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020303 > 020303c Commercial Exteriors > Flashcards

020303c Commercial Exteriors Flashcards

1
Q

Which of the following part of a Roman arch describes the Course?

A. A row of bricks
B. The cut bricks

A

A. The row of bricks.

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2
Q

In commercial applications, stucco is typically applied in ___ coats to wood structures.

A

3

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3
Q

Which of the following siding is limited by its short lifespan?

A. Stucco
B. Panel
C. Cementitious

A

B. Panel

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4
Q

What approach to precipitation and moisture control is typically used with solid sheet cladding?

A

Rain screen

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5
Q

Brick cladding does not require expansion joints. T or F

A

F. Brick cladding must have expansion joints to allow for differential movement and expansion of the cladding and the structural frame.

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6
Q

Unit masonry may be supported by the building foundation or metal angle iron attached to the building itself. T or F

A

T

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7
Q

What is the first step when installing expansion joints between two large roof sections?

A

Application of the vapour barrier.

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8
Q

What is the main principal of the barrier approach to keeping a building watertight?

A

Precipitation should be deflected at the first defence.

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9
Q

What is a creeper in regards to a Roman arch?

A

The cut bricks

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10
Q

A curtain wall does not have to be very thick. T or F

A

T

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11
Q

What is the max slope of a low slope roof?

A

A slope equal to or less than 1:4

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12
Q

What are the four basic elements of every low slope roof?

A

The roof deck, insulation, roof membrane and flashings.

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13
Q

Low slopes may have slopes as low as 1:50. T or F

A

T but at this low slope, attention to detail is critical since any deviation from the proper slope will result in a low point that collects water.

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14
Q

Are roof decks always sloped for the purpose of drainage?

A

The roof deck OR the insulation on the roof deck is sloped to a roof drain.

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15
Q

Where can insulation be placed in relation to the deck?

A

Under the deck, on top of the deck on top of the deck and water membrane.

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16
Q

Are air/vapour barriers required in buildings with low sloped roofs?

A

Yes; air vapour barriers are required on all buildings built in climates where freezing temps are a possibility.

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17
Q

What is one reason for putting gravel on top of a low sloped roof?

A

It reduces damage from the sun, foot traffic and hail. It can also be used as a ballast to prevent insulation from blowing off. Also increase fire resistance.

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18
Q

Name three of the most common types of roof membranes?

A
  1. Built up roofing
  2. Modified bitumen
  3. EPDM
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19
Q

What is the advantage of having the membrane below the insulation in single ply roofing?

A

The membrane would not be subjected great temperature differences or ultraviolet light and therefore last much longer.

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20
Q

Having the membrane below the insulation acts as the vapour barrier in the building envelope. T or F

A

T

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21
Q

What is the primary purpose of flashing?

A

To prevent water intrusion at roof penetrations.

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22
Q

What are the three major types of flashing?

A

Base flashing - deals the horizontal roof membrane to the vertical projection

Counter flashing - used to prevent water from migrating behind the base flashing

Cap flashing - covers the horizontal surface of roof penetrations

23
Q

What type of sealant must be used on the roof structure?

A

Roofing and flashing sealant.

24
Q

What is the short wall at the perimeter of a roof called?

A

Parapet

25
Q

What two methods are employed for controlling water flow from a low slope roof?

A

Scuppers and roof drains

26
Q

A hole at the bottom of the parapet that leads water to a downspout is called a _____ .

A

Scupper

27
Q

What is a Voussoirs in regards to a Roman arch?

A

The bricks that define the arch itself.

28
Q

Where is a curbed opening used?

A

Where there is a projection through the roof.

29
Q

Vinyl siding is not very sensitive to temperature changes and doesn’t need to be allowed to expand and contract. T or F

A

F. It is very sensitive to temperature changes and must be allowed to expand and contract.

30
Q

What causes the most frequent source of roof problems?

A

Flashings

31
Q

What is the rainscreen principal?

A

Reduces the effects of capillary action, gravity, momentum, surface tension and air pressure differences by providing a space behind the cladding for any moisture that makes it through the cladding to drain away.

32
Q

What is a curtain wall?

A

A curtain wall is a wall that carries no load other than its own.

33
Q

What is the primary function of a curtain wall?

A

To separate the outside environment from the inside.

34
Q

What is cladding?

A

Cladding is any part of the vertical building exterior that is directly exposed to the environment.

35
Q

What are some examples of cladding?

A

Windows and their frames, masonry, concrete, natural stone, metal, wood and stucco.

36
Q

Name and describe the 2 approaches to keeping a building watertight.

A
  1. The barrier effect - blocking as a first defence.
  2. The rainscreen approach - put a cover around a building but provides some method of water control should it get past the first line of defence.
37
Q

What is the prime difficulty when using glass as a cladding material?

A

The method used must hold it in position and prevent water leakage at the same time.

38
Q

Solid blocks of naturally occurring stones look can be achieved by what building material?

A

Thin slab veneers of sliced solid blocks of stone.

39
Q

What are the most frequently used types of stone for solid block stone veneers?

A

Marble, travertine, granite, limestone, slate and sandstone.

40
Q

What is the most common provision used for solid sheet cladding?

A

Provide an airspace between the veneer and the interior wall. High quality sealant and weep holes must also be used.

41
Q

Masonry should use angle irons at each floor to compensate for volumetric changes. T or F

A

T

42
Q

Why does brick cladding have expansion joints?

A

To allow for differential movement and expansion of the cladding and the structural frame.

43
Q

Why are blocks used as cladding generally covered with stucco or paint?

A

Because of their tendency to absorb water.

44
Q

What is masonry?

A

Use of preformed unit blocks or natural stone units attached to one another with mortar.

45
Q

Why are masonry units such as bricks supported individually at each floor?

A

Reduce the total amount of expansion and contraction.

46
Q

What is stucco?

A

Cladding material made up of sand, Portland cement and lime.

47
Q

What product has proven to be the most durable and easily mounded cladding?

A

Concrete

48
Q

What special considerations are to be made after the application of stucco?

A

Should not be allowed to freeze or dry out before it has hydrated.

49
Q

Can wood siding be installed in directions other than horizontally?

A

Yes. Vertically as well.

50
Q

What are the five most common types of horizontal wood siding?

A

Clap board, bevel siding, rabbeted, ship lap, drop

51
Q

What is one of the main characteristics of vinyl siding that must be considered during application?

A

It expands and contracts much more than other cladding materials.

52
Q

How must cementitious siding be handled to reduce breakage?

A

Upright

53
Q

What is the basic structure of exterior insulation and finish systems?

A

Layer of rigid insulation followed by a layer of mesh embedded with a base coat of the proprietary coating. This is followed by a layer of the finish coat.

020303 (7 decks)

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