What Is Aluminum Storefront Framing?

Aluminum storefront framing is a system of extruded aluminum members — verticals (mullions), horizontals (rails), and perimeter frames — that hold large panes of glass in a commercial façade. Unlike curtain-wall systems that hang off a building's structure, storefront framing is a ground-supported assembly bearing its own dead load and transferring wind and impact loads to the surrounding rough opening. That distinction matters enormously when you're pulling permits in Florida, where wind-load and hurricane-impact requirements govern nearly every commercial glazing specification.

What Aluminum Framing Sizes Are Available for Storefronts?

Standard aluminum storefront framing profiles are described by their depth dimension — the measurement from the interior face to the exterior face of the frame member. The most common series are:

• 1¾″ (45 mm) face / 3½″ depth — the entry-level workhorse for low-rise retail, interior storefronts, and partitions with modest spans.
• 2″ face / 4½″ depth — the most widely specified series for single-story commercial fronts; balances sight-line width against structural performance.
• 2″ face / 6″ depth — preferred for taller openings (up to roughly 14 ft) or wide-bay glazing that sees higher wind pressure.
• 2½″ face / 6″ or 8″ depth — heavy commercial and high-wind applications; common in Florida coastal zones where design wind pressure can exceed 60 psf.

Face width (the visible aluminum you see on the glass line) typically runs from 1¾″ to 2½″. Narrower faces create a cleaner, more contemporary look; wider faces offer more rigidity and are easier to detail at corners and sills.

Glass pocket depth determines the glazing bite — usually ½″ to ¾″ of bite for standard ¼″ monolithic glass and up to 1″ bite for laminated impact units. Gladiator's commercial systems start with 6 mm glass as standard and can accommodate laminated, tempered, or insulated impact units depending on the project's energy code and hurricane-zone requirements.

What Are the Main Storefront Framing Configurations?

Storefront framing is assembled from the same extrusion library, but the final configuration is driven by the building program. Here are the configurations architects and contractors specify most often:

Single Entry + Sidelites

One commercial door centered in the opening, flanked by fixed glass panels on one or both sides. Ideal for boutique retail, medical offices, and service businesses where foot traffic is moderate. The sidelite width is fully customizable to fill the rough opening.

Double Entry + Sidelites

Two commercial doors — typically in-swing or out-swing aluminum-framed units — with fixed glass on the flanks. The go-to configuration for restaurants, gyms, and mid-volume retail. The paired doors share a center mullion that must be engineered to carry both door-load reactions.

Double Entry + Sidelites + Transom

Adds a continuous horizontal glass band above the door and sidelite assembly. Transoms dramatically increase daylighting, allow the wall assembly to reach slab-to-slab heights, and visually heighten the entry. The intermediate horizontal that separates doors from transom is called a lock rail or transom bar and is a standard extrusion in any full-depth profile series.

Storefront Bay + Wide Sidelites + Transom

A full-width glazed bay where wide fixed lites flank the entry doors and the entire assembly is capped with a transom. Common in bank branches, showrooms, and multi-tenant strip centers. Bay widths can run to 40+ ft when intermediate structural mullions are engineered correctly.

Display Window Wall — No Door

A fully fixed glazed wall with no operating unit — used for window displays, lobby vision glass, or interior conference partitions. Without door hardware to detail, the framing can be minimized and the sight lines kept as slim as possible.

Grand Entrance + Transom

Oversized doors — often 4 ft or wider per leaf — combined with a full-height transom for hotel lobbies, corporate headquarters, or civic buildings. Door weight and hardware specification become critical: heavy-duty pivots or concealed closers must be matched to door mass.

Super-Long Run + Transom

Continuous glazing spanning an entire building face, sometimes exceeding 100 linear feet. Structural engineering drives mullion depth and spacing; thermal movement must be managed with expansion joints at prescribed intervals (typically every 20–25 ft of run).

What Thermal Performance Should You Expect from Aluminum Storefront Framing?

Standard (non-thermally broken) aluminum framing conducts heat readily and will not meet Florida's current commercial energy code (Florida Building Code — Energy Conservation) in most climate zones without a thermal break. A thermal break is a low-conductivity polyamide or polyurethane barrier inserted into the extrusion cavity between the interior and exterior aluminum faces, interrupting the conductive path.

