I7 - Describe Demountable Ceilings

Question 1

What gives the acoustic tile its acoustical properties?

Answer 1

1) Acoustic tiles are soft
2) pinholes absorb sound

Question 2

What special considerations must be made when applying gypsum board to ceilings with supports at 600 MM (24”) O.c

Answer 2

5/8 or 1/2 controlled density board should be used to prevent sagging of the ceiling.

Question 3

What special considerations must be made when applying gyprock board to ceilings with supports at 600 mm (24”) OC?

Answer 3

5/8 board or controlled density board should be used to prevent sagging of ceiling

Question 4

Why is a textured finish usually used with drywall ceilings?

Answer 4

Textured ceilings are much easier to finish due to texture hiding flaw in finish

Question 5

What is done to hide nailing in wood paneling?

Answer 5

Fastener are installed just above tongue just to hide them in TNG joint.

Question 6

What is the standard size of ceiling tile used with suspended ceilings?

Answer 6

2x4 or 2x2

Question 7

How are ventilation grills supported?

Answer 7

A separate hanger system must support grills.

heavy grills may need a system of 1/4 steel rods.

Question 8

How long are main tees?

Answer 8

12’

Question 9

What is the purpose of the slot in a 4 foot cross tee?

Answer 9

Slot in centre of 4’ cross tee used for 2x2 ceiling

Question 10

What is the difference between a carrying channel and a furring channel?

Answer 10

Carrying channel - heavy gauge steel supported by hanger wires spaced at 48” Oc within 6” of ends

Furring channel - light gauge steel attached to carrying channels or wood joists.

Question 11

What is used to support the gypsum board in a suspended ceiling when the spacing between the carrying channels is greater than 1200 mm (48”)

Answer 11

Furring channels attached at 600 mm OC max

Question 12

What must be done before beginnings to build cabinet drops?

Answer 12

Check drawings must be accurate

Question 13

What is resilient furring used for?

Answer 13

Sound proofing

Question 14

List three architectural reasons for using dropped ceilings?

Answer 14

1) Improve acoustics
2) Create shapes to define room spaces
3) Reflect lights.

Question 15

In kitchen and washroom, what kind of ceiling tile would you use?

Answer 15

Smooth-finished ceilings - easier to wash

Question 16

Ceiling tile comes in many sizes the most common is:

Answer 16

12 x 12, 16 x 16 and 16 x 24.

Question 17

Unless the tiles are being installed over drywall, underside or ceiling joists are strapped with:

Answer 17

19 mm thick furring boards on centres that match the tile dimensions.

Question 18

Interlocking tiles are installed with:

Answer 18

staples

Question 19

Square edge tiles are installed with:

Answer 19

adhesive

Question 20

Ceiling tiles can be installed how?

Answer 20

Surface mounted grid system that is installed tight to the underside of joists.

Question 21

Acoustic tile is?

Answer 21

Acoustic tile is made from:

Fibre board, provides thermal insulation and improves the acoustics in the room

Question 22

Thickness of wood panel ceiling?

Answer 22

5/16 to 1”

Question 23

Purpose of suspended ceiling types and components?

Answer 23

Exposed grid allows the top of tracks of demountable partitions to be fastened to it without damaging the ceiling finish.

Question 24

How do you install eyelet into concrete?

Answer 24

Hole are drilled and specially designed concrete sleeve anchor hangers are hammered up into holes and then lightly pulled to set sleeve.

Question 25

What kind of hanger wire is used?

Answer 25

10 g steel wire approx 3mm that has been pre-stressed. Comes in 10' lengths. Packaged straight and not rolled up. Alllows it to hang straight after being tied.

Question 26

Hanger wire length can be adjusted by:

Answer 26

Bending and twisting as in Figure 5 or using preformed with end hooks and a sliding adjustment bracket.

Question 27

What is a wall mold?

Answer 27

L-shaped metal molding attached to the wall. Supports the edges of the ceiling tile.

Question 28

Wall mold is attached to framing how?

Answer 28

Screws or roofing nails spaced at 600 mm OC

Question 29

What is the main Tee?

Answer 29

Known as main beam - Supporting member of the grid system.

Question 30

Main Tee is supported with wire how often?

Answer 30

Every 4'

Question 31

Main tee has slots where?

Answer 31

3" from the ends and then every 6" to allow placement of the cross tees. Main Tee come in 12' lengths.

Question 32

What are cross tees?

Answer 32

Cross tee span from main to main tee. Either 2' or 4' in length. Cross teee has 1.2m slot in mid point allowing 6 mm cross tee to be inserted.

Question 33

Most tiles are designed to fit into a:

Answer 33

600 mm x 1200 mm ( 2 ' x 4 ' ) grid system. Tiles themselves are slightly smaller to allow them to be easily slipped into place.

Question 34

What is a ventilation grill?

Answer 34

Designed to fit into a 600 x 600 mm grid space.

Question 35

Heavy grills are supported how?

Answer 35

Not bear upon the cieling grid, may consist of 1/4" steel rods securely fastened to overhead supports.

Question 36

Light fixtures are designed to fit in:

Answer 36

600 x 1200 mm (2 ' x 4 ' ) grid space. Must be independently supported.

Question 37

Seiesmic ceilings supported how?

Answer 37

with special joiners

Question 38

Dropped ceiling projects how far beyond face of cabinets?

Answer 38

1"

Question 39

What is a carrying channel?

Answer 39

Heavy gauge steel channel. Usually 38 mm (11/2") wide with 13 mm (1/2) channel legs. Support channels with hanger wire at 1200 mm (48") and within 6" of their ends.

Question 40

How to attach furring and steel studs to the carrying channel?

Answer 40

With tie wire. Attach gypsum board to the furring or stud with screws.