Question 1

The approximate R- value of an air space in a wall with an aluminum foil lining is

Accepted Answer

A) R- 1.5. 
B) R- 2.0. 
C) R- 2.5. 
D) R- 1. 
E) none of the above. 
A) R- 1.5. 
B) R- 2.0. 
C) R- 2.5. 
D) R- 1. 
E) none of the above. C

Question 2

Determine the U- factor of the following roof assembly. The opaque part of the assembly, with an area of 2,500 ft2, has an overall R- value of 35. There is a skylight in the roof, which has an area of 100 ft2, and its overall
R- value is 2.0.

Accepted Answer

To determine the U-factor of the roof assembly, we need to calculate the U-factor for both the opaque part and the skylight, and then find the weighted average based on their respective areas.

The U-factor is the inverse of the R-value, which is a measure of thermal resistance. The formula to convert R-value to U-factor is:

U-factor = 1 / R-value

First, let's calculate the U-factor for the opaque part of the roof:

U-factor (opaque) = 1 / R-value (opaque)
U-factor (opaque) = 1 / 35
U-factor (opaque) = 0.02857 (rounded to five decimal places)

Next, let's calculate the U-factor for the skylight:

U-factor (skylight) = 1 / R-value (skylight)
U-factor (skylight) = 1 / 2.0
U-factor (skylight) = 0.5

Now, we need to find the weighted average U-factor for the entire roof assembly. To do this, we multiply the U-factor of each part by its respective area and then divide by the total area of the roof.

Weighted U-factor = (U-factor (opaque) * Area (opaque) + U-factor (skylight) * Area (skylight)) / Total Area

Total Area = Area (opaque) + Area (skylight)
Total Area = 2,500 ft² + 100 ft²
Total Area = 2,600 ft²

Weighted U-factor = (0.02857 * 2,500 ft² + 0.5 * 100 ft²) / 2,600 ft²
Weighted U-factor = (71.425 + 50) / 2,600
Weighted U-factor = 121.425 / 2,600
Weighted U-factor ≈ 0.04670 (rounded to five decimal places)

Therefore, the weighted average U-factor for the entire roof assembly, taking into account both the opaque part and the skylight, is approximately 0.04670.

Question 3

Provide the approximate q- value (R- value for 1 in. thick material)for EPS and XPS.

Accepted Answer

q- value for EPS = 4.0. q- value for XPS = 5.0.

Question 4

The concept of aged R- value is applicable to

Accepted Answer

A) perlite board insulation. 
B) fiberglass insulation. 
C) all insulating materials. 
D) all building materials. 
E) insulating materials that contain HCFC gas. 
A) perlite board insulation. 
B) fiberglass insulation. 
C) all insulating materials. 
D) all building materials. 
E) insulating materials that contain HCFC gas.

Question 5

One of the main reasons for using HCFC gas in some insulating materials is that it

Accepted Answer

A) makes the material more economical. 
B) makes the material more resistant to decay. 
C) makes the material noncombustible. 
D) increases the strength of the material. 
E) none of the above. 
A) makes the material more economical. 
B) makes the material more resistant to decay. 
C) makes the material noncombustible. 
D) increases the strength of the material. 
E) none of the above.

Question 6

The U.S. Department of Energy's climate zones are based on

Accepted Answer

A) the exterior air temperature. 
B) the exterior humidity. 
C) precipitation. 
D) A and B. 
E) B and C. 
A) the exterior air temperature. 
B) the exterior humidity. 
C) precipitation. 
D) A and B. 
E) B and C.

Question 7

Using the appropriate table, determine the individual R- values of the following materials:
a. 4- in. nominal (actual 3- 5/8in.)- thick brick wall
b. 5/8- in.- thick gypsum board
c. 2- in.- thick extruded polystyrene (XPS)board

Accepted Answer

To determine the R-values for the materi

Question 8

Where does Climate Zone 0 exist?

Accepted Answer

In very hot equatori

Question 9

The walls of a conditioned basement must be insulated over the entire depth of the wall.

Accepted Answer

A) True 
 B)False

Question 10

Why are insulating materials low- density (light- weight)materials?

Accepted Answer

The insulating materials are lightweight

Question 11

Why do we generally use the R- value of an assembly corresponding to its air- to- air heat transfer?

Accepted Answer

Air- to- air heat transfer means heat tr

Question 12

How is aluminum foil lining typically provided in an attic air space?

