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

Which contract document states the standard each glass product must meet and how it is installed?

• a.The site survey
• b.The floor plans
• c.The specifications✓
• d.The bid tabulation

The specifications carry the written requirements for products, standards and installation. Floor plans show locations, a site survey records the lot, and a bid tabulation compares prices.CSLB C-17 study guide 13E-17 (evaluating plans and specifications)

A bidder discovers after bidding that an addendum changed the glass type for a storefront. What is the likely result?

• a.The bid is automatically corrected
• b.The change is ignored by the owner
• c.The addendum applies only to later bidders
• d.The bid priced the wrong glass✓

Addenda change the documents during bidding, and a bid that ignores one prices a different job. Bids are not corrected automatically, addenda apply to every bidder, and the owner relies on the revised documents.CSLB C-17 study guide 13E-17 (evaluating plans and specifications)

What is the purpose of a shop drawing for a glazing package?

• a.To record the final cleaning schedule for the project
• b.To take the place of the specification for the work
• c.To show lite sizes, glass makeup, anchors and joint details✓
• d.To list the owner's insurance and bonding limits

Shop drawings are prepared by the contractor or frame maker and show the actual sizes, makeups, anchors and joints before fabrication. They do not replace the specification, and cleaning schedules and insurance are separate items.CSLB C-17 study guide 13E-17 (evaluating plans and specifications)

A specification allows "or equal" products. What must the contractor do before installing a substitute?

• a.Submit the substitute and get acceptance✓
• b.Label it with the brand name that was specified
• c.Install it first and wait to hear of any complaint
• d.Tell only the glass supplier about the change

An equal product still goes through submittal and acceptance before it is installed. Installing it first and waiting for complaints skips that review, telling only the supplier leaves the design team uninformed, and labeling it with the specified brand misstates what is in the wall.CSLB C-17 study guide 13E-17 (evaluating plans and specifications)

A double-glazed unit has a low-e coating on surface 3. On which face is it?

• a.The weather face of the outer lite
• b.The air-space face of the inner lite✓
• c.The air-space face of the outer lite
• d.The room face of the inner lite

Surfaces count from outside, so surface 3 is the face of the inner lite that looks at the air space. Surface 1 is the weather face, surface 2 is the air-space face of the outer lite, and surface 4 is the room face.Guardian Glass IGU brochure; 2025 Energy Code residential compliance manual Ch. 3

How many glass surfaces does a triple-glazed unit have?

• a.Eight
• b.Four
• c.Three
• d.Six✓

Each of three lites has two faces, so there are six surfaces numbered from the exterior inward. Three counts lites, four is a double-glazed unit's count, and eight has no basis.Guardian Glass IGU Expert Series brochure (2020)

On which surfaces may a low-e coating be applied in a double- or triple-glazed unit?

• a.Only the room-side surface of the inner lite
• b.The second, third or fourth surfaces✓
• c.Only the first surface, facing the outdoors
• d.Any surface, including those inside the spacer

The Energy Commission says low-e coatings are applied to the second, third or fourth surfaces. The first surface is exposed to weather, and the spacer is not a glass surface.2025 Energy Code residential compliance manual, Ch. 3

Which description fits laminated glass?

• a.A single lite that carries a fired ceramic pattern
• b.Two lites that are separated by a sealed air space
• c.A single lite that is heated and cooled quickly
• d.Two or more lites bonded to a plastic interlayer✓

Laminated glass is made of two or more pieces of glass bonded to an intervening layer of resilient plastic. Rapid heating and cooling describes tempering, a sealed air space describes an insulating unit, and a frit describes a printed lite.16 CFR 1201.2(a)(13)

Approximately how much stronger than annealed glass of the same thickness is fully tempered glass, by the industry rule of thumb?

• a.About ten times
• b.About the same
• c.About four times✓
• d.About one and a half times

The rule of thumb is that fully tempered glass has about four times the breakage strength of annealed glass, and heat-strengthened about twice. Equal strength, 1.5 times and ten times are not the rule.GANA FB45-14 Recommended Applications for Heat-Treated Glass (2019)

Which statement is correct about heat-strengthened glass?

