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Red Seal Glazier practice questions

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Question 1Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

In a commercial storefront, what is the primary purpose of setting the glass in a glazing channel with a resilient gasket rather than rigid bedding compound?

  1. To increase the dead load transferred to the sill
  2. To allow controlled movement of the glass within the frame under wind and thermal loads Correct answer.
  3. To eliminate the need for edge clearance
  4. To permanently seal the glass so no movement is possible

Explanation

Resilient glazing accommodates expansion, contraction, and building deflection so the glass is not stressed against a rigid frame. Rigid bedding with no allowance for movement can induce edge stress and cracking.

Question 2Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

Which glass product is produced by rapidly cooling molten glass so it develops a compressive surface stress and, when broken, fractures into small granular pieces?

  1. Heat-strengthened glass
  2. Fully tempered glass Correct answer.
  3. Laminated glass
  4. Annealed float glass

Explanation

Tempering creates high surface compression and a characteristic dicing fracture pattern that is safer in overhead and door applications. Heat-strengthened glass has lower surface compression and breaks into larger shards.

Question 3Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a laminated glass panel in a school corridor where the glass must remain in the opening after breakage. Which property of the interlayer is most relevant to this requirement?

  1. Its ability to eliminate the need for edge clearance
  2. Its ability to increase the visible light transmittance
  3. Its ability to hold glass fragments together and resist fallout Correct answer.
  4. Its ability to reduce the panel's weight

Explanation

The interlayer bonds the glass plies so that broken fragments stay adhered, providing residual integrity and reducing injury from falling shards. Light transmittance, weight, and edge clearance are unaffected by this function.

Question 4Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

When installing insulating glass units (IGUs) in a curtain wall, what is the purpose of the capillary tube or breather tube in some units?

  1. To allow pressure equalization during transport and installation at altitude changes Correct answer.
  2. To inject desiccant into the spacer
  3. To vent the interior building air into the cavity
  4. To drain condensation from the sealed cavity permanently

Explanation

Breather tubes equalize pressure differences between the sealed cavity and the atmosphere during shipping and altitude changes, and are sealed after installation. They are not intended to drain condensation or to connect the cavity to the building interior.

Question 5Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier must set a heavy monolithic glass panel into a storefront frame. Where should setting blocks be placed?

  1. At the head of the frame only
  2. Along the full length of the sill to distribute load
  3. At the quarter points of the sill, centered under the glass
  4. At the lower corners, each set in from the edge by at least the glass thickness Correct answer.

Explanation

Setting blocks are located near the lower corners, inset from the edges by at least the glass thickness, to transfer weight to the frame while avoiding edge contact. They should not bear on the extreme edge or be placed at the head.

Question 6Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

In a fire-rated glazing application, which characteristic distinguishes fire-resistive glazing from fire-protective glazing?

  1. Fire-protective glazing must be laminated
  2. Fire-resistive glazing blocks radiant heat transfer in addition to limiting flames and smoke Correct answer.
  3. Fire-resistive glazing is only used in exterior walls
  4. Fire-protective glazing is always tempered glass

Explanation

Fire-resistive glazing limits temperature rise on the unexposed side, restricting radiant heat transfer, while fire-protective glazing limits flames and smoke but allows heat transmission. This distinction affects where each product may be used in rated assemblies.

Question 7Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a frameless glass shower enclosure. Which glass type is most appropriate for safety in this wet, occupied area?

  1. Fully tempered glass Correct answer.
  2. Wire mesh glass
  3. Heat-strengthened glass
  4. Annealed glass with polished edges

Explanation

Tempered glass is required in hazardous locations such as shower enclosures because it breaks into small granular pieces rather than large shards. Heat-strengthened and annealed glass do not provide the same safety fracture pattern.

Question 8Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

What is the function of a weep hole or drainage slot in a storefront glazing system?

  1. To permit air infiltration for ventilation
  2. To allow the glass to expand freely
  3. To allow water that enters the glazing pocket to drain to the exterior Correct answer.
  4. To provide a path for sealant injection

Explanation

Weep holes and drainage slots allow water that penetrates the glazing pocket to exit, preventing standing water and water damage. They are not ventilation openings or sealant access points.

