CSLB C-17 Glazing (Trade Exam) — All Questions

In the federal guide specification, what Shore A durometer range applies to closed-cell neoprene setting blocks?

• a.30 to 50
• b.95 to 100
• c.70 to 90✓
• d.10 to 20

The specification calls for dense extruded neoprene setting blocks of Shore A 70 to 90. Thirty to 50 is too soft to carry glass, 95 to 100 is too hard, and 10 to 20 is far too soft.UFGS 08 81 00

What setting block material does one glass manufacturer require for all glazing systems?

• a.Neoprene with a PVC jacket
• b.100 percent silicone✓
• c.Hardwood
• d.Natural rubber

That manufacturer requires only 100 percent silicone setting blocks of Shore A 85 ± 5. Natural rubber, jacketed neoprene and wood are not allowed in its guideline.Viracon Glazing Guidelines - Standard

A lite 108 inches wide sits on a sill. At what two distances from one vertical edge are the blocks centered?

• a.13-1/2 inches and 94-1/2 inches
• b.27 inches and 81 inches✓
• c.36 inches and 72 inches
• d.54 inches

Quarter points of 108 inches are 27 and 81 inches. A center block is at 54, 13-1/2 and 94-1/2 are eighths, and 36 and 72 are thirds.Pilkington ATS-192 General glazing guidelines (2013)

What is the minimum length of an edge block in the glass manufacturer's guideline?

• a.1/2 inch
• b.24 inches
• c.12 inches
• d.3 inches✓

The guideline calls for edge blocks at least 3 inches long, placed anywhere along the jamb. Half an inch is too short to locate the lite, and 12 and 24 inches exceed the stated minimum.Pilkington ATS-192 General glazing guidelines (2013)

A lite is 60 by 90 inches in a dry-glazed system. What is the maximum total edge force at 10 pounds per linear inch?

• a.30,000 pounds
• b.300 pounds
• c.1,200 pounds
• d.3,000 pounds✓

The perimeter is 300 inches and 300 × 10 = 3,000 pounds. The 1,200 is the minimum at 4 pounds per inch, 300 is the perimeter, and 30,000 shifts the decimal.Pilkington ATS-192 General glazing guidelines (2013)

What does the glass manufacturer say about face shims?

• a.Face shims replace setting blocks
• b.Face shims must be spaced at 12 inches
• c.Intermittent face shims should not be used✓
• d.Face shims are required at every corner

Face clearance is kept by a continuous cushioning material, not intermittent shims. Spaced shims, shims as blocks and corner shims are not the practice described.Pilkington ATS-192 General glazing guidelines (2013)

An insulating unit arrives with a corner chipped by handling. What does the guide specification say about units?

• a.Fill the chip with sealant and set the unit
• b.Do not grind, nip or cut a unit after delivery✓
• c.Nip the corner off to remove the chipped area
• d.Grind the chip smooth on site with a fine wheel

Units are not modified after leaving the factory, so a damaged unit is replaced. Grinding on site alters the factory edge, nipping the corner removes glass from a sealed unit, and filling the chip with sealant leaves the damaged glass in place to break later.UFGS 08 81 00

What is a rolling block used for?

• a.To measure the opening before the glass is cut
• b.To level the sill before the glass is set
• c.To turn a unit on a corner without damaging it✓
• d.To roll the glass out of its shipping crate

A rolling block spreads the glass weight along the edges when a unit is rotated on a hard surface. It does not move crates, level sills or measure openings.Pilkington ATS-192 General glazing guidelines (2013)

What does the guide specification require of sashes that receive laminated glass?

• a.Glaze them without setting blocks under the lite
• b.Seal them tightly so that no water can enter
• c.Weep them to the outside so water can drain✓
• d.Fill them with sealant to the top of the glass

Sashes receiving laminated glass must be weeped to the outside so water drains, since wet edges delaminate. Sealing, filling and omitting blocks do not drain the pocket.UFGS 08 81 00

What does the guide specification say about field cutting heat-absorbing glass?