• a.It is not safety glazing unless laminated✓
• b.It qualifies as safety glazing in every kind of door
• c.It can be cut to size after the heat treatment
• d.It is weaker than annealed glass of the same thickness

Heat-strengthened glass tends to stay in the frame when broken but is not safety glazing unless laminated. It is stronger than annealed glass, and heat-treated glass cannot be cut after treatment.GANA FB45-14 Recommended Applications for Heat-Treated Glass (2019)

A unit is made of two 1/4-inch lites laminated together and installed in one frame. How does the Energy Commission treat it?

• a.It is not double-pane glazing✓
• b.It counts as double-pane glazing for compliance
• c.It is classed with skylights and sloped glazing
• d.It counts as triple-pane glazing for compliance

Two panes of glazing laminated together do not constitute double-pane glazing, since double-pane requires lites separated by a space. It is not triple-pane, and orientation in the wall does not make it a skylight.2025 Energy Code residential compliance manual, Ch. 3

Which glass may be identified by a removable paper marking under the Building Code?

• a.Tempered glass in a door
• b.Fire-rated glass in a corridor
• c.Laminated glass in a guard
• d.Tempered spandrel glass✓

The code allows tempered spandrel glass to carry a removable paper marking from the manufacturer. Tempered glass in a door needs a permanent mark, and guards and rated glazing have their own marking rules.2025 CBC §2403.1

A fixed lite beside a door in a store has a bottom edge 62 inches above the floor. Under the Building Code, is it a hazardous location adjacent to the door?

• a.Yes, since the lite is within 24 inches of the door
• b.No, since fixed lites are never hazardous locations
• c.No, since the bottom edge is not under 60 inches✓
• d.Yes, since the building is a retail store occupancy

Glazing next to a door is hazardous only if its bottom edge is less than 60 inches above the walking surface, and 62 is not less than 60. Distance alone does not decide it, building use is not the test, and fixed lites can be hazardous when the conditions are met.2025 CBC §2406.4.2

A specification calls for safety glazing in a location where the code does not require it. Which controls?

• a.Neither of them, since the two documents conflict
• b.The specification, which may be stricter than the code✓
• c.Whichever of the two costs the contractor less
• d.The code, which bars any stricter requirements

The code sets a minimum, and a specification can require more, so the contract specification governs. Codes do not prohibit stricter requirements, the two do not conflict, and price is not the test.CSLB C-17 study guide 13E-17 (evaluating plans and specifications)

What does the federal guide specification say determines the sizes that give the required edge clearances?

• a.Reading the dimension printed on the drawing
• b.Measuring the actual opening for the glass✓
• c.Using the cut list from the previous similar job
• d.Adding 1/2 inch to the size in the frame schedule

The specification says to determine sizes by measuring the actual opening. Drawing dimensions, a past cut list and a flat allowance ignore real variation.UFGS 08 81 00

By signing the affidavit that lets pane identification be omitted, what does the glazing contractor certify?

• a.That each light is glazed to the approved documents✓
• b.That the glass was bought at the lowest cost
• c.That the building official has inspected every light
• d.That the owner has already accepted all of the work

The affidavit certifies that each light is glazed in accordance with approved construction documents. Cost, owner acceptance and an inspection are not what it states.2025 CBC §2403.1

What is a request for information (RFI) used for on a glazing project?

• a.To report a worker's injury to the state agency
• b.To ask the inspector to schedule a final inspection
• c.To settle a conflict or gap in the documents in writing✓
• d.To order the glass from the supplier on a rush basis

An RFI resolves conflicts and unclear items in writing so the record is clear. Ordering glass is a purchasing step, a worker's injury is reported to the state agency through its own report, and a final inspection is requested from the inspector directly.CSLB C-17 study guide 13E-17 (evaluating plans and specifications)

Which material is named in the C-17 definition as a glazing material alongside glass and mirrored glass?

