Mississippi Glass, Glazing, Windows and Skylights Examination

In architectural glazing, what does "bite" mean?

• AThe depth of glass edge captured in the frame rabbet or gasket pocket
• BThe air space between the two lites of an insulating glass unit
• CThe gap between the glass edge and the bottom of the rabbet
• DThe thickness of the structural silicone bead on the glass face

Per GANA-type glazing practice, where should the two setting blocks under a rectangular lite normally be placed?

• ATight against each vertical jamb to lock the corners
• BStacked at midspan so the transom sees one concentrated reaction
• CUnder the head member to keep the lite from dropping
• DAt the approximate quarter points of the sill, equally spaced from the glass centerline

A 60 in by 120 in lite is set on two setting blocks. Using the common metal-system rule of 0.1 in of block length per square foot of glass, but not less than 4 in, what length should each block be?

• A3 in
• B4 in
• C5 in
• D12 in

A storefront takeoff lists eight vision lites, each 48 in wide by 60 in high. What is the total glass area to order, in square feet?

• A160 sq ft
• B240 sq ft
• C320 sq ft
• D2,304 sq ft

Why must a glass lite be free to "float" in the opening rather than be hard-set against the metal on all four edges?

• ATo let the glass expand, contract, and rotate slightly without edge contact that causes b…
• BTo allow the lite to be removed later without cutting the gaskets
• CTo increase the visible glass area beyond the specified sightline
• DTo eliminate the need for setting blocks

What is the primary purpose of edge clearance around a lite?

• ATo hide the IGU spacer from outdoor view
• BTo increase the structural bite used for wind-load resistance
• CTo create a capillary path that holds water in the rabbet
• DTo provide space for thermal movement and keep the glass edge off the frame

A typical 1/4 in monolithic lite is detailed with 3/8 in bite and 1/4 in edge clearance. What minimum rabbet depth is required to provide both dimensions?

• A3/8 in
• B1/2 in
• C5/8 in
• D1 in

What Shore A hardness is commonly specified for elastomeric setting blocks (neoprene, EPDM, or silicone) in metal glazing systems?

• A20 ± 5
• B40 ± 5
• C85 ± 5
• D100 (Shore D)

Why must weep holes in a wet-glazed or insulating-glass pocket remain open after setting blocks and sealant are installed?

• ATo pressurize the IGU cavity and keep the desiccant dry
• BTo provide the only source of indoor ventilation for the room
• CTo lock the setting blocks so they cannot move to quarter points
• DTo drain water that enters the glazing pocket to the exterior

A field crew needs to trim 1/2 in off a fully tempered lite that arrived 1/2 in too wide. What is the correct action?

• AReject or reorder the lite; fully tempered glass cannot be cut after tempering
• BScore and break the lite on a cutting table as with annealed glass
• CGrind the edge with an abrasive blade until it fits the opening
• DHeat the edge with a torch and snap the trim strip off

How should crates of architectural flat glass typically be stored on a jobsite before installation?

• AFlat-stacked on the slab in direct sun so dirt can be washed off
• BLeaning loose against a wall at a steep angle with no edge protection
• COutdoors, unwrapped, so condensation can dry from the IGU edges
• DVertically, on padded racks or stillages, protected from impact and standing water

What is face clearance in a glazing pocket?

• AThe horizontal gap between the glass face and the stop, gasket, or sealant
• BThe distance from the finished floor to the bottom of the lite
• CThe width of the setting block measured along the sill
• DThe exposed daylight opening between verticals

A 1/4 in lite is glazed with 1/8 in face clearance on each side. What glazing-channel width is required?

• A1/4 in
• B3/8 in
• C1/2 in
• D3/4 in

In a dry-glazed metal system, how should side (anti-walk) blocks typically be installed in the vertical channels?

• ADriven hard against both vertical edges so the lite cannot move at all
• BOmitted whenever setting blocks are used at the sill
• CPlaced only at the head to hang the lite from the transom
• DWith about 1/8 in clearance between the glass edge and each block

Before cutting or ordering replacement lites, a glazier should first:

• AField-measure the actual openings, checking width, height, out-of-square, and pocket depth
• BAssume the architectural elevation dimensions are the glass sizes
• COrder every lite 2 in larger than the daylight opening and field-cut tempered glass to fit
• DUse only the original invoice sizes without measuring the installed frames

What is the main difference between wet glazing and dry glazing?

• AWet glazing uses gunnable sealants or tapes; dry glazing uses preformed gaskets and compr…
• BWet glazing is only for skylights; dry glazing is only for doors
• CWet glazing requires no weeps; dry glazing must be hermetically sealed
• DDry glazing uses only wood stops and linseed-oil putty

Setting-block width is commonly detailed as which of the following?