Accepted Answer

By laminating aluminum foil to

Question 13

Which of the following materials has the smallest value of emissivity?

Accepted Answer

A) Fiberglass 
B) Highly polished metal 
C) Metal 
D) Highly compressed fiberglass 
E) All of the above have the same value of emissivity. 
A) Fiberglass 
B) Highly polished metal 
C) Metal 
D) Highly compressed fiberglass 
E) All of the above have the same value of emissivity.

Question 14

Which of the following insulations is combustible?

Accepted Answer

A) Perlite board 
B) Fiberglass 
C) Vermiculite 
D) Extruded polystyrene (XPS)board 
E) Foamed concrete 
A) Perlite board 
B) Fiberglass 
C) Vermiculite 
D) Extruded polystyrene (XPS)board 
E) Foamed concrete

Question 15

Using sketches and notes, explain why it is unnecessary to insulate under an entire concrete slab- on- ground.

Accepted Answer

Insulating under an entire concrete slab

Question 16

The use of aluminum foil in attics is more useful in warm climates than in cold climates.

Accepted Answer

A) True 
 B)False

Question 17

Insulation is most effective if it is placed

Accepted Answer

A) in the center of the assembly. 
B) on the outside face of the assembly. 
C) on the inside face of the assembly. 
A) in the center of the assembly. 
B) on the outside face of the assembly. 
C) on the inside face of the assembly.

Question 18

Which of the following plastic foam insulation contains air within its voids?

Accepted Answer

A) Expanded polystyrene (EPS)board (bead board) 
B) Polyisocyanurate board (ISO board) 
C) Extruded polystyrene (XPS)board 
A) Expanded polystyrene (EPS)board (bead board) 
B) Polyisocyanurate board (ISO board) 
C) Extruded polystyrene (XPS)board

Question 19

What are high- thermal- capacity materials? What is the definition of mass walls per the International Energy Conservation Code? In which climates are high- thermal- capacity materials effective?

Accepted Answer

High-thermal-capacity materials are subs

Question 20

The composition of an insulating material is such that its solid constituents trap air (or gas)in extremely small volumes. Why does the entrapment of large volumes of air (or gas)reduce the insulating property of the material?

Accepted Answer

When large volumes of air (or gas)are tr

Exam 5: Properties of the Envelope-I Thermal Properties

The approximate R- value of an air space in a wall with an aluminum foil lining is

Determine the U- factor of the following roof assembly. The opaque part of the assembly, with an area of 2,500 ft2, has an overall R- value of 35. There is a skylight in the roof, which has an area of 100 ft2, and its overall R- value is 2.0.

Provide the approximate q- value (R- value for 1 in. thick material)for EPS and XPS.

The concept of aged R- value is applicable to

One of the main reasons for using HCFC gas in some insulating materials is that it

The U.S. Department of Energy's climate zones are based on

Using the appropriate table, determine the individual R- values of the following materials: a. 4- in. nominal (actual 3- 5/8in.)- thick brick wall b. 5/8- in.- thick gypsum board c. 2- in.- thick extruded polystyrene (XPS)board

Where does Climate Zone 0 exist?

The walls of a conditioned basement must be insulated over the entire depth of the wall.

Why are insulating materials low- density (light- weight)materials?

Why do we generally use the R- value of an assembly corresponding to its air- to- air heat transfer?

How is aluminum foil lining typically provided in an attic air space?

Which of the following materials has the smallest value of emissivity?

Which of the following insulations is combustible?

Using sketches and notes, explain why it is unnecessary to insulate under an entire concrete slab- on- ground.

The use of aluminum foil in attics is more useful in warm climates than in cold climates.

Insulation is most effective if it is placed

Which of the following plastic foam insulation contains air within its voids?

What are high- thermal- capacity materials? What is the definition of mass walls per the International Energy Conservation Code? In which climates are high- thermal- capacity materials effective?

The composition of an insulating material is such that its solid constituents trap air (or gas)in extremely small volumes. Why does the entrapment of large volumes of air (or gas)reduce the insulating property of the material?

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-II Air and Water Vapor Control

Fire and Smoke-Related Properties

Acoustical Properties of Materials

Principles of Joints and Sealants Expansion and Contraction Control

Principles of Sustainable Construction

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Below-Grade Construction Foundation Systems and Basements

Materials for Wood Construction-I Lumber

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Exterior Wall Cladding-I Principles of Rainwater Infiltration Control

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

Glass, Glazing, and Light-Transmitting Plastics

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