. the fire rating of a roof assembly. b. the wind-uplift resistance of roof assembly. c. the hail-impact resistance of roof assembly. d. none of the above.

the hail-impact resistance of roof assembly.

. FM 1-120 represents a. the fire rating of a roof assembly. b. the wind-uplift resistance of a roof assembly. c. the hail-impact resistance of a roof assembly. d. none of the above.

the wind-uplift resistance of a roof assembly.

A shear block is used a. at a mullion expansion joint to allow the mullion to move. b. at the dead-load anchor of a mullion. c. at the expansion anchor of a mullion. d. to connect a rail to adjacent mullions. e. none of the above.

to connect a rail to adjacent mullions.