Stairs and ramps, ceilings, acoustics, mechanical, lights

Question 1

Stairs - steps run

Answer 1

255 mm to 355 mm

Question 2

Stairs - steps rise

Answer 2

125 mm to 200 mm

Question 3

Rule of thumb for a well-proportioned stair

Answer 3

sum of 2 rises + one tread = 24-25” (610-635 mm)

Question 4

Min distance between handrail if stairs is area of evacuation?

Answer 4

50 or less occupants = 914 mm (36”)

50 or more occupants = 1118mm (44”)

Question 5

What is accessible width of stairs?

Answer 5

Distance between handrails

Question 6

Ramp minimum width between handrails?

Answer 6

900 mm

Question 7

Ramp maximum gradient?

Answer 7

1 to 12

Question 8

Minimum level area at top and bottom of a ramp and where a door is located in a ramp?

Answer 8

1670mm x 1670 mm

Question 9

Size of level area in a ramp and in which intervals?

Answer 9

1670mm long and at least the same width as the ramp
At intervals of not more than 9m along its length
Where there is a change of 90 degrees or more in the direction of the ramp

Question 10

Width of stairway requiring handrails

Answer 10

1100 or more

Question 11

width of stairs requiring intermediate handrails?

Answer 11

2200 , handrail should be continuous between landings and located so that there will be not more than 1650 mm between handrails

Question 12

Circular cross section of handrails?

Answer 12

30 mm to 43 mm

Question 13

Perimeter and largest cross-sectional dimension of non-circular handrails?

Answer 13

100mm to 125mm, cross sectional dimension not more than 45 mm

Question 14

Height of handrails on stairs and ramps

Answer 14

not less than 865 - 965mm

Question 15

Length a handrail should extend beyond top riser and bottom riser?

Answer 15

Top - at least 300 mm

Bottom - continue to slope for a depth of one tread beyond bottom riser followed by a 300mm horizontal extension

Question 16

Horizontal extension of handrail on a ramp?

Answer 16

300mm beyond top and bottom edges of the incline

Question 17

Which side of a ramp should have handrails?

Answer 17

both sides.

Question 18

What should be accommodated in a ceiling plenum?

Answer 18

lighting, partition attachments, supply and return air grilles and diffusers, speakers 9including fire alarm), sprinkler piping, smoke detectors, drapery pockets and other construction components

Question 19

When is a suspended ceiling used?

Answer 19

in most commercial construction

Question 20

Which type of ceiling is best acoustically?

Answer 20

Acoustic tile ceilings absorb sound (but do not prevent sound transmission to any appreciable extend
GWB ceilings reflect sound.

Question 21

Components of Suspended ceilings?

Answer 21

Acoustic Ceiling Tiles

Support grid of metal framing, which is suspended by wires from the structure

Question 22

Types of Acoustic ceiling tiles?

Answer 22

Wood fibre
mineral fibre
glass fibre
support grid of metal framing, which is suspended by wires from the structure

Question 23

Advantages of Acoustic ceiling tiles

Answer 23

low cost, fast installation, sound control, flexibility, adaptability to lighting and mechanical services, accessibility to the plenum
Excellent light reflectance and can be used for special applications such as clean rooms.
Wide variety of patterns, textures, colours and finishes
Some suppliers have good recycling programs

Question 24

Suspended Ceilings support grids types?

Answer 24

T-shaped grid system are the most common.
Regular system uses panels with rabbeted edges.
U-channel grid creates a reveal along the centre of the grid (more expensive)
Concealed grids ( usually 1’ x 1’ tiles), square or beveled edges (prevent chipping and conceal minor misalignments) - access more difficult

Question 25

Suspended ceilings common support grid sizes

Answer 25

24” x 24”, 24” x 48”
48” x 48” also available
20” x 60” available for buildings with 5’ working modules

Question 26

How suspended ceilings support grids are supported?

Answer 26

By attaching hanger wires to the structural slab above and spacing them 4’-0” apart.

Question 27

How suspended ceilings cross tees are assembled?

Answer 27

Snapped into pre-punched holes every 2 feet

Question 28

How tiles are supported on a suspended ceiling?

Answer 28

Tiles are supported by a ceiling angle, which is placed around the perimeter of the room and around columns and other obstructions.

Question 29

GWB ceilings components

Answer 29

Steel channels measuring 1 1/2” are located 4’ O.C. and are suspended from the structural floor or roof above with wires spaced 4’ O.C.
Metal furring channels (hat channels) are attached to the main runners either 16” or 24” O.C.
5/8” wallboard, 24” spacing

Question 30

GWB ceilings steel channels dimensions and installation

Answer 30

Steel channels measuring 1 1/2” are located 4’ O.C. and are suspended from the structural floor or roof above with wires spaced 4’ O.C.

Question 31

GWB ceilings metal furring channels attachment

Answer 31

Metal furring channels (hat channels) are attached to the main runners either 16” or 24” O.C.

Question 32

Dimensions and spacing of wallboard used on GWB ceilings?

Answer 32

5/8” wallboard, 24” spacing

Question 33

How lighting should be supported on a GWB ceiling?

Answer 33

Independently of the GWB

Question 34

Why access panel should be installed on a GWB ceiling and what size?

Answer 34

This type of ceiling lacks the accessibility of suspended acoustical ceilings.
24” square access panel opening is usually sufficient
Coordination of mechanical and electrical equipment locations is required to eliminate or minimize the need for access panels

Question 35

Advantage of GWB ceilings?

Answer 35

They can be formed into nearly any configuration.