• a.Not permitted; use clean factory edges✓
• b.Permitted with a wheel cutter on site
• c.Permitted if the cut edges are ground
• d.Permitted when it is below 40°F

Heat-absorbing glass must have clean-cut, factory-fabricated edges and field cutting is not permitted. Cutting with a wheel, grinding afterward and temperature do not change the rule.UFGS 08 81 00

At what outdoor temperature may glazing start under the federal guide specification, absent approved warming procedures?

• a.Above 40°F and rising✓
• b.Above 20°F and rising
• c.Above 32°F and rising
• d.Above 80°F and rising

The specification says not to start until the temperature is above 40 degrees Fahrenheit and rising. Twenty and 32 degrees are too cold, and 80 degrees is not required.UFGS 08 81 00

A balcony guard has a glass infill panel with its bottom edge 8 inches above the deck and a total area of 3 square feet. Is it a hazardous location?

• a.Yes, since glazing in guards is always hazardous✓
• b.Yes, but only where the glass is above 36 inches
• c.No, because the bottom edge is under 18 inches
• d.No, because the pane is under 9 square feet

Glazing in guards and railings is hazardous regardless of area or height above a walking surface. The 9-square-foot and 18-inch conditions apply to windows, and there is no 36-inch condition for guards.2025 CBC §2406.4.4

A window is 12 square feet with its bottom edge 10 inches above the floor, its top edge 82 inches above the floor, and a walkway 20 inches from the glass. Is it hazardous under the Building Code?

• a.No, since the pane is too large to be hazardous
• b.Yes, only if there is a handrail
• c.No, since the top edge is over 36 inches
• d.Yes, since all four conditions are met✓

The pane exceeds 9 square feet, the bottom edge is under 18 inches, the top edge is over 36 inches and a walking surface is within 36 inches, so all four conditions are met. A single condition does not rule it out, and a rail would be an exception, not a trigger.2025 CBC §2406.4.3

A fixed lite beside a door is 20 inches from the door's vertical edge and its bottom edge is 70 inches above the floor. Is it hazardous under the Building Code?

• a.No, since the bottom edge is 60 inches or more✓
• b.Yes, since every fixed lite is hazardous
• c.No, since fixed lites are exempt as a class
• d.Yes, since the lite is within 24 inches

Glazing next to a door is hazardous only if its bottom exposed edge is less than 60 inches above the walking surface, and 70 is not. Distance alone does not decide it, and fixed lites are not exempt as a class.2025 CBC §2406.4.2

A glass panel faces a bathtub and its bottom exposed edge is 48 inches above the tub floor. Is it hazardous?

• a.Yes, but only if the panel exceeds 9 square feet
• b.Yes, since the bottom edge is under 60 inches✓
• c.No, since bathtubs are not named in the code
• d.No, since the bottom edge is above the 36-inch line

Glazing in walls and enclosures facing bathtubs and showers is hazardous where the bottom exposed edge is less than 60 inches above the standing or walking surface. Thirty-six inches is not the limit, tubs are listed, and no area condition applies.2025 CBC §2406.4.5

In a store, a window's bottom edge is 50 inches above the walking surface of a stair. Under the Building Code, is it hazardous at stairs?

• a.No, since the limit is under 36 inches
• b.No, since stairs are not covered
• c.Yes, only with a guard
• d.Yes, since the limit is under 60 inches✓

The Building Code treats glazing as hazardous at stairways where the bottom exposed edge is less than 60 inches above the walking surface. The 36-inch limit is the Residential Code's, and a guard creates exceptions, not hazard.2025 CBC §2406.4.6

How does the guide specification say sheet glass is cut and set?

• a.With no regard to the direction of the lines
• b.With the visible lines or waves set on the diagonal
• c.With the visible lines or waves running vertical
• d.With the visible lines or waves horizontal✓

Sheet glass is cut and set with the visible lines or waves horizontal. Vertical, diagonal or random orientation changes the appearance.UFGS 08 81 00

A swinging door has a lite whose opening cannot pass a 3-inch-diameter sphere. What does the code say about glazing in that opening?

• a.It is excepted from the hazardous-location rule✓
• b.It still has to be Category II safety glazing
• c.It still has to be tempered glass in all cases
• d.It still has to be laminated glass in all cases

The code excepts glazed openings through which a 3-inch-diameter sphere cannot pass, so the hazardous-location rule does not apply. That is why Category II glazing, tempered glass and laminated glass are each not required by that rule.2025 CBC §2406.4.1

Which product is Category II under 16 CFR 1201?