Question 9Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

When installing a butt-glazed vertical joint with structural silicone, what is the primary role of the structural silicone sealant?

  1. To fill the joint for appearance
  2. To provide weather sealing only
  3. To act as a setting block for the glass
  4. To transfer wind and dead loads between glass panels and the frame Correct answer.

Explanation

Structural silicone is engineered to transfer loads between the glass and the supporting frame or adjacent panels. Weather sealants and setting blocks serve different functions and cannot substitute for structural adhesion.

Question 10Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is cutting annealed float glass by scoring and breaking. What is the purpose of applying a light oil or cutting fluid along the score line?

  1. To clean the glass surface
  2. To increase the glass's surface compression
  3. To cool the cutter wheel
  4. To lubricate the score and help the crack propagate cleanly Correct answer.

Explanation

Cutting fluid lubricates the score line and helps the median crack propagate cleanly during breaking. It does not alter the glass's residual stress or serve as a cleaning step.

Question 11Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

In a commercial curtain wall, what is the purpose of an edge block (also called a spacer or anti-walk block) in a glazing pocket?

  1. To support the glass weight at the sill
  2. To seal the glazing pocket against water
  3. To provide fire stopping
  4. To center the glass in the pocket and prevent it from walking or contacting the frame Correct answer.

Explanation

Edge blocks center the glass within the pocket and maintain edge clearance, preventing glass-to-frame contact and movement. Setting blocks carry weight, and sealants provide weather sealing.

Question 12Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a large mirrored wall in a fitness studio. Which installation method best addresses moisture and adhesion concerns in this humid environment?

  1. Mirror applied with a backing that isolates the reflective coating from moisture Correct answer.
  2. Mirror set in a frame with a continuous air space and mechanical fasteners
  3. Direct adhesive bonding of the mirror to the wall with mastic
  4. Mirror installed with no backing and sealed only at the edges

Explanation

Mirror backing or isolation protects the reflective coating from moisture and adhesive attack, which is critical in humid environments. Direct bonding with some mastics can damage the coating and cause de-silvering.

Question 13Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

What does the term 'daylight opening' (DLO) refer to in glazing work?

  1. The depth of the glazing pocket
  2. The distance from the sill to the floor
  3. The visible glass area within the frame Correct answer.
  4. The overall frame dimension including flanges

Explanation

The daylight opening is the visible glass area inside the frame, used for sizing glass and calculating vision area. Overall frame dimensions and pocket depth are separate measurements.

Question 14Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier must replace a broken pane in an existing aluminum storefront. The new glass is thicker than the original. What is the most important consideration before installation?

  1. Whether the thicker glass will eliminate the need for setting blocks
  2. Whether the thicker glass will fit within the glazing pocket with adequate edge clearance and gasket engagement Correct answer.
  3. Whether the thicker glass will change the color of the frame
  4. Whether the thicker glass will reduce the need for weep holes

Explanation

The glazing pocket, gaskets, and retainers must accommodate the thicker glass while maintaining edge clearance and proper engagement. Thickness changes also affect weight and structural performance, but fit and clearance are the immediate installation concern.

Question 15Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

Which statement correctly describes the difference between a wet glazed and a dry glazed system?

  1. Both use only structural silicone
  2. Both rely solely on compression gaskets
  3. Wet glazing uses sealant or bedding compound; dry glazing uses gaskets Correct answer.
  4. Wet glazing uses gaskets; dry glazing uses sealant

Explanation

Wet glazing relies on sealant or bedding compound to seal and bed the glass, while dry glazing uses gaskets to seal and retain the glass. The terms describe the sealing method, not the structural adhesive.

Question 16Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing tempered glass in a door lite. Why must the glass be tempered rather than annealed?

