020303c Commercial Exteriors

Question 1

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

A. A row of bricks
B. The cut bricks

Answer 1

A. The row of bricks.

Question 2

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

Answer 2

3

Question 3

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

A. Stucco
B. Panel
C. Cementitious

Answer 3

B. Panel

Question 4

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

Answer 4

Rain screen

Question 5

Brick cladding does not require expansion joints. T or F

Answer 5

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

Question 6

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

Answer 6

T

Question 7

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

Answer 7

Application of the vapour barrier.

Question 8

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

Answer 8

Precipitation should be deflected at the first defence.

Question 9

What is a creeper in regards to a Roman arch?

Answer 9

The cut bricks

Question 10

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

Answer 10

T

Question 11

What is the max slope of a low slope roof?

Answer 11

A slope equal to or less than 1:4

Question 12

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

Answer 12

The roof deck, insulation, roof membrane and flashings.

Question 13

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

Answer 13

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.

Question 14

Are roof decks always sloped for the purpose of drainage?

Answer 14

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

Question 15

Where can insulation be placed in relation to the deck?

Answer 15

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

Question 16

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

Answer 16

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

Question 17

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

Answer 17

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.

Question 18

Name three of the most common types of roof membranes?

Answer 18

1. Built up roofing
2. Modified bitumen
3. EPDM

Question 19

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

Answer 19

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

Question 20

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

Answer 20

T

Question 21

What is the primary purpose of flashing?

Answer 21

To prevent water intrusion at roof penetrations.

Question 22

What are the three major types of flashing?

Answer 22

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

Question 23

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

Answer 23

Roofing and flashing sealant.

Question 24

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

Answer 24

Parapet

Question 25

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

Answer 25

Scuppers and roof drains

Question 26

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

Answer 26

Scupper

Question 27

What is a Voussoirs in regards to a Roman arch?

Answer 27

The bricks that define the arch itself.

Question 28

Where is a curbed opening used?

Answer 28

Where there is a projection through the roof.

Question 29

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

Answer 29

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

Question 30

What causes the most frequent source of roof problems?

Answer 30

Flashings

Question 31

What is the rainscreen principal?

Answer 31

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.

Question 32

What is a curtain wall?

Answer 32

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

Question 33

What is the primary function of a curtain wall?

Answer 33

To separate the outside environment from the inside.

Question 34

What is cladding?

Answer 34

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

Question 35

What are some examples of cladding?

Answer 35

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

Question 36

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

Answer 36

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.

Question 37

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

Answer 37

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

Question 38

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

Answer 38

Thin slab veneers of sliced solid blocks of stone.

Question 39

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

Answer 39

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

Question 40

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

Answer 40

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

Question 41

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

Answer 41

T

Question 42

Why does brick cladding have expansion joints?

Answer 42

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

Question 43

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

Answer 43

Because of their tendency to absorb water.

Question 44

What is masonry?

Answer 44

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

Question 45

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

Answer 45

Reduce the total amount of expansion and contraction.

Question 46

What is stucco?

Answer 46

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

Question 47

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

Answer 47

Concrete

Question 48

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

Answer 48

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

Question 49

Can wood siding be installed in directions other than horizontally?

Answer 49

Yes. Vertically as well.

Question 50

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

Answer 50

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

Question 51

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

Answer 51

It expands and contracts much more than other cladding materials.

Question 52

How must cementitious siding be handled to reduce breakage?

Answer 52

Upright

Question 53

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

Answer 53

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.