• a.A mirror hung on a dressing-room wall
• b.Sliding glass doors of the patio type✓
• c.A door with only 5 square feet of glass
• d.Any fixed window in a house

Sliding patio-type glass doors are Category II regardless of size. Windows outside doors and enclosures are outside the standard's scope, a door with 9 square feet or less of glass is Category I, and a wall mirror is a different product.16 CFR 1201.2

How wide is a setting block relative to the glazing channel in the glass manufacturer's guideline?

• a.Half the width of the channel
• b.1/2 inch less than the channel width
• c.Wider than the channel it sits in
• d.1/16 inch less than the channel width✓

Blocks are 1/16 inch narrower than the channel or positively located so they cannot shift. Half an inch less, wider or half-width blocks do not fit that rule.Pilkington ATS-192 General glazing guidelines (2013)

On a fire-rated glass label, what does the letter H indicate?

• a.The glazing has been heat-treated in a furnace
• b.The glazing is intended for hospital buildings
• c.The glazing meets hose-stream requirements✓
• d.The glazing is intended for hinged doors only

H indicates the glazing meets the hose-stream requirements of the door test standard. It does not refer to hospitals, heat treatment or hinged doors.2025 CBC §716.1.2.2.1

What does "OH" on fire-protection-rated glazing indicate?

• a.Fire window use, meeting fire and hose-stream tests✓
• b.Use in fire doors only, with no hose-stream test
• c.Use outdoors where hazards are present
• d.No hose-stream test, only a furnace test

OH indicates the glazing meets the fire protection and hose-stream requirements of NFPA 257 or UL 9 for fire windows. It is not limited to doors, it includes the hose stream, and it is not about outdoor hazards.2025 CBC §716.1.2.2.2

A required rating is 45 minutes. May a labeled 90-minute lite be used?

• a.Yes, since a higher rating is permitted✓
• b.Yes, but only after a variance is granted
• c.No, since only the exact rating is allowed
• d.No, since 90-minute glass is made for doors only

The code permits glazing marked with a rating that exceeds the required rating. Exact-only, doors-only and variance rules do not apply.2025 CBC §716.1.2.2.4

What is the maximum area of fire-protection-rated glazing used as a vision panel in a self-closing horizontal-exit door?

• a.25 square inches
• b.1,000 square inches
• c.100 square inches✓
• d.100 square feet

Such vision panels are limited to 100 square inches. One hundred square feet is far larger, and 25 and 1,000 square inches are not the limit.2025 CBC §716.2.5.1.2.1

A rated wall is 18 feet long and 9 feet high. What is the maximum area of fire-protection-rated glazing in windows in it?

• a.18 square feet
• b.40.5 square feet✓
• c.162 square feet
• d.81 square feet

The wall is 162 square feet and 25 percent is 40.5 square feet. Eighteen is the wall length, 81 is half the wall, and 162 is the whole wall.2025 CBC §716.3.2.1.2

Which adhesive type does the mirror bulletin direct installers to use when adhesive is necessary?

• a.Any fast-curing adhesive
• b.Adhesive containing acetone
• c.Acid-cure adhesive
• d.Neutral-cure adhesive✓

The bulletin calls for neutral-cure adhesives. Adhesive containing acetone is a strong solvent that attacks mirror backings, acid-cure adhesive releases acetic acid that does the same, and a fast cure is not a criterion because some fast-curing products are acid-cure.GANA MD 03-0709 Mirror installation bulletin (2009)

What minimum space does the mirror bulletin say to leave under the bottom edge of a mirror?

• a.10 mm✓
• b.100 mm
• c.1 mm
• d.3 mm

The bulletin insists on at least 10 mm between the bottom edge of a mirror and other surfaces for drainage. Three millimeters and 1 mm trap moisture, and 100 mm is far more than the minimum the bulletin asks for.GANA MD 03-0709 Mirror installation bulletin (2009)

May mirrors be installed on a freshly painted wall?