  1. Tempered glass provides a safer breakage pattern in a hazardous location Correct answer.
  2. Tempered glass is lighter in weight
  3. Tempered glass has higher visible light transmittance
  4. Tempered glass eliminates the need for a frame

Explanation

Door lites are hazardous locations where safety glazing is required; tempered glass breaks into small granular pieces that reduce injury risk. Light transmittance, weight, and framing requirements are not the reason for tempering.

Question 17Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

In an insulating glass unit, what is the purpose of the desiccant in the spacer?

  1. To provide structural support to the unit
  2. To absorb moisture from the air trapped in the sealed cavity Correct answer.
  3. To increase the thermal resistance of the cavity
  4. To bond the two glass plies together

Explanation

Desiccant absorbs residual moisture in the sealed cavity to prevent condensation and fogging between the panes. It does not bond the plies or provide structural support.

Question 18Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass railing where the glass itself acts as the guard. Which design consideration is most critical to safety?

  1. The glass type and thickness designed to resist the specified guard load Correct answer.
  2. The type of sealant used at the base
  3. The visible light transmittance
  4. The color of the glass

Explanation

When glass acts as a guard, it must be engineered for the specified lateral load, which determines the glass type and thickness. Color, sealant type, and light transmittance do not govern structural safety.

Question 19Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

What is the purpose of a glazing tape in a dry glazed system?

  1. To provide fire resistance
  2. To provide a structural bond between glass and frame
  3. To seal and cushion the glass within the glazing pocket Correct answer.
  4. To support the glass weight at the sill

Explanation

Glazing tape seals and cushions the glass within the pocket, helping to prevent water and air infiltration while protecting the glass edge. It is not a structural adhesive, setting block, or fire stop.

Question 20Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a large exterior glass panel and notices the frame is out of square. What is the most appropriate action?

  1. Measure the diagonals and correct the frame before glazing Correct answer.
  2. Install the glass with additional sealant to fill gaps
  3. Trim the glass to fit the out-of-square opening
  4. Install the glass and force it into the frame

Explanation

Forcing glass into an out-of-square frame induces stress and can cause breakage. The frame should be corrected and verified by measuring diagonals before glazing. Trimming glass or filling gaps with sealant does not correct the underlying problem.

Question 21Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

Which of the following best describes the purpose of heat-soaking tempered glass?

  1. To improve the optical clarity of the glass
  2. To increase the strength of the glass
  3. To change the color of the glass
  4. To reduce the risk of spontaneous breakage from nickel sulfide inclusions Correct answer.

Explanation

Heat-soaking exposes tempered glass to elevated temperatures to trigger breakage from nickel sulfide inclusions before installation, reducing the risk of spontaneous failure in service. It does not increase strength or alter optics or color.

Question 22Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is evaluating a curtain wall detail where the glass is captured by a pressure plate with a thermal break. What is the primary function of the thermal break?

  1. To reduce heat transfer between the exterior and interior of the frame Correct answer.
  2. To allow the glass to expand
  3. To provide a path for water drainage
  4. To increase the structural capacity of the pressure plate

Explanation

A thermal break separates the exterior and interior frame components to reduce heat conduction and improve energy performance. It does not increase structural capacity or provide drainage or movement accommodation.

Question 23Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier must determine whether a glass panel will fit within an existing glazing pocket. The pocket depth is 25 mm and the glass thickness is 12 mm. Which factor is most important to verify?

  1. That the glass is laminated
  2. That the frame is painted
  3. That the glass color matches the adjacent panels
  4. That the gasket and sealant can engage the glass with adequate bite and edge clearance Correct answer.

Explanation

The pocket must accommodate the glass plus gaskets or sealant with adequate bite and edge clearance to ensure a weathertight and structurally sound installation. Color, lamination, and paint finish do not determine fit.

Question 24Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass floor panel in a commercial atrium. Which property is most critical to the design?

  1. The type of sealant used at the edges
  2. The color of the interlayer
  3. The visible light transmittance of the glass
  4. The load-bearing capacity and safety breakage characteristics of the glass assembly Correct answer.

