Fiberglass & Kalwall-Type Skylights

Summary

Fiberglass & Kalwall-Type Skylights develop fiberbloom, a UV-driven surface breakdown, over their 20 to 30-year service life. Sky Design Concepts diagnoses the condition, isolated chalking points to restoration, structural damage points to replacement, regardless of original manufacturer, with a free on-site evaluation in Phoenix, Arizona.

Key Takeaways

Fiberglass & Kalwall-Type Skylights are translucent sandwich panels, two fiberglass-reinforced face skins bonded to an internal grid core, that spread even daylight across large interior spans.
Fiberbloom, a UV-driven yellowing and chalking of the resin face, is the most common failure mode, typically appearing after 20 to 30 years of service.
Isolated chalking and seam leaks usually point to restoration and wet sealing; bowing, widespread cracking, or an aging system usually point to full replacement.
A degraded panel doesn’t just look worse, it transmits less usable daylight and measurably loses energy performance tracked by the National Fenestration Rating Council (NFRC).
Sky Design Concepts services and replaces these panels regardless of original manufacturer, and is clear that it is not a Kalwall representative.
Every evaluation is free, with a written scope and timeline before any work begins.

Sky Design Concepts services, repairs, and replaces Fiberglass & Kalwall-Type Skylights as part of our full lineup of commercial skylight systems across Phoenix and the Southwest. These translucent sandwich panels, two fiberglass-reinforced face skins bonded to an internal grid core, have brought soft, even daylight into warehouses, schools, and gymnasiums for decades, and our crews know exactly how Arizona’s sun and heat age them.

Whether a panel shows early-stage yellowing or has reached the end of its 20 to 30-year service life, Sky Design Concepts diagnoses the actual condition before recommending restoration or replacement, regardless of which manufacturer originally installed it. Every evaluation starts free, with a written scope before any work begins.

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What Fiberglass & Kalwall-Type Skylights Are

A fiberglass or Kalwall-type skylight is a translucent sandwich panel: two fiberglass-reinforced face skins bonded to an internal grid core, instead of a single sheet of glass or acrylic. The construction spreads daylight evenly across a room rather than letting it through as a single bright spot, which is why schools, warehouses, and gymnasiums have used this panel type for decades. See Dome, Unit & Polycarbonate Skylights and Glass Skylights for the other panel types we service on the same roofs.

Kalwall is one well-known manufacturer of this panel technology, and many Phoenix buildings have Kalwall-type systems installed by Kalwall itself or by other fabricators using the same sandwich-panel approach. Sky Design Concepts services and replaces these panels wherever we find them; we are not a Kalwall representative and don’t sell new Kalwall systems. Kalwall’s own documentation on its panel technology is a useful reference for building owners who want the manufacturer’s specifications on the panel they already have.

Our crews also service the broader translucent wall and roof assemblies built from the same panel family, since the fiberglass sandwich technology shows up in vertical wall systems as well as roof-mounted skylights.

What Fiberbloom Looks Like

Fiberbloom isn’t always obvious from the ground. On a fiberglass or Kalwall-type panel, it typically starts as a faint yellowing at the surface, barely noticeable against a clear sky, before progressing to a visible chalky, matte film that dulls the panel’s translucency and can rub off slightly to the touch. In advanced stages, the surface roughens and the panel’s structural face skin begins to erode, which is when light transmission drops noticeably and the panel moves from a restoration candidate toward replacement.

Because the early stages are subtle, many building owners don’t notice fiberbloom until someone points it out during a roof walk or a skylight repair call for an unrelated issue. Our crews check panel conditions for this during every evaluation, whether or not fiberbloom was the reason for the visit.

Signs of Fiberglass & Kalwall-Type Panel Failure We Diagnose

Fiberglass and Kalwall-type panels don’t fail all at once; they show specific, visible signs years before a full replacement becomes necessary. The table below lists what our crews look for on a Phoenix roof evaluation.

Sign	Likely Cause	What It Means
Yellowing or a chalky surface film	Fiberbloom: UV breakdown of the resin face	Usually early-stage; a candidate for restoration and wet sealing
Visible bowing or warping in the panel	Moisture intrusion into the core, or repeated thermal cycling	Panel integrity is compromised; usually needs replacement
Cracking at panel seams or joints	Failed sealant or gasket, often from thermal movement	Seam repair; the rest of the panel is often still sound
Water staining on the interior ceiling	Failed seal at the panel perimeter or joint	Repair or reseal, depending on how far it has spread
Dull or reduced daylight indoors	Years of surface chalking and dirt buildup	Often resolves with cleaning or restoration, not a new panel

Energy Performance & Degraded Panels

A fiberbloomed or heavily chalked panel doesn’t just look worse, it measurably underperforms. Light and energy performance on skylight and daylighting glazing is tracked by independent bodies like the National Fenestration Rating Council (NFRC), and a degraded panel transmits less usable daylight and loses some of the insulating value it had when new. That typically means a building leans more heavily on electric lighting and HVAC to compensate, a cost most facility managers never trace back to the roof.

Addressing fiberbloom early, while a panel is still a restoration candidate, typically restores both the appearance and the energy performance the system was originally specified for. Waiting until a panel is visibly failing usually means the energy loss has been compounding for years already.

Repair, Restoration, or Replacement for Fiberglass & Kalwall-Type Panels

Our free on-site evaluation decides which category a fiberglass or Kalwall-type panel falls into, not a guess based on the building’s age alone. A job that involves swapping out full panel sections, rather than resealing joints or cleaning the surface, can also fall under a building permit from the City of Phoenix Planning & Development Department, so our crews flag that early rather than after the work is scheduled.

