Deck 29: Exterior Wall Cladding-III Stucco, Adhered Veneer, Eifs, Natural Stone, and Insulated Metal Panels

Question 1

Control joints are required to be more closely spaced on a stucco surface backed by a stud wall than on a stucco surface backed by a masonry wall.

Answer 1

True

Question 2

On wood- stud and cold- formed steel- stud- wall assemblies, stucco is typically applied in three coats. Beginning from the first to the last, the coats are generally called

A)prime coat, scratch coat, and finish coat.
B)brown coat, scratch coat, and finish coat.
C)prime coat, base coat, and finish coat.
D)prime coat, brown coat, and finish coat.
E)scratch coat, brown coat, and finish coat.

Answer 2

E

Question 3

The term EIFS is an acronym for

A)exterior insulation and finish system.
B)envelope insulation with finished stucco.
C)exterior insulation and finished stucco.
D)externally insulated finish system.

Answer 3

A

Question 4

In addition to water, a stucco base coat mix consists of

A)lime, glass fibers, and sand.
B)Portland cement, lime, and sand.
C)gypsum, lime, and sand.
D)gypsum, Portland cement, and sand.

Question 5

The thickness of the lamina in PB EIFS is approximately

A)1/16 in.
B)1 in.
C)1/2 in.
D)1/4 in.
E)1/8 in.

Question 6

The total thickness of stucco on a concrete or concrete masonry wall is generally

A)greater than that on a stud- backed wall.
B)the same as that on a stud- backed wall.
C)smaller than that on a stud- backed wall.

Question 7

Control joints on a stucco surface are formed by using accessories, which consist of

A)zinc.
B)galvanized steel.
C)PVC.
D)any one of the above.
E)none of the above.

Question 8

EIFS is classified into two categories: polymer- based (PB)EIFS and polymer- modified (PM)EIFS. Which of these two is more commonly used?

A)PB EIFS
B)PM EIFS

Question 9

In an adhered masonry veneer, the most commonly used masonry unit is

A)natural stone.
B)terracotta tiles.
C)regular bricks.
D)lightweight manufactured stone.
E)concrete masonry units (CMUs).

Question 10

Masonry units in an adhered masonry veneer

A)require grouting of joints after adhering the units.
B)require pointing of joints before adhering the units.
C)require grouting of joints while the units are being adhered.
D)do not require pointing of joints.

Question 11

Metal lath is required when stucco is applied on

A)concrete walls.
B)masonry walls.
C)stud- wall assemblies.
D)all of the above.
E)none of the above.

Question 12

In PB EIFS, the insulation commonly used is

A)expanded polystyrene.
B)polyisocyanurate.
C)extruded polystyrene.
D)fiberglass.
E)none of the above.

Question 13

Control joints on a stucco surface are provided primarily to

A)control differential movement between the stucco surface and the substrate.
B)control thermal expansion and contraction of the metal lath.
C)control drying shrinkage of stucco.
D)control thermal expansion and contraction of the stucco surface.

Question 14

On wood- stud and cold- formed steel- stud- wall assemblies, stucco is typically applied in three coats. The total typical thickness of the three coats is

A)7/8 in.
B)1 in.
C)1- 1/2 in.
D)1- 1/8 in.
E)1- 1/4 in.

Question 15

The required color of a stucco surface is

A)obtained by spray painting the surface with the required color after the finish coat has fully cured.
B)obtained by spray painting the surface with the required color immediately following application of the finish coat.
C)obtained by using colored Portland cement and lime.
D)integral to the mix of the finish coat.
E)integral to the mix of all coats used in stucco.

Question 16

When control joints are provided in a stucco- clad wall, expansion joints are unnecessary.

Question 17

Masonry units in an adhered masonry veneer on a stud wall are applied directly on

A)gypsum sheathing.
B)a stucco scratch coat over metal furring lath.
C)gypsum sheathing treated with a liquid- applied air- weather retarder.
D)a stucco brown coat.
E)any one of the above.

Question 18

In PB EIFS, the EIFS lamina consists of

A)insulation, mesh, and finish coat.
B)base coat, mesh, and finish coat.
C)base coat, insulation, and finish coat.
D)insulation, lath, base coat, and finish coat.

Question 19

In an adhered masonry veneer, masonry units are adhered to the backup surface using

A)polymer- modified masonry mortar.
B)epoxy resin.
C)an acrylic polymer bonding agent.
D)Portland cement slurry.
E)any one of the above.