Explanation

Glass floors must be engineered for the specified loads and provide safe breakage behavior, often using laminated assemblies. Light transmittance, interlayer color, and edge sealant are secondary to structural safety.

Question 25Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

What is the purpose of a setting block in a glazed opening?

  1. To support the weight of the glass and prevent it from bearing on the frame edge Correct answer.
  2. To provide a structural bond between glass and frame
  3. To center the glass in the pocket
  4. To seal the glazing pocket against water

Explanation

Setting blocks transfer the glass weight to the frame and keep the glass from bearing directly on the frame edge. Centering is the role of edge blocks, and sealing is provided by gaskets or sealant.

Question 26Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is selecting glass for a street-level storefront window in a retail mall. Which glass product is designed to retain its fragments in the frame after breakage and reduce the risk of injury from falling shards?

  1. Laminated safety glass Correct answer.
  2. Heat-strengthened glass
  3. Patterned wired glass
  4. Annealed float glass

Explanation

Laminated glass contains an interlayer that bonds the glass plies together, so when it breaks the fragments stay adhered to the interlayer and remain largely in the opening. Annealed and heat-strengthened glass break into large, sharp shards, and wired glass offers no reliable retention of small fragments. This is why laminated glass is commonly specified for storefront and other risk locations.

Question 27Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is reading a shop drawing that specifies a monolithic pane of 6 mm clear glass. What does 'monolithic' indicate about this pane?

  1. It is a glass product that has been heat-soaked after tempering
  2. It is a sealed unit with a desiccant-filled spacer
  3. It is a single solid sheet of glass with no laminating or sealed cavity Correct answer.
  4. It is made of two lites bonded together with an interlayer

Explanation

Monolithic means a single, solid lite of glass with no interlayer and no sealed airspace. Laminated glass and insulating glass units are both multi-component assemblies and are described as such on drawings. Heat-soaking is a post-tempering process and does not change the monolithic description.

Question 28Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing glass into a storefront system using glazing tape. Where should the tape be positioned to perform its sealing function correctly?

  1. Applied only to the exterior face after the glass is set
  2. Centred on the face of the glass away from the frame
  3. Wrapped around the glass edge and folded onto both faces
  4. Along the glass edge where it meets the frame rebate, compressed between glass and frame Correct answer.

Explanation

Glazing tape is a pre-formed sealant bead that seals the joint between the glass edge and the frame rebate. It must sit in the rebate where the glass and frame meet so that it is compressed when the glass is set and the stops are installed. Tape placed on the open face or wrapped around the edge does not seal the glass-to-frame joint.

Question 29Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass panel into a system that uses a pressure plate and cover cap on the exterior. Which component is compressed against the glass by the pressure plate to create the weather seal?

  1. The gasket Correct answer.
  2. The setting block
  3. The weep baffle
  4. The edge block

Explanation

In a pressure-plate system, the gasket is the resilient seal that is compressed between the glass and the frame when the pressure plate is tightened. Setting blocks carry the glass weight, edge blocks control lateral position, and weep baffles manage drainage. Only the gasket performs the sealing function.

Question 30Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is asked to install a glass panel in a location where the building code requires safety glazing. Which characteristic must the glass have?

  1. It must be installed with structural silicone at all edges
  2. It must be at least 6 mm thick regardless of glass type
  3. It must be heat-strengthened rather than tempered
  4. It must be a safety glazing material that meets the required impact standard for that location Correct answer.

Explanation

Safety glazing requirements are about the glass product meeting a recognized impact standard, not simply thickness or installation method. Laminated, tempered, and certain other products can qualify when tested and labelled to the standard. Thickness alone or a particular installation method does not make glass safety glazing.

Question 31Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a large glass panel in an exterior wall and needs to allow for thermal movement of the aluminum frame. Which practice best accommodates this movement?