The table below is a quick reference for what our crews typically find on these panels and which service fits.

Attribute	Detail	What It Signals
Panel construction	Two fiberglass-reinforced face skins bonded to an internal grid core	The structural core typically outlasts the surface finish by years
Typical service life	20 to 30 years before major resin degradation	Age alone doesn’t decide the service, condition does
Common failure mode	Fiberbloom: UV-driven yellowing and surface chalking	Isolated chalking usually points to restoration, not replacement
Isolated seam leak or single failed gasket	One active leak point, rest of panel intact	Points to targeted Repair
Widespread yellowing or chalky film across the panel	Surface-level wear, structural core still sound	Points to Restoration & Wet Sealing
Bowing, warping, or cracking across multiple panels	Moisture has reached the panel’s core, not just the surface	Points to full Replacement
System original to a building decades old, no service history	Panel likely past its 20 to 30-year service window	Points to full Replacement

Isolated chalking and seam leaks usually point toward restoration or targeted repair. Bowed panels, widespread cracking, or a system original to a building built decades ago usually point toward full replacement instead. A free on-site evaluation confirms which category applies before any work is scheduled.

What to Expect for Timing

Most fiberglass and Kalwall-type service calls fall into one of two timelines. Restoration and wet sealing, cleaning gaskets and joints and re-caulking, typically runs one to two days depending on the number of panels and joints involved. Full panel replacement takes longer, since replacement panels are often ordered to match the existing system’s size, color, and grid core, and installation is scheduled around that delivery window.

Scheduling your evaluation as soon as yellowing or a leak shows up gives the most flexibility on timing and the best odds the panel still qualifies for restoration rather than replacement.

Who We Service These Fiberglass & Kalwall-Type Panels For

This work is commercial only, warehouses, distribution centers, schools, hospitals, municipal buildings, and retail centers, apart from custom residential estates. These buildings rely on fiberglass and Kalwall-type panels specifically for the wide, even daylight they spread across large floor plans, so a failing panel often means a dimmer, less efficient space long before it becomes a visible leak.

Our in-house crews hold factory certification with Kingspan Light + Air and VELUX Commercial for new installs, and also service and replace legacy fiberglass and Kalwall-type systems from manufacturers we don’t represent, so a building isn’t turned away over brand. See the Services hub for the full range of repair, replacement, and installation work we offer, or Warehouse & Industrial Skylights for the large-scale fiberglass systems common on distribution centers.

Why Choose Sky Design Concepts

Honest about representation: We service and replace Kalwall-type panels on request; we don’t claim to be a Kalwall representative, and we won’t tell a building owner otherwise.
We know fiberbloom when we see it: Years of inspecting these panels in Arizona heat means our crews catch early-stage chalking and yellowing before it turns into a full panel failure.
An honest repair-or-replace call: We tell building owners whether a panel is a restoration candidate or past that point, instead of defaulting to the bigger job.
Factory-certified on the brands we represent: Kingspan Light + Air and VELUX Commercial installs carry factory certification, alongside our service work on legacy fiberglass and Kalwall-type systems.

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 Fiberglass & Kalwall-Type Skylight Service in Phoenix & Across Arizona, Nevada, New Mexico and West Texas

Sky Design Concepts services and replaces fiberglass and Kalwall-type skylight panels for contractors, developers, school districts, and property owners throughout Arizona, Nevada, New Mexico, and West Texas. Find your city below, or contact us if your location isn’t listed.

We are proud to provide fiberglass and Kalwall-type 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.

Schedule a Free Fiberglass & Kalwall-Type Panel Evaluation Today

A yellowed or leaking fiberglass panel rarely fixes itself, and waiting usually moves a building from a restoration candidate to a full replacement job. Sky Design Concepts gives Phoenix building owners a free on-site evaluation and a written scope for fiberglass and Kalwall-type panels, with factory-certified crews and no guessing at the diagnosis before we’ve seen the roof.

Call (602) 276-5001 or contact us to schedule your evaluation.

Frequently Asked Questions

Is Sky Design Concepts a Kalwall representative?

No. Sky Design Concepts services and replaces Kalwall-type panels already installed on a building, but is not a Kalwall representative and does not sell new Kalwall systems.

What is fiberbloom?

Fiberbloom is the UV-driven breakdown of the resin surface on a fiberglass or Kalwall-type panel, showing up as yellowing and a chalky film. It’s the most common failure mode our crews find on these panels in Phoenix.

How long do fiberglass and Kalwall-type skylights last?

Typically 20 to 30 years before UV exposure causes significant resin degradation. A free on-site evaluation tells a building owner where a specific panel falls in that range.

Can a yellowed panel be fixed without full replacement?

Often, yes. Panels caught in the early stages of fiberbloom are frequently candidates for restoration and wet sealing rather than a full replacement. Bowed panels or widespread cracking usually need replacement instead.

Do these panels need a building permit to replace?

It depends on scope. Resealing joints or cleaning a panel typically doesn’t, while swapping full panel sections can fall under the City of Phoenix Planning & Development Department’s commercial building permit requirements. Our crews flag this during the evaluation.

Do you install new Kalwall systems, or only service existing ones?

Sky Design Concepts services and replaces existing fiberglass and Kalwall-type panels; we are not a Kalwall representative. For new commercial skylight installation using the brands we represent, see Commercial Skylight Installation.

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