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CMP 124 Exam 3 Questions With Revised
Answers
What is purpose of Insulation - answer✔✔Stop heat transfer, stop sound transmission
What are 3 methods of heat transfer - answer✔✔Conduction, convection, radiation
how does heat move through conduction - answer✔✔movement of heat through a solid or liquid
Convection moves - answer✔✔From one region to another
Where does radiation heat come from - answer✔✔Sun, when it hits objects
What type of R-value is in 2x4 walls - answer✔✔R11, R13, R15
Advantages of Cellulose insulation - answer✔✔High thermal value, low air infiltration, fire
resistance, noise reduction
Flexible insulation types - answer✔✔Batt, Blanket, Wrapped, faced, friction fit
Rigid Insulation types - answer✔✔fiber board (low cost), OSB plywood,
Extruded R-value - answer✔✔5
Expanded R-value - answer✔✔3.5
Foam in place installation method - answer✔✔Inject into wall cavity, spray on wall surface
Foam installation material - answer✔✔polyurethane
What is soffit baffles purpose - answer✔✔attic ventilation - ice damming
What does NRC stand for - answer✔✔Noise Reduction Coefficient
What does STC stand for - answer✔✔Sound Transmission Class
Sound intensity is measured in... - answer✔✔Decibels
Controlling sound within a given room/area - answer✔✔NRC (noise reduction commission)
, ©THEBRIGHTSTARS 2024
Controlling sound transmission to other rooms - answer✔✔STC (sound transmission class)
Sound absorption depends on: - answer✔✔thickness of the porous material
size and number of pores
frequency of the sound
What does the sound transmission class do: - answer✔✔Deals with the design and use of
construction materials to control the noise transmission through walls, floors, ceilings, doors,
window openings
STC has a number rating... - answer✔✔higher the number the better
how to improve STC of light weight assemblies by... - answer✔✔adding fibrous insulation in
stud cavities
use multiple gypsum board layers
decoupling gypsum board layer
qualities of Gypsum board - answer✔✔natural ability to control heat
releases moisture
fire protection
sound control and noise reduction
hard/dense wall
Gypsum board strips (dimensions) - answer✔✔12" to 16" wide x 48"
Gypsum board sheets (dimension) - answer✔✔4'x8'
Gypsum Board thickness (dimension) - answer✔✔1/4", 3/8", 1/2", 5/8"
Types of Drywall Board - answer✔✔Regular (living room, dining room)
Type X - fire rated (kitchen, garage)
Pre-decorated
Moisture resistant (MR) (Green Board) (Bathrooms)
Blue Board (absorbs some impact)
CMP 124 Exam 3 Questions With Revised
Answers
What is purpose of Insulation - answer✔✔Stop heat transfer, stop sound transmission
What are 3 methods of heat transfer - answer✔✔Conduction, convection, radiation
how does heat move through conduction - answer✔✔movement of heat through a solid or liquid
Convection moves - answer✔✔From one region to another
Where does radiation heat come from - answer✔✔Sun, when it hits objects
What type of R-value is in 2x4 walls - answer✔✔R11, R13, R15
Advantages of Cellulose insulation - answer✔✔High thermal value, low air infiltration, fire
resistance, noise reduction
Flexible insulation types - answer✔✔Batt, Blanket, Wrapped, faced, friction fit
Rigid Insulation types - answer✔✔fiber board (low cost), OSB plywood,
Extruded R-value - answer✔✔5
Expanded R-value - answer✔✔3.5
Foam in place installation method - answer✔✔Inject into wall cavity, spray on wall surface
Foam installation material - answer✔✔polyurethane
What is soffit baffles purpose - answer✔✔attic ventilation - ice damming
What does NRC stand for - answer✔✔Noise Reduction Coefficient
What does STC stand for - answer✔✔Sound Transmission Class
Sound intensity is measured in... - answer✔✔Decibels
Controlling sound within a given room/area - answer✔✔NRC (noise reduction commission)
, ©THEBRIGHTSTARS 2024
Controlling sound transmission to other rooms - answer✔✔STC (sound transmission class)
Sound absorption depends on: - answer✔✔thickness of the porous material
size and number of pores
frequency of the sound
What does the sound transmission class do: - answer✔✔Deals with the design and use of
construction materials to control the noise transmission through walls, floors, ceilings, doors,
window openings
STC has a number rating... - answer✔✔higher the number the better
how to improve STC of light weight assemblies by... - answer✔✔adding fibrous insulation in
stud cavities
use multiple gypsum board layers
decoupling gypsum board layer
qualities of Gypsum board - answer✔✔natural ability to control heat
releases moisture
fire protection
sound control and noise reduction
hard/dense wall
Gypsum board strips (dimensions) - answer✔✔12" to 16" wide x 48"
Gypsum board sheets (dimension) - answer✔✔4'x8'
Gypsum Board thickness (dimension) - answer✔✔1/4", 3/8", 1/2", 5/8"
Types of Drywall Board - answer✔✔Regular (living room, dining room)
Type X - fire rated (kitchen, garage)
Pre-decorated
Moisture resistant (MR) (Green Board) (Bathrooms)
Blue Board (absorbs some impact)