  1. Maintain the specified edge clearance and use resilient gaskets or sealant that can accommodate movement Correct answer.
  2. Seal the glass to the frame with a hard, non-resilient compound
  3. Set the glass tight against the frame on all four edges
  4. Use rigid setting blocks at all four corners

Explanation

Thermal movement is accommodated by leaving the designed edge clearance and using resilient materials that can deform as the frame and glass expand and contract. Setting the glass tight or using rigid materials transfers movement into the glass and can cause edge damage or breakage. The specified clearance is a design value that must be maintained during installation.

Question 32Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is working with a glass unit that has a low-emissivity coating. Which statement describes the correct handling of the coated surface?

  1. Sand the coated surface lightly to improve gasket adhesion
  2. Handle the unit according to the manufacturer's instructions, keeping the coated surface protected and clean Correct answer.
  3. Remove the coating with solvent before installation to improve adhesion
  4. Always install the coated surface facing the exterior regardless of climate

Explanation

Low-e coatings are delicate and their correct orientation and handling depend on the product and climate. Manufacturer instructions identify which surface is coated and how to protect it during handling and installation. Removing, abrading, or arbitrarily repositioning the coating can destroy its performance and void warranties.

Question 33Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a tempered glass panel and notices a small chip at the edge of the pane. What is the correct action?

  1. Install the pane and orient the chip toward the interior
  2. Grind the chip smooth and proceed with installation
  3. Install the pane and cover the chip with sealant
  4. Do not install the damaged pane; edge damage on tempered glass can cause spontaneous breakage Correct answer.

Explanation

Tempered glass is in a state of balanced internal stress, and edge damage can trigger sudden release of that stress and cause the pane to shatter. Chipped or damaged edges are a rejection criterion and the pane should not be installed. Covering or grinding the chip does not restore the edge integrity.

Question 34Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a butt-glazed vertical joint using structural silicone. Which surface preparation step is essential before applying the silicone?

  1. Prime the glass with a general-purpose paint
  2. Wipe the joint with oil to improve tooling
  3. Apply a release agent to the glass to prevent bonding
  4. Clean the glass and frame surfaces and verify adhesion with a field adhesion test Correct answer.

Explanation

Structural silicone depends on a clean, compatible surface for adhesion, and a field adhesion test confirms that the substrate, cleaner, and primer combination will bond. Release agents, paint, or oil contaminate the joint and prevent adhesion. Surface preparation and verification are the essential steps before application.

Question 35Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing an insulating glass unit in a sloped overhead application. Which feature of the unit is most important to verify before installation?

  1. That the unit uses a single seal rather than a dual seal
  2. That the unit has a clear rather than tinted glass
  3. That the unit is rated and warranted by the manufacturer for sloped or overhead use Correct answer.
  4. That the unit is the thinnest available for the opening

Explanation

Sloped and overhead glazing is subject to different structural and thermal loads, and not every insulating glass unit is warranted for that orientation. The manufacturer must confirm suitability for the application. Tint, seal type, and thickness are design choices but do not establish suitability for overhead use.

Question 36Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a frameless glass partition and must anchor the glass to the floor. Which method is commonly used to secure the bottom edge while allowing the glass to be levelled?

  1. A shoe or channel with setting blocks and grout or structural sealant Correct answer.
  2. A pressure plate bolted through the glass
  3. A bead of silicone applied only to the exterior face
  4. A single screw through the face of the glass

Explanation

A floor shoe or channel supports the glass on setting blocks and is then grouted or sealed to hold the pane while allowing levelling. Drilling or bolting through frameless glass creates stress concentrations and is generally avoided. Sealant applied only to one face does not provide a structural anchor.

Question 37Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass panel into a curtain wall and finds that the panel is slightly too large for the glazing pocket. What is the most appropriate action?

  1. Stop and report the discrepancy so the panel or pocket can be corrected to the specified dimensions Correct answer.
  2. Trim the glass edge with a grinder to fit
  3. Force the panel into the pocket and rely on the gasket to hold it
  4. Install the panel and cover the gap with sealant

Explanation

Glazing pockets and glass sizes are designed with specific clearances, and forcing an oversized panel can damage the glass edge or distort the frame. The correct action is to stop and report the discrepancy so the component can be corrected. Grinding or forcing glass is not acceptable and can lead to breakage.