• a.Gypsum board for interior partitions
• b.Roofing membrane for low-slope roofs
• c.Structural steel used in building frames
• d.Glass substitute materials for glazing✓

The definition names "glass substitute materials for glazing," which covers rigid plastic glazing. Steel, roofing and gypsum board are materials of other classes.CSLB C-17 classification text (16 CCR Division 8, Article 3)

An elevation is drawn at 1/2 inch = 1 foot. A header measures 7-3/8 inches on the drawing. What is its real length?

• a.1 foot 10-1/8 inches
• b.7 feet 4-1/2 inches
• c.14 feet 9 inches✓
• d.3 feet 8-11/16 inches

At 1/2 inch to the foot one drawing inch is 2 feet, so 7.375 × 2 = 14.75 feet, which is 14 feet 9 inches. Dividing by two gives 3.69, dividing by four gives 1 foot 10-1/8 inches, and 7 feet 4-1/2 inches reads the drawing as full size feet.CSLB C-17 study guide 13E-17 (evaluating plans and specifications)

A detail at 3/16 inch = 1 foot shows a wall bay 2-1/4 inches wide. What is the real width?

• a.24 feet
• b.12 feet✓
• c.27 feet
• d.18 feet

At 3/16 inch to the foot one drawing inch is 5-1/3 feet, so 2.25 × 5.333 = 12 feet. 24 feet uses a 3/32-inch scale, 18 feet uses a 1/8-inch scale and 27 feet reads the drawing as 1 inch to the foot.CSLB C-17 study guide 13E-17 (evaluating plans and specifications)

Which statement about the U-factor of a window is correct?

• a.It measures only the center of the glass
• b.A higher value means a more efficient product
• c.It covers glass, edge and frame losses together✓
• d.It is the same number as visible transmittance

The U-factor considers the entire product, including center of glass, glass edge, frame and mullions. It is not limited to the glass center, a lower value is more efficient, and visible transmittance is a separate rating of light.2025 Energy Code residential compliance manual, Ch. 3

What does visible transmittance (VT) express?

• a.The share of visible light passing through the product✓
• b.The amount of ultraviolet light that is reflected
• c.The rate at which heat flows through the frame
• d.The fraction of the sun's heat that is admitted

VT is the ratio of visible light transmitted through the fenestration. Heat flow is the U-factor, solar heat admitted is the SHGC, and ultraviolet reflection is not the VT definition.2025 Energy Code residential compliance manual, Ch. 3

A lite is 28-1/2 inches by 46 inches. About how many square feet is that?

• a.18.2 square feet
• b.9.1 square feet✓
• c.1,311 square feet
• d.149 square feet

28.5 × 46 = 1,311 square inches, and 1,311 ÷ 144 = 9.1 square feet. The 1,311 is the unconverted area, 149 is the perimeter in inches, and 18.2 is double the correct area.CSLB C-17 study guide 13E-17 (job-related calculations)

A lite is 1,200 mm by 2,000 mm. Using 1 square meter = 10.76 square feet, about how many square feet is it?

• a.2.58 square feet
• b.2.4 square feet
• c.25.8 square feet✓
• d.3.2 square feet

The area is 1.2 × 2.0 = 2.4 square meters, and 2.4 × 10.76 = 25.8 square feet. The 2.4 is the area in square meters, 2.58 shifts the decimal, and 3.2 is the sum of the sides in meters.CSLB C-17 study guide 13E-17 (job-related calculations)

A storefront has twelve identical lites, each 24 inches by 36 inches. How many square feet of glass is that in all?

• a.864 square feet
• b.72 square feet✓
• c.10,368 square feet
• d.144 square feet

Each lite is 24 × 36 ÷ 144 = 6 square feet, so twelve lites are 72. The 864 is square inches for one lite times twelve with no conversion, 10,368 is square inches for all twelve, and 144 doubles each lite's area.CSLB C-17 study guide 13E-17 (job-related calculations)

A round lite has a diameter of 30 inches. What is its area, using pi = 3.14?

