Deck 27: Exterior Wall Cladding-I Principles of Rainwater Infiltration Control

Question 1

A drip mechanism at the underside of a projecting horizontal surface counters the effect of

A)cohesive forces between water molecules.
B)adhesive forces between water molecules and the building surface.
C)gravity.
D)cohesive forces between water molecules and the building surface.
E)kinetic energy.

Answer 1

B

Question 2

The coping on a masonry fence wall is generally

A)sloped toward the outside.
B)sloped on both sides.
C)sloped toward the interior.
D)A, B, or C.
E)dead flat.

Answer 2

B

Question 3

A curtain wall is separated from the structural frame of the building by a minimum of

A)1 in.
B)2 in.
C)3 in.
D)4 in.
E)none of the above.

Answer 3

B

Question 4

In terms of water infiltration, the exterior masonry walls in historic buildings functioned as

A)drainage walls.
B)face- sealed barrier walls.
C)dam walls.
D)waterproof walls.
E)none of the above.

Question 5

In which of the two types of exterior walls-barrier wall or drainage wall-is flashing required?

Question 6

A backup wall is required in a(n)

A)veneer wall.
B)curtain wall.
C)infill wall.
D)all of the above.

Question 7

For a pressure- equalized drainage wall to function effectively, the air space must be continuous from floor to floor.

Question 8

Z- flashing is effective in

A)a horizontal lapped joint in cladding.
B)a horizontal butt joint in cladding.
C)a vertical lapped joint in cladding.
D)a vertical butt joint in cladding.
E)all of the above.

Question 9

An ideal pressure- equalized drainage wall is also referred to as a

A)rain- screen wall.
B)wind- screen wall.
C)no- pressure wall.
D)pressure- screen wall.
E)all of the above.

Question 10

Give a few examples of face- sealed exterior walls.

Question 11

A capillary break is a

A)vertical barrier between two abutting surfaces of different materials.
B)narrow space in an otherwise wide joint.
C)wider space in an otherwise narrow joint.
D)horizontal barrier between two abutting surfaces of different materials.
E)none of the above.

Question 12

Metal anchors are needed to transfer lateral loads to the backup wall in

A)all veneer walls.
B)some veneer walls.

Question 13

The coping on a roof parapet is generally

A)sloped toward the interior (roof).
B)sloped on both sides.
C)sloped toward the outside.
D)A, B, or C.
E)dead flat.

Question 14

A curtain wall is typically used in buildings whose structural system consists of a

A)reinforced- concrete frame structure or steel- frame structure.
B)steel- frame structure or load- bearing masonry wall structure.
C)load- bearing reinforced- concrete wall structure or load- bearing masonry wall structure.
D)load- bearing masonry wall structure.
E)all of the above.

Question 15

Which of the following exterior walls is a multilayered wall: a barrier wall or a drainage wall-and why?

Question 16

In an ideal pressure- equalized drainage wall,

A)the backup is provided with openings to equalize air pressure in the air space.
B)the joints in the cladding are sealed to control water infiltration.
C)the cladding resists all of the wind load.
D)the backup resists all of the wind load.
E)all of the above.

Question 17

The most important feature of an (exterior)drainage wall is

A)exterior cladding.
B)weep holes.
C)flashing.
D)waterproofing of the backup wall.
E)all of the above.

Question 18

What is capillary break?

Question 19

In terms of their ability to resist water penetration, did the thick exterior masonry walls used in historic buildings behave as reservoir walls or face- sealed walls? Explain.

Question 20

Suction that pulls wind- driven rain into the air space of a drainage wall takes place on the windward face of a wall.

Question 21

Explain the differences between a barrier wall and a drainage wall.

Question 22

Using sketches and notes, explain the important features of a drainage- type exterior wall.

Question 23

Because air pressure on the outside and inside faces of the exterior cladding in an ideal rain- screen wall are equal, does it mean that there is no water penetration through exterior cladding in such a wall?

Question 24

A curtain wall can only be used on a building with a reinforced concrete frame structure or a steel frame structure. There is a required, standard width of air space between the curtain wall and the structural frame of the building. What is that width?

Question 25

Using a sketch and notes, explain what a capillary break is and where it is commonly used.

Question 26

What does the air pressure equalization on the outside and inside faces of the exterior cladding in an ideal rain- screen wall mean in terms of water penetration through the wall?

Question 27

Name the important features of a drainage wall.

Question 28

Why can the infill walls not be used in contemporary construction?

Question 29

Using sketches and notes, explain the difference between an anchored veneer and an adhered veneer.

Question 30

Why must the backup in a rain- screen wall be airtight?

Question 31

List and then explain the two types of veneer walls.

Question 32

What is similar between an infill wall and a curtain wall in terms of the structural system for the building?

Question 33

Explain what a curtain wall is.

Question 34

What is different between an infill wall and a curtain wall in terms of the differences between the resulting facades?

Question 35

Provide one example of each of the two types of veneer walls-the anchored veneer wall and the adhered veneer wall.

Question 36

What is the wind load on exterior cladding in an ideal pressure- equalized drainage wall?

Question 37

Curtain walls can either be: (i)transparent, glass curtain walls or (ii)opaque curtain walls. What are the glass curtain walls generally constructed of?

Question 38

Curtain walls can either be: (i)glass- aluminum curtain walls or (ii)opaque curtain walls. What are the opaque curtain walls constructed of?

Question 39

What is the other commonly used term for the rain- screen wall?

Question 40

A rain- screen wall consists of all the essential elements of a drainage wall, which are: (i)exterior cladding, (ii)air space, (iii)water- resistant backup wall, (iv)flashing, and (v)weep holes. What is the most important additional element in a rain- screen wall that distinguishes it from a drainage wall?

Question 41

Explain why the air space in a pressure- equalized drainage wall must be compartmentalized.

Question 42

Using sketches and notes, explain the salient features of a pressure- equalized drainage wall.