Question 38Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing glass in a fire-rated corridor window. Which document should be consulted to confirm that the glazing assembly meets the required fire rating?

  1. The colour sample approved by the architect
  2. The general contractor's schedule of values
  3. The glass supplier's delivery receipt
  4. The manufacturer's listing and the project specifications identifying the rated assembly Correct answer.

Explanation

Fire-rated glazing must be installed as part of a listed assembly, and the manufacturer's listing together with the project specifications identifies the permitted components and rating. A delivery receipt, colour sample, or schedule of values does not establish fire performance. Using unlisted components can void the rating.

Question 39Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a mirror in a commercial washroom. Which backing method is appropriate to protect the mirror from moisture damage?

  1. A gap left open to the wall cavity
  2. A moisture-resistant backing or protective coating applied to the back of the mirror Correct answer.
  3. A backing of untreated paper
  4. Direct contact with the bare concrete wall

Explanation

Mirror backing protects the reflective coating from moisture and chemical attack, which is especially important in wet areas. A moisture-resistant backing or protective coating prevents the silvering from degrading. Direct contact with concrete or untreated paper can trap moisture and cause edge corrosion.

Question 40Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass handrail where the glass is captured in a metal shoe. Which factor most affects the structural performance of this assembly?

  1. The embedment depth of the glass in the shoe and the strength of the grout or clamp Correct answer.
  2. The number of weep holes in the shoe
  3. The thickness of the cover cap on the shoe
  4. The colour of the anodized finish on the shoe

Explanation

The bending capacity of a shoe-mounted glass handrail depends on how deeply the glass is embedded and how rigidly the shoe and grout or clamp restrain it. Finish colour, cover cap thickness, and weep holes do not govern structural performance. Embedment depth is a critical installation dimension.

Question 41Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass panel in an exterior wall where the design calls for a drained and vented system. What is the purpose of venting the glazing pocket?

  1. To reduce the weight of the glass panel
  2. To allow air pressure equalization and drainage of any water that enters the system Correct answer.
  3. To allow the glass to expand freely without clearance
  4. To increase the insulating value of the glass

Explanation

Drained and vented systems use vents to equalize pressure across the outer seal and to allow water that enters the cavity to drain out. This reduces water penetration into the interior. Venting does not change the insulating value, weight, or required edge clearance of the glass.

Question 42Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass panel where the specification calls for a silicone sealant with a stated movement capability of plus or minus 50 percent. What does this rating indicate?

  1. The sealant must be installed in a joint twice its width
  2. The sealant can be used only on horizontal joints
  3. The sealant will cure in half the normal time
  4. The sealant can accommodate extension and compression equal to half its installed joint width Correct answer.

Explanation

Movement capability is expressed as a percentage of the installed joint width and indicates how much the sealant can stretch and compress in service. A plus or minus 50 percent rating means the joint can move by half its width in either direction. It says nothing about cure time or joint orientation.

Question 43Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass panel in a storefront and must ensure that the glass does not bear directly on the frame. Which component is used to carry the weight of the glass?

  1. Pressure plates
  2. Cover caps
  3. Gaskets
  4. Setting blocks Correct answer.

Explanation

Setting blocks are placed under the glass edge to carry its weight and keep it clear of the frame. Gaskets seal the joint, pressure plates clamp the assembly, and cover caps finish the appearance. Only setting blocks are intended to carry the glass load.

Question 44Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a large annealed glass panel and must account for deflection under wind load. Which property of the glass primarily determines its resistance to bending?

  1. Its edge finish and labelling
  2. Its thickness and the size of the unsupported span Correct answer.
  3. Its surface coating and reflectivity
  4. Its colour and visible light transmittance

Explanation

Bending resistance depends primarily on glass thickness and the dimensions of the unsupported span, because stiffness increases strongly with thickness. Colour, coating, and edge finish affect appearance and durability but not the structural deflection under wind load. These are the variables used in glass strength calculations.