• a.About 9.8 square feet
• b.About 6.5 square feet
• c.About 19.6 square feet
• d.About 4.9 square feet✓

The radius is 15 inches, the area is 3.14 × 225 = 706.5 square inches, and 706.5 ÷ 144 = 4.9 square feet. The 9.8 doubles the result, 19.6 uses the diameter in place of the radius, and 6.5 has no basis.CSLB C-17 study guide 13E-17 (job-related calculations)

A storefront has five bays. Each bay has a lower lite 40 by 60 inches and a transom lite 40 by 24 inches. How many square feet of glass is in the storefront?

• a.83.3 square feet
• b.33.3 square feet
• c.23.3 square feet
• d.116.7 square feet✓

Each bay is (2,400 + 960) ÷ 144 = 23.3 square feet, and five bays make 116.7. The 83.3 counts only the lower lites, 33.3 only the transoms, and 23.3 only one bay.CSLB C-17 study guide 13E-17 (job-related calculations)

A 36-by-60-inch mirror is priced at $14 per square foot. What is the price of the mirror?

• a.$420
• b.$840
• c.$210✓
• d.$30,240

The mirror is 36 × 60 ÷ 144 = 15 square feet, and 15 × $14 = $210. The $30,240 multiplies the square inches by the price, $840 uses 60 square feet, and $420 prices both faces.CSLB C-17 study guide 13E-17 (job-related calculations)

A lite is 30 by 54 inches. What is its perimeter in feet?

• a.11.25 feet
• b.1.4 feet
• c.7 feet
• d.14 feet✓

The perimeter is 2 × (30 + 54) = 168 inches, which is 14 feet. The 1.4 shifts the decimal, 7 feet is half the perimeter, and 11.25 is the area in square feet.CSLB C-17 study guide 13E-17 (job-related calculations)

Ten lites of 48 by 72 inches are sealed on all four sides at both faces. How many lineal feet of sealant joint is that?

• a.4,800 feet
• b.800 feet
• c.200 feet
• d.400 feet✓

One lite has a 240-inch perimeter, 20 feet, so ten lites are 200 feet per face and 400 feet for two faces. The 200 counts one face, 4,800 is inches, and 800 doubles the count twice.CSLB C-17 study guide 13E-17 (job-related calculations)

An opening 6 feet by 8 feet is sealed around its perimeter on one face. How many lineal feet of sealant is that?

• a.28 feet✓
• b.96 feet
• c.56 feet
• d.48 feet

The perimeter is 2 × (6 + 8) = 28 feet. The 48 is the area, 96 doubles the area, and 56 counts the opening twice.CSLB C-17 study guide 13E-17 (job-related calculations)

A joint is 1/2 inch wide, 1/4 inch deep and 75 feet long. A cartridge delivers 20 cubic inches. How many cartridges, rounded up?

• a.6 cartridges✓
• b.1 cartridge
• c.5 cartridges
• d.3 cartridges

The cross-section is 0.125 square inch, the length is 900 inches, the volume is 112.5 cubic inches, and 112.5 ÷ 20 = 5.6, rounded up to 6. Five rounds down, 3 uses a 1/8-inch depth, and 1 forgets the feet to inches conversion.CSLB C-17 study guide 13E-17 (job-related calculations)

A bead is 3/8 inch wide and 3/8 inch deep and runs 20 feet. What volume of sealant is that?

• a.About 17 cubic inches
• b.About 2.8 cubic inches
• c.About 0.14 cubic inch
• d.About 33.8 cubic inches✓

The cross-section is 0.1406 square inch, the length is 240 inches, and the volume is 33.75 cubic inches. The 2.8 uses feet instead of inches, 0.14 is only the cross-section, and 17 halves the answer.CSLB C-17 study guide 13E-17 (job-related calculations)

A 600-foot joint is 1/4 inch wide and 1/4 inch deep. A cartridge delivers 18 cubic inches and the allowance is 10 percent. How many cartridges, rounded up?