Question 20

Metal lath, when used in stucco, is installed on the wall

A)between the second and finished stucco coats.
B)sandwiched between the first and second stucco coats.
C)before the application of the first stucco coat.
D)directly under the finish coat.

Question 21

A combined dead- load and lateral- load support anchor for stone cladding consists of

A)a stainless steel H- shaped bent plate.
B)a stainless steel L- shaped bent plate welded to a stainless steel flat plate.
C)a stainless steel J- shaped bent plate.
D)a stainless steel L- shaped bent plate.
E)none of the above.

Question 22

Backwrapping in an EIFS- clad wall refers to

A)wrapping the edges of the openings in the wall with a water- resistant tape.
B)wrapping the terminal edges of EIFS insulation with EIFS mesh.
C)wrapping the joints between EIFS insulation with a water- resistant tape.
D)wrapping the joints between EIFS insulation with EIFS mesh.

Question 23

In a stone- honeycomb wall cladding panel, the honeycomb is generally made of

A)aluminum.
B)stainless steel.
C)titanium.
D)copper.
E)none of the above.

Question 24

Impact- resistant EIFS generally has

A)one base coat and two finish coats.
B)one base coat and one finish coat.
C)two base coats and one finish coat.
D)three base coats and one finish coat.
E)two base coats and two finish coats.

Question 25

When vertical support channels are used in stone cladding, dead- load supports and tiebacks are not required for stone slabs.

Question 26

What is stucco?

Question 27

On a stud wall, the stucco is applied in three coats: scratch coat, brown coat and finish coat. In the scratch coat, the coated surface is scratched with a scratching tool. What is the purpose of scratches, and are the scratch lines horizontal, vertical, diagonal, or some other orientation?

Question 28

A stone- honeycomb panel is anchored to the backup wall using

A)stainless steel bolts.
B)separate dead- load supports and tiebacks.
C)two interlocking metal channels.
D)epoxy cement.

Question 29

The thickness of granite used in wall cladding is generally

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

Question 30

The requirements for control joints in an EIFS wall are

A)generally the same as those in a stucco- clad wall.
B)less stringent than those in a stucco- clad wall.
C)more stringent than those in a stucco- clad wall.
D)none; control joints are not required in an EIFS- clad wall.

Question 31

On a stud wall, the stucco is applied in three coats: scratch coat, brown coat and finish coat. Some stucco material manufacturers require a primer to be used before the application of the finish coat. What is the purpose of the primer (also called prime coat), how thick is it, and is the final color of stucco in the finish coat, in the primer, or in both?

Question 32

Expansion joints are required in an EIFS- clad wall.

Question 33

A bayonet clip in the stone cladding industry refers to

A)flashing retainer.
B)lateral- load support.
C)dead- load support.
D)none of the above.

Question 34

The purpose of lime in stucco mix is to impart plasticity and cohesiveness to the mix. What does plasticity and cohesiveness of mix mean?

Question 35

In an insulated wall metal panel, the insulation is sandwiched between

A)a metal sheet in the front and a fiberglass scrim at the back of the panel.
B)a metal sheet in the front and an acrylic sheet at the back of the panel.
C)a metal sheet on both sides.
D)none of the above.

Question 36

The weight of insulated metal panels and stone- honeycomb panels is approximately the same.

Question 37

In a stone- honeycomb wall cladding panel, the thickness of the stone is approximately

A)1/8 in.
B)1/4 in.
C)1/2 in.
D)1 in.
E)3/4 in.

Question 38

The term kerf in stone cladding industry refers to

A)dead- load support for a stone slab.
B)a slot in a stone slab.
C)a tieback anchor for a stone slab.
D)none of the above.

Question 39

The dead- load supports for each stone slab (in a stone- clad wall)are generally

A)two, placed in the center of the slab, one above the other.
B)two, placed at the same level at quarter points.
C)four, placed at the same level at quarter points.
D)three, placed at the same level at one- third points.
E)two, placed at the same level at one- third points.

Question 40

Stucco applied on a wall consists of: (i)base coat and (ii)finish coat. On a wood or cold- formed steel (CFS)stud wall, the base coat is applied in two coats. Name these coats in sequence of their application.

Question 41

Which type of sheathing is used to accept stucco backed by: (i)wood stud assembly and (ii)cold- formed steel (CFS)stud assembly?

Question 42

What are the differences between stucco applied on a CMU wall and that applied on a stud wall? Give reasons for the differences.

