Commercial Glass Skylights: Installation, Repair & Replacement

Summary

Commercial Glass Skylights use insulated, laminated, or tempered glazing rated by NFRC for U-factor, SHGC, and light transmittance. Sky Design Concepts services, repairs, and installs these systems across Phoenix, Arizona, diagnosing seal failure or fogging before recommending restoration or replacement, with a free on-site evaluation.

Key Takeaways

Commercial Glass Skylights use insulated glass units with low-e coatings, often paired with laminated glass for safety and tempered glass for breakage resistance.
NFRC ratings, U-factor, SHGC, and visible transmittance, determine a unit’s heat and light performance, with SHGC mattering most in Phoenix’s cooling-dominated climate.
Glass itself does not yellow, so most repairs target the perimeter seals, gaskets, and flashing rather than the glazing.
Common failure signs include water stains, fog between panes, cracked or chipped glass, and brittle gaskets.
Fog between the panes signals a failed edge seal on an insulated glass unit, which requires replacement, not cleaning.
Sky Design Concepts works with Kingspan Light + Air, VELUX Commercial, Sunoptics, American Skylights, Bilco, and Acralight.
Every glass skylight more than six feet above a lower level requires OSHA-compliant fall protection under 29 CFR 1926.501(b)(4).

Glass skylights bring a level of clarity and architectural finish that fiberglass or acrylic systems can’t match, which is why building owners across Phoenix and the Southwest choose glass for lobbies, resort properties, and spaces where appearance matters as much as daylight. Sky Design Concepts services, repairs, and installs commercial glass skylight systems built from tempered or laminated glazing, backed by factory certification on Kingspan Light + Air and VELUX Commercial installs.

Glass carries its own failure points, seal failure between panes, cracked or chipped lites, and dirt film that dulls light transmission over time, and our crews diagnose which one is actually happening before recommending a fix. Whether a panel just needs a pressure wash or the glazing unit itself has failed, every visit starts with a free on-site evaluation and a written scope before any work begins.

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What Is a Commercial Glass Skylight System?

A commercial glass skylight is a framed roof opening glazed with glass units that admit daylight into the space below. Every system has three parts: the glazing, the frame, and the curb that ties the frame into the roof assembly.

Glazing: Insulated, Laminated, and Tempered Glass

Most commercial glass skylights use insulated glass units: two lites of glass separated by a sealed air space. Low-e coatings and tints on the glass control how much solar heat and visible light pass through. Many projects specify laminated glass on the lite that faces the occupied space, because laminated glass stays bonded to its interlayer if it cracks. Tempered glass is heat-treated and breaks into small pieces instead of long shards.

Frame and Curb

Aluminum extrusions form most glass skylight frames. A thermal break, a non-conductive barrier inside the frame, reduces heat transfer through the metal. The curb raises the frame above the roof plane, and the roof membrane and flashing seal against it. A leak at the curb or flashing is a common reason for a glass skylight service call.

How to Read the Performance Numbers

The National Fenestration Rating Council (NFRC) rates skylights for U-factor, solar heat gain coefficient (SHGC), and visible transmittance. U-factor measures heat flow through the unit. SHGC measures how much solar heat gets through. Visible transmittance measures how much daylight gets through. In Phoenix, where cooling load drives energy cost, SHGC deserves close attention. If you want help matching these ratings to your building, our daylighting consulting service covers light levels and glazing selection.

Glass Skylight Performance Ratings: U-Factor, SHGC, and Visible Transmittance

Glass skylight performance ratings show how much heat and daylight a unit lets into your building. This table explains each NFRC rating and what it means for a commercial roof in Phoenix.

Rating	What it measures	Better value	What it means for a Phoenix building
U-factor	How fast heat flows through the whole unit, including the frame and spacer	Lower	Less heat moves through the skylight, so conditioned air stays inside during cooling season
Solar heat gain coefficient (SHGC)	The fraction of solar energy that passes through the unit	Lower, for cooling-dominated climates	Less sun-driven heat enters the space, which lowers the cooling load under the skylight
Visible transmittance (VT)	How much visible light passes through the glazing	Higher, for more daylight	More daylight reaches the floor. Pair a high VT with a low SHGC so daylight does not add heat
Air leakage (optional rating)	Air movement around the unit	Lower	Less conditioned air escapes around the frame and curb
Condensation resistance (optional rating)	How well the unit resists moisture buildup on its surfaces	Higher	Less surface condensation on the interior side

NFRC ratings apply to a whole product at set test conditions and a set unit size, so ask for the rating on the exact unit specified for your roof.