• a.Yes, right away while the paint is wet
• b.Yes, if the mirror is taped to the wall
• c.Not until the paint is dry or sealed✓
• d.Yes, if the room is kept closed up tight

The bulletin says never to install mirrors on new plaster, new masonry or a freshly painted wall until dried or properly sealed, because airborne solvents attack the silver. Taping or closing the room does not help.GANA MD 03-0709 Mirror installation bulletin (2009)

A skylight on a store roof is set at an angle of 30 degrees from horizontal. How is it mounted under the Building Code?

• a.On a curb that is 1 inch high
• b.On a curb that is 12 inches high
• c.On a curb at least 4 inches high✓
• d.Flush with the roof plane, with no curb

Skylights at an angle less than 45 degrees from horizontal are mounted not less than 4 inches above the roof plane on a curb. Flush and 1-inch mounting are too low, and 12 inches is not the code figure.2025 CBC §2405.4

What are the mesh and distance limits for a broken-glass retention screen under sloped glazing?

• a.Mesh of 1/8 inch, within 1/2 inch of the glass
• b.Mesh of 3 inches, within 12 inches of the glass
• c.Mesh of 1 inch or less, within 4 inches of the glass✓
• d.Mesh of 2 inches, within 6 inches of the glass

The screen has mesh not larger than 1 by 1 inch, is installed within 4 inches of the glass and supports twice the weight of the glazing. The other pairs are not the code values.2025 CBC §2405.3

What interlayer thickness does the code require for monolithic laminated sloped glazing?

• a.A 5-mil polyvinyl butyral layer
• b.A 1/2-inch interlayer of clear plastic
• c.A minimum 30-mil polyvinyl butyral layer✓
• d.No interlayer, since the plies are tempered

Laminated monolithic sloped glazing has a minimum 30-mil PVB or equivalent interlayer. Five mils is too thin, an interlayer is required, and half an inch is not the figure.2025 CBC §2405.2

How many glass balusters must support the top rail of a guard with structural glass balusters?

• a.Only two balusters
• b.Not fewer than ten
• c.Only one baluster
• d.Not fewer than three✓

The top rail is supported by not fewer than three glass balusters, or otherwise supported to stay in place if one fails. One or two are not enough, and ten is not required.2025 CBC §2407.1.2

What glass is required for fire department access panels?

• a.Tempered glass✓
• b.Wired glass
• c.Annealed glass
• d.Heat-strengthened glass

Fire department glass access panels must be tempered, and in multipanel assemblies all panes are tempered. Annealed, heat-strengthened and wired glass do not qualify.2025 CBC §2406.5

What glass is required in elevator hoistway enclosures and hoistway doors?

• a.Annealed glass
• b.Patterned glass
• c.Laminated glass✓
• d.Wired glass

The code requires laminated glass meeting ANSI Z97.1 or CPSC 16 CFR 1201 in hoistway enclosures and doors. Annealed, patterned and wired glass do not qualify.2025 CBC §2409.2

At what height above the playing surface are impacts applied in racquetball court glass testing?

• a.59 inches✓
• b.12 inches
• c.24 inches
• d.96 inches

The code applies impacts at a height of 59 inches above the playing surface. Twelve and 24 inches are too low, and 96 inches is above a typical wall.2025 CBC §2408.2.1

A joint is 5/8 inch wide. Which is the smallest listed backer rod diameter that is at least 25 percent larger?

• a.3/4 inch
• b.1/2 inch
• c.5/8 inch
• d.13/16 inch✓

The minimum is 0.625 × 1.25 = 0.78 inch, so 13/16 inch (0.8125) is the smallest listed that qualifies. A 5/8-inch rod equals the joint, 3/4 inch is only 20 percent larger, and 1/2 inch is smaller than the joint.UFGS 08 81 00

What does a closed-cell backer rod or bond breaker accomplish in a joint?

• a.Lets sealant bond to all three sides
• b.Takes the place of the sealant
• c.Makes the finished joint rigid
• d.Keeps sealant bonded on two sides✓

Backer rod or bond breaker ensures the sealant adheres to two sides of a three-sided joint so it can stretch. It does not make the joint rigid, three-sided adhesion is what it prevents, and it does not replace the sealant.NIH DRM News to Use, Sealant Joints Part 2 (2021)

A perimeter joint is 1 inch wide. What does the bulletin require?

