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CMP 124 Exam 3| Solved Questions with Answers |Latest 2024
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CMP 124 Exam 3| Solved Questionswith Answers |Latest 2024
Sound intensity is measured in... - ✔✔Decibels
Controlling sound within a given room/area - ✔✔NRC (noise
reduction commission)
Controlling sound transmission to other rooms - ✔✔STC
(sound transmission class)
Sound absorption depends on: - ✔✔thickness of the porous material
size and number of pores
frequency of the sound
What does the sound transmission class do: - ✔✔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... - ✔✔higher the number the better
,how to improve STC of light weight assemblies by... -
✔✔adding fibrous insulation in stud cavities
use multiple gypsum board layers
decoupling gypsum board layer
qualities of Gypsum board - ✔✔natural ability to control heat
releases moisture
fire protection
sound control and noise reduction
hard/dense wall
Gypsum board strips (dimensions) - ✔✔12" to 16" wide x 48"
Gypsum board sheets (dimension) - ✔✔4'x8'
Gypsum Board thickness (dimension) - ✔✔1/4", 3/8", 1/2", 5/8"
Types of Drywall Board - ✔✔Regular (living room, dining room)
Type X - fire rated (kitchen, garage)
Pre-decorated
Moisture resistant (MR) (Green Board) (Bathrooms)
Blue Board (absorbs some impact)
, high impact (purple (denser material)
paperless (MMR) (Mold and Moisture Resistant)
Foil Backed (vapor barrier)
Exterior (waxy black coating)
Nailing measurements - ✔✔7" O.C ceiling, 8" O.C. wall
Screw measurements - ✔✔12" O.C ceiling, 16" O.C wall
Where do the strength in the sheets come from (drywall) - ✔✔Paper
How to prevent nail pops - ✔✔use shorter nails, use screws, use
dry lumber, use steel studs, use adhesives
materials for drywall compounds - ✔✔pre-mix and dry powder (hot mix)
Procedures for putting up drywall - ✔✔Install ceiling panels first
cut panels
match edges
span entire length of ceiling/wall
measurements for drywall (dimensions) - ✔✔8' stud = 92 5/8"
92 5/8" + 4 4/8"
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