Glass Skylight Repair, Restoration, and Replacement

We match the fix to the failure. A leak at a gasket needs a different repair than a fogged glass unit, and a dirty skylight with sound seals needs cleaning, not parts. Phoenix adds its own stress: summer heat breaks down sealants, and monsoon storms push wind-driven rain and dust against every joint.

Glass Skylight Repair

Glass skylight repair stops active leaks and secures loose or damaged components. Repairs include replacing gaskets, resealing glazing joints, re-flashing the curb, tightening or replacing corroded fasteners, and replacing a cracked lite when the frame is still sound. Our commercial skylight repair page covers the full repair process.

Pressure-Wash Restoration

Pressure-wash restoration removes mineral deposits, caked dust, and buildup from exterior glass and frames so daylight reaches the floor again. It works when the glass and seals are intact. It does not fix a leak or a fogged unit, and too much pressure can damage gaskets and sealants, so the method has to suit the glazing. When the evaluation finds worn seals, we pair cleaning with skylight restoration and wet sealing.

Glass Skylight Replacement

Replacement makes sense when repair cannot hold. Fogged insulated units, repeated leaks at the same curb, corroded frames, and cracked glass in a failed system all point that way. Depending on what the evaluation finds, replacement covers the glass units, the frame, or the full skylight and curb. See commercial skylight replacement for how we plan and schedule the work.

New Glass Skylight Installation

We install new glass skylights in new construction and as retrofits in existing roofs. A retrofit means cutting a new opening or enlarging an existing one, framing the curb, and flashing it into the roof membrane. Details are on our commercial skylight installation page.

Glass Skylights vs Polycarbonate and Fiberglass

Glass is the right glazing when you need clear daylight and views that do not yellow or haze with age. Polycarbonate and fiberglass fit other jobs, and the choice depends on the building, the roof, and how the space uses light.

	Glass	Polycarbonate	Fiberglass / Kalwall-type
Light quality	Clear, high visible transmittance with the right coating	Clear to diffuse, depending on the product	Diffuse, even light with low glare
Sun exposure	Does not yellow	Can yellow or haze over time in strong UV	Resin can yellow and the surface can erode (fiberbloom)
Weight	Heaviest of the three	Light	Light panels
Typical failure	Failed edge seals, cracked lites, worn gaskets and sealants	Hazing, scratching, cracked panels	Yellowing, fiberbloom, leaking joints
Best fit	Atriums, lobbies, offices, retail, school and education facilities, and any space where clear glazing matters	Domes and budget-driven daylighting	Warehouse and industrial skylights, gyms, and spaces that need diffuse light

We install and service all three. If your building has polycarbonate or acrylic units, see our dome, unit, and polycarbonate skylights page. If it has a translucent sandwich panel, see fiberglass and Kalwall-type skylights. For wall and roof panel assemblies, see translucent wall and roof assemblies.

Arizona sun speeds up the aging of plastic glazing and the sealants around it. Glass itself does not yellow, so its service life depends on the seals, gaskets, and flashing around it. That is why many glass skylight repairs focus on the perimeter and not on the glass.

Signs You Need Glass Skylight Repair or Replacement

A glass skylight that leaks over inventory, equipment, or an occupied floor needs attention now, and a skylight that only looks worn needs an inspection soon. These are the signs to check for:

Water stains or drips below the skylight: Moisture after rain usually points to failed sealant, a bad gasket, or flashing that has pulled away from the curb.
Fog or moisture between the panes: Fog inside an insulated glass unit means the edge seal has failed, and the unit needs replacement.
Cracked, chipped, or shattered glass: Any crack in overhead glass is a safety concern, and a cracked lite lets water in.
Sealant that is cracked, shrunken, or peeling: Glazing sealant ages in heat and UV and stops keeping water out.
Gaskets that are brittle or flattened: Hardened gaskets no longer press against the glass.
Corroded or bent frames: Rust, bowed aluminum, or loose fasteners let the unit move and open gaps.
Mineral deposits, haze, or caked dirt on the exterior glass: Hard-water spotting and desert dust cut daylight. A pressure-wash restoration often fixes this when the glass itself is sound.
Condensation or staining on the interior side: This can mean air or water is getting past the frame.
Rising cooling cost or glare under the skylight: An older low-performance glass unit can let in more heat than the space needs.