Question 45Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass panel in a system where the glass is held by a structural silicone joint on two opposite edges only. Which consideration is most important for this design?

  1. The joint must be designed to transfer wind load from the glass to the frame along those edges Correct answer.
  2. The glass must be tempered regardless of the design load
  3. The joint width must be at least 50 mm on all edges
  4. The glass must be installed with setting blocks only

Explanation

When glass is supported on only two opposite edges, the structural silicone joint must transfer the wind load from the glass to the frame along those edges. Joint geometry and glass type are determined by engineering, and a fixed 50 mm width is not a universal rule. Setting blocks alone do not provide the required load transfer.

Question 46Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass panel in a curtain wall where the design uses a toggle-lock gasket system. What is the primary advantage of this system compared with a pressure-plate system?

  1. It removes the need for any weather seal
  2. It eliminates the need for setting blocks
  3. It reduces the number of exterior fasteners and simplifies installation from the interior Correct answer.
  4. It allows the use of annealed glass in all locations

Explanation

Toggle-lock gasket systems engage a locking strip that compresses the gasket without a separate exterior pressure plate and fasteners, which simplifies installation and reduces exterior hardware. They still require setting blocks, weather seals, and appropriate glass selection. The system changes the clamping method, not the fundamental glazing requirements.

Question 47Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a laminated glass panel in a balustrade and the specification requires that the interlayer resist delamination in a wet environment. Which property should be verified?

  1. The colour of the setting blocks
  2. The interlayer type and its manufacturer's rating for exposed wet or humid service Correct answer.
  3. The thickness of the edge tape
  4. The glass tint and visible light transmittance

Explanation

Interlayers differ in their resistance to moisture and delamination, and the manufacturer's rating confirms suitability for wet or humid exposure. Tint, edge tape, and setting block colour do not address delamination resistance. Verifying the interlayer type is the key step.

Question 48Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing an insulating glass unit and must ensure that the unit is installed with the correct surface orientation. What information is needed to determine which surface should face the exterior?

  1. The colour of the spacer
  2. The number of setting blocks used
  3. The weight of the unit
  4. The manufacturer's labelling and the project specifications identifying the coated surface Correct answer.

Explanation

Insulating glass units are labelled to identify the coated surface and the correct orientation, and the project specifications confirm the design intent. Weight, spacer colour, and the number of setting blocks do not indicate surface orientation. Installing the unit with the wrong surface facing out can reduce performance and void the warranty.

Question 49Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is installing a glass panel in a location where the frame will experience significant movement from building sway. Which sealant property is most important to verify?

  1. The sealant's colour match to the frame
  2. The sealant's resistance to ultraviolet light only
  3. The sealant's movement capability and adhesion to the specific substrates Correct answer.
  4. The sealant's cure time at room temperature

Explanation

Joints subject to building movement require a sealant with adequate movement capability and verified adhesion to the actual substrates used. Colour, cure time, and UV resistance are relevant but secondary to movement capacity and adhesion. A sealant that cannot accommodate the movement will fail even if it is UV stable.

Question 50Industrial, Commercial, Institutional and Residential Glass and Glass Substitute Work

A glazier is setting an annealed glass pane into a storefront and the shop drawings show the glass edge clearance as 3 mm on all sides. Why is a minimum edge clearance specified between the glass edge and the bottom of the glazing pocket?

  1. To allow the setting blocks to be repositioned after the glass has been seated
  2. To permit the glazing gasket to be compressed without extruding past the sight line
  3. To provide a continuous drainage path so that condensation can escape the glazing pocket
  4. To isolate the glass from direct contact with the frame and allow for thermal expansion and frame movement Correct answer.

Explanation

Edge clearance keeps the glass from bearing directly on the frame or pocket bottom, so the pane can expand, contract, and shift with temperature change and structural movement without chipping or stressing the edge. The clearance is filled with setting blocks and sealant or gaskets that isolate the glass from hard contact. Drainage and weep paths are handled by separate slots and baffles, not by the edge clearance itself.