• a.14 cartridges
• b.25 cartridges
• c.27 cartridges
• d.28 cartridges✓

The volume is 0.0625 × 7,200 = 450 cubic inches, which is 25 cartridges, and with 10 percent the need is 27.5, rounded up to 28. Twenty-five leaves out the allowance, 27 rounds down, and 14 halves the volume.CSLB C-17 study guide 13E-17 (job-related calculations)

A lite is 72 by 96 inches in a metal system. How long is each setting block at 0.1 inch per square foot?

• a.4.8 inches✓
• b.48 inches
• c.7.2 inches
• d.9.6 inches

The lite is 48 square feet and 0.1 × 48 = 4.8 inches, above the 4-inch minimum. 7.2 inches treats the lite as 72 square feet, 48 confuses area with length, and 9.6 doubles the result.Pilkington ATS-192 General glazing guidelines (2013)

A lite is 40 by 60 inches. What setting block length applies, with a 4-inch minimum?

• a.16.7 inches
• b.8 inches
• c.4 inches✓
• d.1.7 inches

The area is 16.7 square feet and the formula gives 1.7 inches, but the minimum is 4 inches, so 4 controls. The 1.7 ignores the minimum, 16.7 is the area, and 8 doubles the minimum.Pilkington ATS-192 General glazing guidelines (2013)

A lite is 96 inches wide. Where are the setting blocks centered, measured from one vertical edge?

• a.48 inches only
• b.24 inches and 72 inches✓
• c.12 inches and 84 inches
• d.32 inches and 64 inches

The quarter points of 96 inches are at 24 and 72 inches. A block at 48 inches is the center, 12 and 84 are an eighth of the width from each edge, and 32 and 64 are thirds.Pilkington ATS-192 General glazing guidelines (2013)

A lite is 120 inches wide and the quarter points cannot be used. By the glass manufacturer's alternative, the end of a block may be moved within what distance of the vertical edge?

• a.12 inches
• b.15 inches✓
• c.6 inches
• d.10 inches

The distance is the greater of 6 inches or 1/8 of the width, and 120 ÷ 8 = 15 inches is greater. Six inches is the smaller figure, and 10 inches and 12 inches are not rule values.Pilkington ATS-192 General glazing guidelines (2013)

A daylight opening is 72 inches wide. A storefront manufacturer cuts the gasket to the daylight opening plus 1/4 inch per foot. How long is the gasket?

• a.78 inches
• b.72 inches
• c.73-1/2 inches✓
• d.72-1/4 inches

The opening is 6 feet, so the allowance is 6 × 1/4 = 1-1/2 inches, giving 73-1/2 inches. The exact length leaves no allowance, 78 inches adds an inch per foot, and 72-1/4 adds only 1/4 inch in total.YKK AP storefront weathering/sealant checklist 02-4100-05

A daylight opening is 36 by 60 inches. Using the daylight opening plus 1/4 inch per foot for each side, how many inches of gasket does the whole perimeter take?

• a.192 inches
• b.188 inches
• c.98 inches
• d.196 inches✓

The 36-inch sides are cut 36.75 and the 60-inch sides 61.25, so 2 × (36.75 + 61.25) = 196 inches. The 192 inches is the perimeter with no allowance, 98 is half, and 188 subtracts the allowance instead of adding it.YKK AP storefront weathering/sealant checklist 02-4100-05

A 3/8-inch lite measures 36 square feet. Using 13 pounds per square foot per inch of thickness, how much does it weigh?

• a.About 58 pounds
• b.About 117 pounds
• c.About 175 pounds✓
• d.About 88 pounds

13 × 0.375 = 4.875 pounds per square foot, and 4.875 × 36 = 175.5 pounds. The 58 uses an eighth inch, 117 uses a quarter inch, and 88 halves it.2025 CBC §2404.2

An insulating unit has two 1/4-inch lites and a 1/2-inch air space and measures 4 feet by 6 feet. About how much does it weigh?

• a.About 468 pounds
• b.About 312 pounds
• c.About 156 pounds✓
• d.About 234 pounds

The glass thickness is 1/2 inch, so 13 × 0.5 × 24 = 156 pounds, and the air space adds nothing. The 312 counts the 1-inch overall thickness as glass, 468 uses 1-1/2 inches of glass, and 234 uses 3/4 inch.2025 CBC §2404.2

A laminated lite of two 1/4-inch plies is 5 feet by 8 feet. Ignoring the thin interlayer, about how much does it weigh?