Question 43

Why are expansion joints required on a stucco wall?

Question 44

What is the time interval between scratch coat application and brown coat application?

Question 45

What is the purpose of lath in stucco? What is it made of?

Question 46

The lath in stucco, applied on a stud wall, must be backed by a water resistant layer-typically two layers of No. 15 roofing felt or one layer of No. 30 roofing felt. The assembly also requires an air- weather barrier (AWB). Explain why the roofing felt cannot function as an AWB in addition to providing water resistance. Which material is used as an AWB with stucco?

Question 47

What are the benefits of stucco cladding?

Question 48

How is a base coat stucco mix typically applied on a wall-by spraying it on or troweling it?

Question 49

What should be the time gap between the brown coat application and the finish coat application?

Question 50

The lath used in stucco is called self- furring lath. What does the term "self- furring" mean?

Question 51

Stucco surface, made of Portland cement and sand mix, shrinks on gaining strength, introducing tensile stress in it. Therefore, it is reinforced with metal lath, when used on a (wood or steel)stud wall, to resist the tensile stress. Why is a lath not required when stucco is applied on a CMU or reinforced concrete wall?

Question 52

Are control joints in stucco applied on stud walls farther apart than stucco applied on a CMU wall?

Question 53

How is the stucco finish coat typically applied on a wall-by spraying it on or troweling it?

Question 54

What are the limitations of stucco cladding?

Question 55

The base coat mix and finish coat mix for stucco are available in bags. In preparing a mix for application on a wall, which other materials are added to bagged mix for: (i)base coat and (ii)finish coat?

Question 56

What are the differences between stucco applied on a CMU wall and that applied on a reinforced concrete (RC)wall?

Question 57

The lath in stucco, applied on a stud wall, must be backed by a water resistant layer. Which materials are commonly used for this layer?

Question 58

Stucco applied on a stud wall consists of three coats. What is the thickness of each coat and the total thickness of stucco?

Question 59

A stucco surface, made of Portland cement and sand mix, shrinks on gaining strength, introducing tensile stress in it. Therefore, when stucco is applied on a (wood or steel)stud wall, it is reinforced with metal lath. Despite the lath reinforcement, a stucco wall requires control (shrinkage)joints. Why?

Question 60

What are the general guidelines for providing control joints in stucco applied on stud walls?

Question 61

Describe a stone installation system with cold- formed steel stud backup wall given in the book.

Question 62

In PB EIFS cladding, EPS insulation is adhered to the substrate, and subsequently EIFS lamina is constructed. What must be done before the construction of EIFS lamina?

Question 63

Explain the difference between PB EIFS and PM EIFS and why PB EIFS is more commonly used.

Question 64

Using a sketch, explain the anatomy of stucco applied over a metal- stud wall assembly, showing all components.

Question 65

How are base coat and finish coat applied in PB EIFS-by troweling on or spraying on?

Question 66

Does a PB EIFS cladding need control joints?

Question 67

How does a drainable PB EIFS differ from regular PB EIFS?

Question 68

Which stones are commonly used for exterior cladding and what are their thicknesses?

Question 69

How does an impact- resistant PB EIFS differ from regular PB EIFS?

Question 70

Which wall cladding system can look indistinguishable from stucco after completion? Which features in the two finished walls can help distinguish between them easily?

Question 71

EIFS industry divides EIFS systems in two classes. Name them and identify the one that is commonly used.

Question 72

Name some of the limitations of PB EIFS and how the design community overcomes them.

Question 73

Does a PB EIFS cladding need expansion joints? Explain.

Question 74

In an adhered masonry veneer wall, lightweight masonry units are adhered to a scratch- coated wall. In an alternative system, the scratch coat can be replaced with a prefabricated board. What is that board and what is its thickness?

Question 75

What is dimension stone?

Question 76

In the standard- set method of stone installation, each stone slab is provided with two dead load support anchors mid- height of the slab and two tieback anchors each at top and bottom of the slab. What is the shape of dead load anchors and tieback anchors?

Question 77

What does an EIFS lamina consist of and what is its thickness?

Question 78

In PB EIFS, expansion joint accessories are not used. How then are EIFS segments above and below the expansion joint treated at their terminations?

Question 79

In which cladding system is it easy to provide surface ornamentation, such as carved window sills, ornamental roof cornices and parapets, corner quoins, etc.?

Question 80

Lightweight masonry veneer units can be adhered to the backup wall, giving an adhered masonry veneer. Briefly explain this cladding system.