If you see more than one of these, book a free on-site evaluation. We inspect the glass, seals, frame, and curb, and tell you whether repair or replacement makes sense. For a deeper look at that decision, read Repair, Restore, or Replace?

Fall Protection and Code for Glass Skylights

Treat every glass skylight as a hole in the roof. OSHA’s construction fall protection rule, 29 CFR 1926.501(b)(4), requires employers to protect workers from falling through holes, including skylights, more than 6 feet above a lower level. Accepted protection includes personal fall arrest systems, covers, and guardrail systems around the opening. Unless the manufacturer rates a unit for foot traffic, glass should never be treated as a walking surface.

This matters to building owners for two reasons. Roofers, HVAC technicians, and maintenance staff walk near skylights on commercial roofs, and a worn or loose unit raises the risk. Guards and screens also keep a damaged lite from dropping onto the floor below. We install skylight fall protection, guards, and screens on new and existing glass skylights, and we can add them during a repair or replacement visit.

Overhead glass also falls under building code safety-glazing requirements, which is one reason replacement units often use laminated glass.

Glass Skylight Manufacturers We Work With

Rather than tying glass skylight projects to a single house brand, Sky Design Concepts represents and installs systems from a vetted lineup of manufacturers, matching each one to the building rather than the other way around.

We work with Kingspan Light + Air, VELUX Commercial, Sunoptics, and American Skylights for glass skylight systems, and source roof hatches and smoke vents from Bilco for projects that pair daylighting with code-required venting. For custom glazing that doesn’t fit a stock catalog, we build and service systems from Acralight.

Because we’re not locked into one manufacturer, the glazing and frame we recommend are driven by your roof, your building, and your budget, not a single product line. Browse every brand we represent on our manufacturers page.

What Affects the Cost of a Glass Skylight Project

Glass skylight pricing depends on scope, so a free on-site evaluation gives a firmer number than any online range. These factors move the price most:

Repair, restoration, or replacement: Resealing a joint costs less than replacing a unit, and replacing a unit costs less than replacing a full skylight and curb.
Size and number of units: Larger glass and more openings add material and labor.
Glass specification. Laminated glass, low-e coatings, and tints change the unit cost.
Frame and thermal break: Frame material and design affect both cost and energy performance.
Curb and roof condition: A damaged curb or deteriorated flashing adds work.
Roof access and building use: Roof height, crane or lift needs, and work-hour limits all affect labor.

Our Glass Skylight Process

Every glass skylight job starts with a free on-site evaluation, and the evaluation decides the scope. Here is how a project moves from first visit to finished roof:

Free on-site evaluation: We inspect the glass, edge seals, gaskets, frame, curb, and flashing, and we check how the skylight ties into the roof membrane.
Findings and recommendations: We explain what failed and why, then recommend repair, restoration, or replacement. If the skylight is sound, we say so.
Glazing and system selection: For replacement or new installation, we match the glass type, coatings, and frame to the building and to the manufacturers we work with.
Scheduling and roof access: We plan the work around your tenants, operations, and roof access.
Repair, replacement, or installation: Our crew sets or repairs the glazing, frame, and curb, then flashes and seals every joint.
Final check: We inspect the seals and flashing and review the finished work with you.

Ready to start? Request a free on-site evaluation or call (602) 276-5001.

Why Choose Sky Design Concepts

Commercial work only, since 1985: Every glass skylight we install or repair sits on a commercial, industrial, institutional, or public building.
Licensed in Arizona, Nevada, and New Mexico: We also travel to West Texas for glass skylight projects.
Several manufacturers, one recommendation: We install systems from multiple skylight manufacturers, so the glass, frame, and curb we specify fit your roof.
One contractor from repair to replacement: Glass skylight repair, restoration, replacement, and installation all come from the same crew.
A straight answer at the evaluation: If your skylight is sound, we tell you. If it needs repair or replacement, we show you why.

What Our Clients Are Saying

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✦ What customers say

Customers describe Sky Design Concepts as professional from start to finish, with a courteous, efficient installation team that goes above and beyond. Reviewers say the installers clean up after the job is done, call the company a local Arizona business, and say they would use it again for future skylight work.

Professional installers Clean job sites Efficient work Local Arizona company Would hire again

AI-generated summary of customer reviews, updated November 3, 2026.