• a.About 325 pounds
• b.About 520 pounds
• c.About 260 pounds✓
• d.About 650 pounds

The area is 40 square feet and 13 × 0.5 × 40 = 260 pounds. The 650 uses 1-1/4 inches of glass, 520 doubles the answer, and 325 uses 5/8 inch of glass.2025 CBC §2404.2

What does 3/4-inch glass weigh per square foot using the code formula?

• a.9.75 pounds✓
• b.19.5 pounds
• c.26 pounds
• d.13 pounds

13 × 0.75 = 9.75 pounds per square foot. Thirteen is the figure for a full inch, 26 is the figure for two inches, and 19.5 is the figure for an inch and a half.2025 CBC §2404.2

A daylight opening is 22-3/4 by 40-1/4 inches and the bite is 3/8 inch on each side. What is the glass size?

• a.23-1/8 by 40-5/8 inches
• b.23-1/2 by 41 inches✓
• c.22-3/4 by 40-1/4 inches
• d.24-1/4 by 41-3/4 inches

The glass grows by two bites of 3/8 inch, or 3/4 inch in each direction, giving 23-1/2 by 41. The unchanged size ignores the bite, 23-1/8 by 40-5/8 adds one bite, and 24-1/4 by 41-3/4 adds 1-1/2 inches.CSLB C-17 study guide 13E-17 (job-related calculations)

A daylight opening is 59 by 83 inches with a 1/2-inch bite on each side. What is the glass size?

• a.60 by 84 inches✓
• b.59-1/2 by 83-1/2 inches
• c.61 by 85 inches
• d.59 by 83 inches

Two 1/2-inch bites add 1 inch to each dimension. The unchanged size ignores the bite, 59-1/2 by 83-1/2 adds only one bite, and 61 by 85 adds two inches.CSLB C-17 study guide 13E-17 (job-related calculations)

A daylight opening is 35-1/8 by 47-7/8 inches and the bite is 5/16 inch on each side. What is the glass size?

• a.36-3/8 by 49-1/8 inches
• b.35-3/4 by 48-1/2 inches✓
• c.35-7/16 by 48-3/16 inches
• d.35-1/8 by 47-7/8 inches

Two 5/16-inch bites add 5/8 inch to each dimension, so 35.125 + 0.625 = 35.75 and 47.875 + 0.625 = 48.5. The unchanged size ignores the bite, 35-7/16 by 48-3/16 adds one bite, and 36-3/8 by 49-1/8 adds 1-1/4 inches.CSLB C-17 study guide 13E-17 (job-related calculations)

Net glass is 480 square feet and the waste allowance is 7 percent. What quantity is ordered?

• a.513.6 square feet✓
• b.446.4 square feet
• c.33.6 square feet
• d.480 square feet

480 × 1.07 = 513.6 square feet. The 33.6 is only the waste, 446.4 subtracts the waste, and 480 ignores waste.CSLB C-17 study guide 13E-17 (job-related calculations)

A job needs 32 cartridges net and the allowance is 5 percent. How many cartridges are bought?

• a.37 cartridges
• b.34 cartridges✓
• c.33 cartridges
• d.32 cartridges

32 × 1.05 = 33.6, and cartridges are bought whole, so 34. Thirty-three rounds down, 32 ignores the allowance, and 37 adds 15 percent.CSLB C-17 study guide 13E-17 (job-related calculations)

Net glass is 1,100 square feet, stock sheets are 5 by 10 feet and waste is 10 percent. How many sheets are ordered?

• a.27 sheets
• b.25 sheets✓
• c.24 sheets
• d.22 sheets

With waste the need is 1,210 square feet and 1,210 ÷ 50 = 24.2, rounded up to 25. Twenty-two ignores waste, 24 rounds down, and 27 adds 20 percent.CSLB C-17 study guide 13E-17 (job-related calculations)