• AExactly equal to the glass thickness and the full channel width
• BHalf the glass thickness so water can pond on the sill
• CThe full channel width plus 1/4 in so the block is forced past the stops
• DAt least 1/8 in wider than the glass thickness and about 1/16 in less than the channel wi…

Using 3.27 lb/sq ft for 1/4 in glass, what is the approximate weight of one 48 in by 96 in lite?

• A105 lb
• B52 lb
• C157 lb
• D209 lb

Where are spacer shims (location blocks) used in a typical punched opening?

• AOnly under the sill in place of setting blocks
• BBetween the two lites of an IGU at the factory only
• CAcross the outdoor face as a temporary wind brace
• DIn the vertical and head pockets to center the lite and hold face/edge clearance while se…

In CSI MasterFormat, glazing, windows, and storefront work are specified primarily in which division?

• ADivision 03 - Concrete
• BDivision 07 - Thermal and Moisture Protection
• CDivision 08 - Openings
• DDivision 09 - Finishes

In wet glazing, what is a heel bead?

• AA decorative cap on the interior stool
• BThe outdoor weatherseal tooled on the face after the stops are installed
• CA butyl tape used only on plastic skylights
• DA sealant bead placed at the interior or unexposed glass-to-frame corner of the pocket be…

A heat-absorbing tinted lite cracks from the edge after a few sunny days. The pocket was glazed with almost no edge clearance and the exterior gasket ran well beyond the sightline onto the glass. What is the most likely cause?

• AThermal-stress breakage from a hot center, cool shaded edge, and restrained edge
• BNickel sulfide inclusion in annealed glass
• CInadequate CPSC Category II impact resistance
• DExcessive setting-block hardness only

If quarter-point setting-block placement is impractical, GANA-type guidance allows moving each block, provided the blocks stay equally spaced from center and the end of each block is no closer to the vertical glass edge than:

• A1 in, regardless of lite width
• BThe greater of 6 in or 1/8 of the glass width
• COne-half the glass width (the extreme corners)
• DThe centerline of the lite

When unpacking insulating glass, the installer should do which of the following first?

• AStand on the crate lid to break the bands faster
• BWash units with hydrofluoric acid to remove shipping powder
• CLay IGUs flat in the sun so the sealant can warm and flow
• DInspect each unit for edge damage, spacer defects, coating scratches, and fogging before…

What is the preferred way to lift a large architectural lite into a storefront opening?

• AWith clean vacuum cups or a rated vacuum lifter, plus adequate crew and a planned path
• BBy the raw glass edges with bare hands only
• CBy sliding the lite on its corner across the concrete slab
• DWith a single suction cup rated for half the lite weight

Why should insulating glass units not be stored long-term in direct sunlight while stacked tightly?

• ASunlight permanently increases the IGU's U-factor
• BThe desiccant requires UV exposure to remain active
• CDirect sun is required to cure the factory polyisobutylene primary seal
• DHeat can overpressure the sealed air space, stress the edge seal, and damage coatings

A replacement job needs 10 lites, each 36 in by 60 in. The estimator adds 10 percent waste for cutting and breakage of annealed stock. How many square feet of glass should be purchased?

• A135 sq ft
• B150 sq ft
• C165 sq ft
• D216 sq ft

How does fully tempered glass typically break compared with annealed glass?

• AInto long, dagger-like shards that stay in one piece
• BIt never breaks under impact
• COnly along the wire grid if it is not laminated
• DInto small, relatively blunt dice rather than large sharp shards

What is the safety function of the interlayer in laminated glass?

• AIt holds fragments together after the glass cracks, reducing laceration and fall-out
• BIt makes the glass four times stronger so it cannot crack
• CIt is only a decorative tint and has no safety role
• DIt replaces the need for any frame bite

Heat-strengthened glass (Kind HS) is selected instead of fully tempered glass primarily because:

• AIt always meets CPSC 16 CFR 1201 Category II without further testing
• BIt can be cut to size after heat treatment just like annealed glass
• CIt dices into small cubes and therefore needs no laminated interlayer in a guard
• DIt is stronger than annealed glass and has better optical quality and less spontaneous-br…

A dual-seal insulating glass unit typically uses which edge-seal combination?

• ALinseed-oil putty only, tooled on the jobsite
• BOpen-cell foam with no desiccant
• CStructural silicone on the outdoor face only, with no spacer
• DA polyisobutylene (butyl) primary moisture seal plus a structural secondary seal such as…

In a typical outboard-coated insulating glass unit, the low-e coating is most often placed on which surface?