Jason Lowery
Local Guide · Google

★★★★★

Amazing efficiency! Professional installation team! Arizona local and family owned/operated. Couldn’t ask for a better all around group. Always willing to go above and beyond!

Alfred Dorantes
Google

★★★★★

Courteous & Professional staff. Installers clean up after they’re finished with the projects. Highly recommend

Connor Smith
Google

★★★★★

SkyDesign was great to work with start to finish! Very professional and do great work! Will definitely use this company again for any skylight needs

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Business Hours:

Monday: 7AM – 4PM
Tuesday: 7AM – 4PM
Wednesday: 7AM – 4PM
Thursday: 7AM – 4PM
Friday: 8AM – 12PM
Saturday: Closed
Sunday: Closed

Proudly Providing Glass Skylight Service in Phoenix & Across Arizona, Nevada, New Mexico and West Texas

Sky Design Concepts services, repairs, and installs commercial glass skylight systems for contractors, developers, school districts, and property owners throughout Arizona, Nevada, New Mexico, and West Texas.

We are proud to provide glass skylight service in Phoenix, AZ, Scottsdale, AZ, Tempe, AZ, Tucson, AZ, Mesa, AZ, Chandler, AZ, Glendale, AZ, Goodyear, AZ, Tolleson, AZ, Gilbert, AZ, Peoria, AZ, and Avondale, AZ, as well as Las Vegas, NV, Henderson, NV, and Reno, NV; Albuquerque, NM, Santa Fe, NM, and Las Cruces, NM; and El Paso, TX, and Midland–Odessa, TX. For a full view of our coverage, see our service area page.

Get a Free On-Site Evaluation for Your Commercial Glass Skylights Today

A leaking, fogged, or cracked glass skylight gets more expensive the longer it stays on the roof, because water damages the ceiling, the insulation, and whatever sits below. Sky Design Concepts will inspect the glass, seals, frame, and curb at no charge, tell you whether repair, restoration, or replacement fits your building, and give you a clear scope before any work starts.

Call us at (602) 276-5001, or request your free evaluation today.

Frequently Asked Questions

How long does a commercial glass skylight last?

A commercial glass skylight can last for decades, but its seals, gaskets, and flashing usually wear out before the glass does. Heat, UV, and roof movement age those parts first. Regular inspection catches small failures before they become leaks, and our skylight restoration and wet sealing service extends the life of a sound unit.

Can a leaking glass skylight be repaired?

Yes, most leaking glass skylights can be repaired when the frame and glass are still sound. The leak usually comes from worn gaskets, failed sealant, or flashing at the curb, and each of those can be replaced or resealed. If the frame is corroded or the unit has failed in several places, replacement is the better fix. We confirm this during a free on-site evaluation.

What does fog between the panes of a glass skylight mean?

Fog between the panes means the edge seal on the insulated glass unit has failed. Moisture has entered the air space, and the unit cannot be cleaned from the inside. The fix is to replace the insulated glass unit, and we check the frame and curb at the same time.

Is glass or polycarbonate better for a commercial skylight?

Glass is better when you need clear daylight that does not yellow, and polycarbonate is better when you need a lighter unit. The right choice depends on the building and how the space uses light. Compare options on our dome, unit, and polycarbonate skylights page, or ask us to walk your roof.

Can you install a glass skylight on an existing commercial roof?

Yes, we retrofit glass skylights into existing commercial roofs. The work includes sizing the opening, framing the curb, and flashing the unit into the roof membrane. See commercial skylight installation for the full scope.

What does pressure-wash restoration do for a glass skylight?

Pressure-wash restoration removes mineral deposits and caked dust from exterior glass and frames so more daylight comes through. It works when the glass and seals are intact. It does not stop leaks or fix fogged units, so we inspect the seals first. See skylight restoration and wet sealing.

Do glass skylights need fall protection?

Yes, a glass skylight should be treated as a hole in the roof, and workers near it need protection. OSHA requires covers, guardrails, or personal fall arrest systems around skylights when the roof is more than 6 feet above a lower level. We install skylight guards and screens for commercial buildings.

How much does glass skylight repair or replacement cost?

Cost depends on the repair or replacement scope, glass specification, unit size, and roof access. A free on-site evaluation gives a firmer number than any general range. Contact us to schedule one.

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Getting your commercial skylight project underway is simple, no pressure, no guesswork, just a clear path from inspection to installation.