mod 9

Question 1

Suspended ceilings are …….

Answer 1

designed to help keep outside noise from entering the room and to reduce noise levels occurring within the room itself.

Question 2

Sounds travel through air in a room as a …..

Answer 2

series of pressure waves.

Question 3

Sound waves have a frequency.

The frequency, or pitch, measured in hertz (Hz), is

Answer 3

the number of vibrations or cycles that occur in the wave in one second.

Question 4

The intensity of sound refers to its

Answer 4

degree of loudness or softness.

Question 5

Note that any sounds greater than 120 dBA can actually produce

Answer 5

a physical sensation.

Question 6

Sounds above 130 dBA can cause

Answer 6

pain and/or deafness.

Question 7

Integrated ceiling systems are available in units called

Answer 7

modules.

Question 8

Main runners are the …..

Answer 8

Primary support members of the grid system for all types of suspended ceiling systems.

Question 9

Cross runners (cross ties or cross tees) are …..

Answer 9

Inserted into the main runners at right angles and spaced an equal distance from each other, forming a complete grid system.

Question 10

Wall angles are ….

Answer 10

Installed on the walls to support the exposed grid system at the outer edges.

Question 11

Ceiling tiles are the….

Answer 11

Tiles that are laid in place between the main runners and cross ties to provide an acoustical treatment.

Question 12

Excess humidity during storage can cause

Answer 12

expansion of material and possible warp, sag, or poor fit after installation

Question 13

Reflected ceiling plans show in detail how

Answer 13

the ceiling will be constructed.

Question 14

Check to see if there is a reflected ceiling plan. If no reflected ceiling plan is found, check to see if a _____ is included.

Answer 14

shop drawing

Question 15

the mechanical, electrical, and plumbing (MEP) drawings must be referenced to ensure that ……

Answer 15

all ceiling penetrations are accounted for.

Question 16

In a typical suspended ceiling, the main runners are spaced 4’ apart and are usually run …….

Answer 16

parallel with the long dimension of the room.

Question 17

main runners are made 12’ in length and no more than ____ pieces can be cut from any one 12’ runner.

Answer 17

two

Question 18

In either case, the center lines that are laid out on the ceiling or floor can be transferred down from the ceiling, or up from the floor, to the level of the suspended ceiling by use of a ____ & ____

Answer 18

plumb bob and dry lines.

Question 19

The eye pins and hanger wires should be located on __________ in both directions.

Answer 19

4’ centers