Question 1

Which material is commonly used as Class III vapor retarder (VR)in stud walls?

Accepted Answer

No separate VR needed as latex- or enamel- painted gypsum board functions as Class III VR.

Question 2

Breathability of an air barrier refers to its

Accepted Answer

A) permeability to water. 
B) permeability to air, water vapor, and water. 
C) permeability to air and water vapor. 
D) permeability to air. 
E) none of the above. 
A) permeability to water. 
B) permeability to air, water vapor, and water. 
C) permeability to air and water vapor. 
D) permeability to air. 
E) none of the above. E

Question 3

Why are building components generally more vapor permeable than air permeable?

Accepted Answer

Air and vapor exert their own independent pressures on enclosure surfaces. The vapor pressure difference between the inside and outside is generally much higher than the corresponding air pressure difference. Consequently, it is much easier for vapor to permeate through the enclosure than air.

Question 4

An air barrier is generally used on

Accepted Answer

A) the ceiling. 
B) the walls. 
C) the roof. 
D) all of the above. 
A) the ceiling. 
B) the walls. 
C) the roof. 
D) all of the above.

Question 5

Explain why the micro- perforations in a membrane- type air- weather barrier allow water vapor to pass through but neither (liquid)water nor air.

Accepted Answer

The micro-perforations in a membrane-typ

Question 6

Does diffusion, as discussed in this chapter, apply to the diffusion of water or air through the building envelope?

Accepted Answer

Diffusion through the building

Question 7

During the heating season, the vapor flow in conditioned buildings is generally from

Accepted Answer

A) the outside to the inside of the envelope. 
B) the inside to the outside of the envelope. 
A) the outside to the inside of the envelope. 
B) the inside to the outside of the envelope.

Question 8

What measure should be taken to prevent surface condensation?

Accepted Answer

Make exterior walls highly ins

Question 9

Explain the difference between leakage and diffusion through building envelope assemblies.

Accepted Answer

Leakage occurs through uninten

Question 10

Using a sketch, explain why an air barrier is called an air- weather barrier.

Accepted Answer

An air barrier is called an air-weather

Question 11

List various methods of providing attic ventilation.

Accepted Answer

1. Soffit ventilation + gable

Question 12

Is the permeability of a material for air the same as its permeability for water vapor? Name some building materials that are impermeable to both air and water vapor.

Accepted Answer

The permeability values of a m

Question 13

If the air is saturated, what is its relative humidity (RH)?

Accepted Answer

The answer of If the air is saturated, what is...

Question 14

In which climates zones do the building codes mandate the use of vapor retarder (VR), and in which climate zones do they not?

Accepted Answer

Climate zones 5, 6,

Question 15

What are the advantages of attic ventilation in warm climates?

Accepted Answer

The air space in an attic is between the

Question 16

What is the difference between air leakage and ventilation of buildings?

Accepted Answer

Air leakage is unwanted ventilation of b

Question 17

A material whose perm rating in the U.S. system of units is 0.5 perm is a

Accepted Answer

A) Class I vapor retarder. 
B) Class III vapor retarder. 
C) Class IV vapor retarder. 
D) Class II vapor retarder. 
E) none of the above. 
A) Class I vapor retarder. 
B) Class III vapor retarder. 
C) Class IV vapor retarder. 
D) Class II vapor retarder. 
E) none of the above.

Question 18

During the heating season, the vapor pressure of the inside air in a typical dwelling in the northern United States is

Accepted Answer

A) greater than the outside air. 
B) the same as the outside air. 
C) lower than the outside air. 
A) greater than the outside air. 
B) the same as the outside air. 
C) lower than the outside air.

Question 19

Air leakage through a building envelope is a function of

Accepted Answer

A) the area of holes, cracks, and openings in the envelope. 
B) wind speed. 
C) materials of which the component is made. 
D) all of the above. 
E) A, B, and the inside- outside air temperature difference. 
A) the area of holes, cracks, and openings in the envelope. 
B) wind speed. 
C) materials of which the component is made. 
D) all of the above. 
E) A, B, and the inside- outside air temperature difference.

Question 20

When gable vents are provided to ventilate an attic space,

Accepted Answer

A) turbine vents are also necessary. 
B) ridge vents are also necessary. 
C) soffit vents are also necessary. 
D) no other vents are necessary. 
A) turbine vents are also necessary. 
B) ridge vents are also necessary. 
C) soffit vents are also necessary. 
D) no other vents are necessary.

Exam 6: Properties of the Envelope-II Air and Water Vapor Control

Which material is commonly used as Class III vapor retarder (VR)in stud walls?

Breathability of an air barrier refers to its

Why are building components generally more vapor permeable than air permeable?

An air barrier is generally used on

Explain why the micro- perforations in a membrane- type air- weather barrier allow water vapor to pass through but neither (liquid)water nor air.

Does diffusion, as discussed in this chapter, apply to the diffusion of water or air through the building envelope?

During the heating season, the vapor flow in conditioned buildings is generally from

What measure should be taken to prevent surface condensation?

Explain the difference between leakage and diffusion through building envelope assemblies.

Using a sketch, explain why an air barrier is called an air- weather barrier.

List various methods of providing attic ventilation.

Is the permeability of a material for air the same as its permeability for water vapor? Name some building materials that are impermeable to both air and water vapor.

If the air is saturated, what is its relative humidity (RH)?

In which climates zones do the building codes mandate the use of vapor retarder (VR), and in which climate zones do they not?

What are the advantages of attic ventilation in warm climates?

What is the difference between air leakage and ventilation of buildings?

A material whose perm rating in the U.S. system of units is 0.5 perm is a

During the heating season, the vapor pressure of the inside air in a typical dwelling in the northern United States is

Air leakage through a building envelope is a function of

When gable vents are provided to ventilate an attic space,

An Overview of the Building Delivery Process How Buildings Come Into Being

Design and Constructions Regulations

Loads on Buildings

Load Resistance the Structural Properties of Materials

Properties of the Envelope-I Thermal Properties

Fire and Smoke-Related Properties

Acoustical Properties of Materials

Principles of Joints and Sealants Expansion and Contraction Control

Principles of Sustainable Construction

Soils and Excavations

Below-Grade Construction Foundation Systems and Basements

Materials for Wood Construction-I Lumber

Materials for Wood Construction-Ii Engineered Wood Products, Fasteners, and Connectors

Wood Light-Frame Construction-I

Wood Light-Frame Construction-II

Structural Insulated Panel Construction

Material Steel and Steel Components

Structural Steel Construction

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Lime, Portland Cement, and Concrete

Concrete Construction-I Formwork, Reinforcement, and Slabs-On-Ground

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Masonry Materials-I Mortar and Brick

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Masonry and Concrete Bearing Wall Construction

Exterior Wall Cladding-I Principles of Rainwater Infiltration Control

Exterior Wall Cladding-II Masonry, Precast Concrete, and Gfrc

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

Glass, Glazing, and Light-Transmitting Plastics

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Exterior Wall Cladding-Iv Wall System in Glass

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Stairs

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