• a.A larger backer rod only
• b.A deeper bead to span the wide joint
• c.A thinner bead of sealant across the joint
• d.A flashing to reduce the exposed width✓

Where joint width exceeds 3/4 inch, a flashing reduces the exposed width. A larger rod alone does not reduce the exposed width, a deeper bead makes the sealant work harder across the wider gap, and a thinner bead does not narrow the joint.NIH DRM News to Use, Sealant Joints Part 2 (2021)

A joint is 1/2 inch wide. Under the 2:1 ratio of joint width to backer rod setback, what is the setback?

• a.1/4 inch✓
• b.3/8 inch
• c.1/2 inch
• d.1 inch

A 2:1 ratio gives a setback of 1/4 inch. A 1/2-inch setback is a 1:1 ratio, 1 inch is a 1:2 ratio, and 3/8 inch is the maximum, not the 2:1 result.NIH DRM News to Use, Sealant Joints Part 2 (2021)

How is a finished sealant surface shaped?

• a.Tooled flush to slightly concave✓
• b.Built up into a dome above the joint
• c.Scored down the middle with a knife
• d.Left rough, as it came off the gun

The bulletin says to tool flush to slightly concave for a smooth continuous joint. Rough, domed and scored surfaces trap water and weaken adhesion.NIH DRM News to Use, Sealant Joints Part 2 (2021)

Which joint condition does the bulletin say to avoid in design and detailing?

• a.Coplanar gapped joints with closed-cell backer rod
• b.Joints with a flashing at wide gaps
• c.Joints that are tooled to a concave shape
• d.Coplanar abutting joints✓

Coplanar abutting joints leave inadequate room for a sealant joint and should be avoided. The other conditions are recommended practice.NIH DRM News to Use, Sealant Joints Part 2 (2021)

In what condition must glass be when the federal guide specification says work is accepted?

• a.Covered with protective film
• b.Dirty but intact
• c.Labeled with all construction labels
• d.Clean✓

The specification says glass must be clean at the time the work is accepted, with labels, paint spots and putty removed. Dirty, film-covered or fully labeled glass is not accepted.UFGS 08 81 00

How should protective material be placed over reflective glass?

• a.Spaced off the coating so air can move✓
• b.Glued directly to the coated glass surface
• c.Taped tightly against the coated surface
• d.Left off because glass needs no protection

The specification calls for protective material far enough from the coated glass to allow air to circulate. Tight tape and glue contaminate the coating, and protection is required.UFGS 08 81 00

A lite is chipped during construction. What does the guide specification require?

• a.Replace it with a new unit✓
• b.Polish the chip
• c.Leave it if the chip is small
• d.Fill the chip with sealant

The specification requires removing and replacing glass units that are broken, chipped, cracked, abraded or otherwise damaged during construction. Polishing leaves the damaged unit in place, filling the chip with sealant hides the break origin, and leaving a small chip ignores that chipped glass is on the list.UFGS 08 81 00

What is used to mark glazed openings after installation under the guide specification?

• a.Permanent paint rolled across the glass
• b.Dust and marks left on the glass from the work
• c.Tape or flags attached with non-staining adhesive✓
• d.A sign posted at the door of the building

The specification calls for warning tapes or flags attached with non-staining adhesives. Permanent paint damages the glass, a sign at the building door does not mark the openings themselves, and leftover dust is neither a deliberate marking nor easy to remove.UFGS 08 81 00

Why is glass near welding protected?

• a.Welding adds weight to the lite
• b.Sparks can damage the glass surface✓
• c.Welding seals the glass edges shut
• d.Welding changes the color of the glass

Sparks from welding are a cause of surface damage and degradation. The other effects are not described.Pilkington ATS-192 General glazing guidelines (2013)

What should be done with movable sash and doors until glazing compound has set?

• a.Operate them often to test the fit of the hardware
• b.Remove them from the building until later
• c.Fix them or keep them closed and locked✓
• d.Leave them open for good airflow

The specification says to fix movable items or keep them closed and locked until the compound has thoroughly set. Opening, cycling and removal disturb the compound.UFGS 08 81 00