Materials & Methods Chapter 29, Exam 3 questions

The thickness of granite used in wall cladding is generally

1 1/4 in.

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

1/4 in.

The thickness of the lamina in PB EIFS is approximately

1/8 in.

Masonry can contribute a possible 24 points to the LEED categories.

24

Fire walls must be constructed of noncombustible materials, have a minimum fire rating of ____hours, and have sufficient structural stability under fire conditions to allow collapse of construction on either side without collapse of the wall.

4

The exact location of control and expansion joints will be affected by design features that create points of weakness or high stress concentration, therefore, vertical movement joint locations should be one side of openings that are _______ or less in width

5 feet

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

7/8 in.

Movement in a masonry structure is accommodated through

All of the above

The best defense against freeze-thaw damage in brick masonry is

Both a. & b.

Concrete, stucco, and concrete masonry products shrink temporarily.

False

Control joints in CMU construction must be void of mortar or other hard fillers.

False

Heat flows from cold to hot.

False

Joint reinforcement is normally continued across control joints.

False

Masonry construction is both vapor and air resistant.

False

Masonry walls will fail (structurally) in a fire.

False

Roof and floor slabs poured directly on brick bearing walls are usually safe from curl from opposing concrete shrinkage and brick expansion.

False

The application of plaster to one or both sides of a clay or concrete masonry wall will not increase the fire rating of the assembly.

False

The terms control joint and expansion joint are interchangeable.

False

Units with less than 50% cored area are considered solid, and units with more than 50% cored area are classified as hollow.

False

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

False

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

False

__________________ at the brick lug serves as a bond break between the masonry and the foundation and allows independent movement without cracking.

Flashing

The most common method of shrinkage crack control is the use of _____________ joint reinforcement.

Horizontal

The relative cost of different types of brick or different types of architectural block is related primarily to unit size and ________________________.

Labor Production

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

PB EIFS

The 45-minute and 60-minute rated glass blocks can be used for _______________________in 1-hour-rated masonry and steel stud walls.

Protected Openings

An 8-in. hollow brick wall contains less mass than an 8-in. solid brick wall, and it therefore offers less resistance to fire and heat transmission.

True

Brick veneer walls expand in length more than the stud frame or CMU backing walls.

True

Control joints are continuous, weakened joints designed to accommodate the permanent shrinkage of Portland cement-based products such as concrete, stucco, and concrete masonry.

True

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.

True

Cracking is not as likely to occur in fully reinforced masonry construction, as reinforcing steel absorbs much more tensile stress than that absorbed by wire joint reinforcement.

True

Expansion joints are open (void) joints that close as the brick expands.

True

Expansion joints are required in an EIFS-clad wall.

True

Fired bricks are at their smallest dimension when leaving the kiln.

True

Glazed brick are especially susceptible to freeze-thaw damage.

True

Isolation joints are used to separate masonry construction from adjacent or surrounding materials.

True

Masonry construction is not susceptible to rust, rot or decay from exposure to the elements.

True

Recycled materials are not often used in the manufacture of clay brick.

True

Steel frame construction is vulnerable to fire damage and must be protected from heat and flame.

True

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

True

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

a metal sheet on both sides.

The term "kerf" in stone cladding industry refers to

a slot in a stone slab.

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

a stainless steel L-shaped bent plate welded to a stainless steel flat plate.

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

a stucco scratch coat over metal furring lath.

In the prefabricated, panelized stone cladding system, stone slabs are backed by

a truss consisting of structural steel members.

Masonry is very cost-competitive as an envelope material, but the decision to use masonry of one type or another is usually a (an) __________________________.

aesthetic one.

All building materials expand and contract to some degree with changes in

all of the above

The exact location of control and expansion joints will be affected by design features that create points of weakness or high stress concentration. Rule-of-thumb vertical movement joint locations for both brick and block construction include:

all of the above

What promotes drying and decreases the possibility of freeze-thaw damage?

all of the above

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

aluminum.

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

any one of the above.

In PB EIFS, the EIFS lamina consists of

base coat, mesh, and finish coat.

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

before the application of the first stucco coat.

A ________________ material such as board insulation or roofing felt should be used to isolate the masonry from steel, and flexible anchors should be used to accommodate differential movement.

bond break

Brick parapet walls can develop cracking problems caused by differential movement. The major cause is

both (a.) & (b.).

A key element in fire control and balanced fire protection is the______________ of a building to contain fire and smoke.

compartmentation

Control joints on a stucco surface are provided primarily to

control drying shrinkage of stucco.

If sealants are required on the exterior of a brick wall, the color should be selected to blend with either the units or the mortar color but should be slightly

darker rather than lighter.

A bayonet clip in the stone cladding industry refers to

dead-load support.

In PB EIFS, the insulation commonly used is

expanded polystyrene.

The term EIFS is an acronym for

exterior insulation and finish system.

Masonry is heavy, so it can absorb and store heat and substantially retard its migration. This characteristic is called ____________________.

heat capacity

Masonry products are generally ________ and do not contribute to indoor air quality problems.

inert

The required color of a stucco surface is

integral to the mix of the finish coat.

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

manufactured stone.

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

masonry mortar.

The requirements for control joints in an EIFS wall are

none; control joints are not required in an EIFS-clad wall.

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

portland cement, lime, and sand.

Masonry units in an adhered masonry veneer

require pointing of joints after adhering the units.

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

scratch coat, brown coat, and finish coat.

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

smaller than that on a stud-backed wall.

Metal lath is required when stucco is applied on

stud-wall assemblies.

Impact-resistant EIFS generally has

two base coats and one finish coat.

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

two interlocking metal channels.

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

two, placed at the same level at quarter points.

Backwrapping in an EIFS-clad wall refers to

wrapping the terminal edges of EIFS insulation with EIFS mesh.