• ASurface 2 (inside face of the outboard lite), to control solar heat while protecting the…
• BSurface 1 (outdoor face), so rain can wash the coating
• CBoth exposed room-side faces, so occupants can clean the coating daily
• DThe edge of the spacer only

What is a primary structural difference between conventional aluminum storefront and unitized or stick curtain wall?

• AStorefront is typically floor-supported and limited in height; curtain wall is hung from…
• BStorefront can never use insulating glass, while curtain wall must
• CCurtain wall is only wood, and storefront is only vinyl
• DThere is no difference; the terms are interchangeable in every specification

For a symmetric insulating glass unit under uniform wind pressure, how is load generally shared between the two lites?

• AThe outboard lite takes the entire load; the inboard lite is only a thermal pane
• BOnly the thicker lite is analyzed; the thinner lite may be ignored
• CLoad sharing occurs only if the unit is argon-filled
• DBoth lites share the load, so thickness and heat treatment of each lite matter in the AST…

Why is spandrel glass covering insulation or a back-pan usually heat-treated?

• ABecause annealed spandrel is illegal in every occupancy
• BBecause spandrel never needs a low-e coating
• CBecause heat-treating is the only way to apply a ceramic frit
• DBecause the dark ceramic frit or film plus trapped heat create high thermal stress at the…

Which glass type can still be scored and broken to size in the shop after it has been manufactured as flat stock?

• AFully tempered glass
• BHeat-strengthened glass
• CAnnealed float glass
• DChemically strengthened glass that has already been tempered

Spontaneous breakage of fully tempered glass is most often discussed in connection with which mechanism, and what process is used to reduce that risk?

• ANickel sulfide inclusions; heat-soak testing of tempered lites
• BExcess argon pressure; puncturing the IGU spacer on site
• CLow-e coating pinholes; acid washing the coating
• DSetting-block durometer; switching to wood shims

Traditional wired glass is generally not acceptable as safety glazing in IBC hazardous locations because:

• AIt is always thinner than 1/8 in
• BIt is illegal to use in any fire-resistance-rated door
• CIt is a plastic product, not glass
• DThe embedded wire does not keep it from producing dangerous shards, and it typically cann…

In structural silicone glazing (SSG), what is the difference between two-sided and four-sided SSG?

• ATwo-sided SSG bonds two opposite glass edges (usually verticals) while the other two edge…
• BTwo-sided SSG uses two tubes of sealant; four-sided uses four different chemistries
• CFour-sided SSG is only for plastic sheet; two-sided is only for mirrors
• DThere is no structural difference; the names refer only to jobsite access

What is the purpose of a thermal break in an aluminum window or storefront member?

• ATo structurally weld the interior and exterior aluminum together for higher wind load
• BTo hide the setting blocks from view
• CTo replace the need for insulating glass
• DTo interrupt the conductive aluminum path so indoor-side condensation and heat loss are r…

Which statement correctly distinguishes a casement window from an awning window?

• AA casement is hinged at the side and swings like a door; an awning is hinged at the top a…
• BA casement only slides horizontally; an awning only drops inward from the sill
• CBoth are fixed lites and differ only in mullion color
• DAn awning is a skylight; a casement is always a fire-rated door

Factory unit skylights and tubular daylighting devices are tested and labeled to which performance standard referenced by IBC Section 2405.5?

• AASTM C90 for concrete masonry
• BNFPA 70 National Electrical Code only
• CASTM D226 for asphalt felts
• DAAMA/WDMA/CSA 101/I.S.2/A440

Why is a silicone secondary seal typically specified on an IGU that will be structurally glazed?

• AThe secondary seal is exposed to UV and must carry structural load; silicone has the UV a…
• BSilicone is the only sealant that contains desiccant
• CBuilding codes ban polysulfide in all IGUs
• DSilicone is used so the unit can be field-cut to size

When selecting glass thickness for wind, which statement matches ASCE 7 / IBC components-and-cladding principles?

• AInterior-zone positive pressure is always the only load that must be checked
• BCorner and edge zones typically have higher local pressures, and negative (suction) press…
• CWind pressure is uniform over the entire elevation and never changes with height or expos…
• DIf the lite resists a 20 psf laboratory water test, it automatically satisfies any design…

A large wall-mounted mirror should be installed so that:

• AOnly unvented, acidic (acetoxy) silicone holds the entire weight with no mechanical suppo…
• BCompatible mirror mastic is used and the mirror has mechanical support or clips; the back…
• CThe mirror is fully bedded in oil-based glazing compound against an unsealed gypsum face
• DThe silvered backing is sanded off so mastic can bond to the glass