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IRT301 > Lecture 6 > Flashcards

Lecture 6 Flashcards

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1
Q

What are the components of a GWB Ceiling?

A
  • Acoustic ceiling tile
  • Ceiling hangers and hanger wire
  • metal furring channel clip
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2
Q

What are the four main elements in a RCP?

A
  • Structural
  • Architectural
  • Electrical
  • Mechanical
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3
Q

What are structural components in an RCP?

A
  • Walls
  • Beams
  • Columns
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4
Q

What are architectural components in an RCP?

A
  • Changes in ceiling plane/bulkheads/finishes
  • Doors
  • Windows
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5
Q

What are electrical components in an RCP?

A
  • Lighting
  • Switches/circuitry
  • Sensors (fire alarm)
  • Cabling
  • Audio visual equipment (speakers, projectors, projection screens)
  • Door operator
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6
Q

What are mechanical components in an RCP?

A
  • Sprinklers
  • Hvac (ductwork, vents)
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7
Q

Which direction does the cut line go in a RCP?

A

Upwards

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8
Q

What are the 8 main annotations on a RCP?

A
  1. Titleblock
  2. Room names
  3. Gridlines
  4. Dimensions
  5. Legend
  6. Materials
  7. Heights
  8. Notes for special elements/unique circumstances
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9
Q

What can acoustic ceiling tiles be made from?

A
  • Wood fibre
  • Mineral fibre
  • Glass fibre
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10
Q

How do acoustic ceiling tiles stay in place?

A

Set in a support grid of metal framing, which is suspended by wires from the structure.

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11
Q

What are the advantages of acoustic ceiling tiles?

A
  • Low cost
  • Fast installation
  • Sound control
  • Flexibility
  • Adaptability to
    lighting and mechanical services
  • Accessibility to the plenum
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12
Q

What is the plenum?

A
  • The space between a structural ceiling and a dropped ceiling, serving as a pathway for air circulation in HVAC systems, and sometimes housing communication cables
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13
Q

What’s the most common shape of support girds?

A

T-shape

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14
Q

What is a rabbeted edge?

A

A groove or recess cut into the edge of a piece of material, usually wood, to allow another piece to fit snugly into it, forming a joint.

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15
Q

In supports grids, concealed grids usually use ____ x ____ tiles?

A

1 foot x 1 foot

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16
Q

What is a beveled edge?

A

A slanted or angled surface that connects two surfaces, typically at an angle other than 90 degrees, creating a smooth transition and a softer look and feel

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17
Q

What are the benefits of a beveled edge?

A

Beveled edges
help prevent edge chipping and conceal minor misalignments

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18
Q

What are the most common grid sizes?

A

24” x 24”

24” x 48”

However 48” x48” tiles are also
available

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19
Q

How is the gird supported?

A

The grids are supported by attaching hanger wires to the structural slab above and spacing them 4’-0” apart

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20
Q

Cross tees are snapped into pre-punched holes every ______?

A

2 feet

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21
Q

Where are ceiling angles placed?

A

Placed around the perimeter of the room and around columns and other obstructions

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22
Q

In a GWB ceiling, metal furring channels (hat channels) are attached to the main runners either ___ or ____
O.C.

A

16 in

24in

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22
Q

In a GWB ceiling, steel channels measuring ____ are located ____ on centre and are suspended from the
structural floor or roof above with wires spaced _____

A

1 1/2 inches

4 feet

4 feet OC

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23
Q

For most commercial construction ____ spacing with ____ wallboard is used

A

24”

5/8”

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24
What must be installed in GWB ceiling for access?
Access panels
25
How large is the access panel in a GWB ceiling?
24in
26
What's the advantage of GWB ceilings?
The advantage of GWB ceilings is that they can be formed into nearly any configuration.
27
Sound travels in ____?
Waves
28
Low frequency sound is louder or quieter?
Quiet
29
High frequency sound is louder or quieter?
Louder
30
What is ambient or background noise?
The totality of all sounds within a room when the room is unoccupied.
31
What are The ABC’s of Acoustics?
Absorb – materials Block – space planning Cover – sound masking
32
What are the 3 types of sound control?
1. Within a room 2. Between rooms 3. Throughout a building
33
What are the 3 acoustic principles?
- Reflection - Absorption - Diffusion
34
What is sound reflection?
When sound is redirected from hard surfaces with little attenuation
35
Sound absorption depends on what?
The degree of absorption is dependent on the material chosen.
36
What is sound diffusion?
Scatters sound, reduces echoing and evens background noise
37
What does NRC stand for?
Noise Reduction Coefficient
38
Which material is most effective for absorbing sound in large open offices? 1. Direct gluedown carpet on concrete - NRC .30 2. Fibreglass wall panelling - NRC .80 3. Suspended acoustic tile 5/8” - NRC .60 4. Heavy velour drapes - NRC .60
Suspended acoustic tile ⅝’’ NRC .60 The ceiling tile covers the most area of the room, whereas wall panels aren’t necessarily all around a room.
39
Where do sound masking units get installed?
Within the plenum space
40
What are the 2 main factors to consider for sound control between rooms?
- Space planning - Construction: floor and wall assemblies
41
What are ways/examples of blocking sound through space planning?
- Zone activities of similar noise levels and use - Use utility spaces as buffers - Use closets and bookshelves to separate spaces/activities - Offset doors - Minimize area of partition between rooms
42
What does STC stand for?
Sound transmission class
43
What's the average STC range?
40-45
44
Insulation is _______ than layers of GWB
Cheaper
45
What are the best type of partitions to provide the best sound separation?
Slab to slab
46
Sound is produced when an _____ _______
Object vibrates
47
Sound attenuation is achieved in a metal stud partition by (4)
- Adding more layers of wallboard (mass) - Using resilient channels (dampening), - Using batt insulation within the stud cavity (absorption); or - A combination of these elements
48
Openings in an acoustic assembly but be sealed with?
Acoustic sealants
49
Partition strategies to help mitigate the transference of sound (3)
- Running the partition slab to slab through the ceiling or raised floor provides the highest level of sound separation - Suspending a partition from the structural floor above down to the top of the ceiling grid is also effective(which is cheaper than a slab to slab wall) or - Suspending sheet lead from the structural floor above down to the ceiling
50
What does db stand for?
Decibels
51
What does htz stand for?
Hertz
52
What does STC mean?
Ability of a material of assembly to block sound
53
What does IIC stand for?
Impact insulation class
54
What does IIC (impact insulation class) mean?
Measure of an assembly’s resistance to the transmission of structure-borne or impact noise.
55
What occupancy group must the ceiling tile meet for the particular flame spread rating.
D occupancy
56
Nearly all acoustical ceiling tiles have a _______ rating
Class A
57
Most acoustic ceiling tiles have NRC rating of ___ or higher
0.5
58
What does CAC stand for?
Ceiling Attenuation class
59
What does AC stand for?
Articulation Class
60
What does AC rating mean?
This is the measurement of sound reflected from the ceiling to adjacent workspaces in open office plans
61
Sound masking levels should be ____
45-48 db
62
The units for hearing/sound are in?
Hertz

IRT301 (6 decks)

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