Question 1

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

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Question 2

What are building code recommendations for the provision of vapor retarders (VR)for various climate zones?

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Question 3

What measure should be taken to prevent concealed condensation?

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Question 4

Why is an air- weather barrier (AWB)not required on sloping roofs with an attic space?

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Question 5

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

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Question 6

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

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Question 7

What measure should be taken to prevent surface condensation?

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Question 8

Explain how air diffusion through a building envelope is reduced.

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Question 9

Name three classifications of vapor retarders and their vapor permeability values (perm ratings).

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Question 10

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

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Question 11

Where in the envelope is an air barrier installed?

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Question 12

How does the thickness of a material affect its vapor permeability (perm rating)?

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Question 13

What is concealed condensation and how does it differ from surface condensation?

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Question 14

Why is an air- weather barrier (AWB)not required on flat roofs?

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Question 15

What is the function of an air barrier and what is it made of?

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Question 16

Explain why an air barrier is called an air- weather barrier (AWB).

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Question 17

To be recognized as an air barrier, the building code requires its maximum air permeability to not exceed that of a commonly used building material. What is that material and its thickness?

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Question 18

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

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Question 19

In a building enclosure, such as a room, the air and water vapor are thoroughly mixed together. In terms of their diffusion (transmission)through the enclosure surfaces, do they behave as one gas? Explain.

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Question 20

Explain why the permeability values of air and water vapor through a component are not equal to each other.

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

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

What are building code recommendations for the provision of vapor retarders (VR)for various climate zones?

What measure should be taken to prevent concealed condensation?

Why is an air- weather barrier (AWB)not required on sloping roofs with an attic space?

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

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

What measure should be taken to prevent surface condensation?

Explain how air diffusion through a building envelope is reduced.

Name three classifications of vapor retarders and their vapor permeability values (perm ratings).

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

Where in the envelope is an air barrier installed?

How does the thickness of a material affect its vapor permeability (perm rating)?

What is concealed condensation and how does it differ from surface condensation?

Why is an air- weather barrier (AWB)not required on flat roofs?

What is the function of an air barrier and what is it made of?

Explain why an air barrier is called an air- weather barrier (AWB).

To be recognized as an air barrier, the building code requires its maximum air permeability to not exceed that of a commonly used building material. What is that material and its thickness?

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

In a building enclosure, such as a room, the air and water vapor are thoroughly mixed together. In terms of their diffusion (transmission)through the enclosure surfaces, do they behave as one gas? Explain.

Explain why the permeability values of air and water vapor through a component are not equal to each other.