Gladiator's commercial storefront systems use thermally broken aluminum profiles, which allows the whole-unit assembly to achieve NFRC-rated U-factors competitive with code minimums for commercial glazing. When paired with low-e insulated glass units (IGUs), thermally broken storefront framing can reach whole-frame U-factors in the 0.35–0.45 range — a meaningful improvement over legacy non-broken systems that often land above 0.60.

For Florida contractors and architects specifying in HVAC-sensitive buildings, the thermal-break profile is essentially non-negotiable for both code compliance and long-term building performance.

How Does Storefront Framing Differ From Curtain Wall?

Storefront framing is ground-bearing and pressure-glazed; it fits within a defined rough opening and is relatively straightforward to detail, flash, and install. Curtain wall is a structurally independent skin that spans multiple floors and is engineered as a primary building enclosure element — significantly more complex and expensive.

For buildings under roughly four stories with standard commercial openings, storefront framing offers the better value proposition: comparable sight lines, full hurricane-impact glass compatibility, and far simpler installation. For high-rise or complex multi-story glazing, curtain wall takes over. Most Florida commercial projects in the one-to-three-story retail, restaurant, and office segment are well served by a properly engineered storefront system.

What Should Builders and Architects Know About Florida Hurricane Requirements?

Florida's High-Velocity Hurricane Zone (HVHZ) — which covers Miami-Dade and Broward counties — and the broader Florida Building Code wind map impose design wind pressure (DP) ratings on all exterior glazing assemblies. A storefront system specified for a Jacksonville project (Wind Zone II, typically 130 mph design wind speed) will have different DP requirements than one installed on the Gulf Coast or South Florida.

Key compliance checkpoints include:

• NOA (Notice of Acceptance) from Miami-Dade County or a Florida Product Approval number for the framing-plus-glass assembly.
• Impact-rated laminated glass or an approved storm shutter/screen over standard annealed glass — the former is overwhelmingly preferred for commercial façades.
• Anchor design stamped by a Florida-licensed PE, matched to the substrate (concrete, CMU, steel, or wood-backed metal stud).
• Sealant and flashing details meeting the WRB continuity requirements of the FBC Exterior Envelope chapter.

Gladiator's factory-direct model means our engineering team can provide project-specific documentation support — an advantage over sourcing framing through a distribution chain where technical accountability is diffuse.

How Does Factory-Direct Purchasing Affect Storefront Framing Cost?

Storefront framing priced through a traditional dealer-distributor chain carries margin at every step: extrusion mill → systems house → regional distributor → glazing contractor. Factory-direct purchasing eliminates the middle tiers, which routinely represent 20–35% of the landed cost of the framing package. For a 40-ft commercial front with doors, that delta is material — often several thousand dollars on the framing alone before glass is factored in.

Gladiator ships factory-direct nationwide with free freight included, and our 15-year warranty travels with the product regardless of where the project is located. Builders working on multiple commercial sites can also explore our reseller and wholesale program for volume pricing on recurring commercial projects.

For projects that pair a commercial entry with a residential or mixed-use glazing package, our full product line covers the full envelope: sliding glass doors, bi-fold doors, pivot doors, and folding passthrough windows — all from the same factory and the same warranty umbrella.

Ready to Spec Your Commercial Storefront?

Our commercial team works directly with architects, general contractors, and glazing subcontractors to confirm framing series selection, glass unit compatibility, wind-load documentation, and lead times. Contact Gladiator Window & Doors for a project-specific quote — no showroom markup, no distribution lag, just factory-direct expertise shipped to your site.

Frequently Asked Questions

What is the most common aluminum storefront framing depth?

The 2″ face / 4½″ depth series is the most widely specified profile for single-story commercial storefronts. It handles typical retail-height openings (up to about 10–12 ft) with standard wind loads and accommodates both monolithic and insulated glass units.

Can aluminum storefront framing meet Florida hurricane codes?

Yes — when the framing system carries a valid Florida Product Approval or Miami-Dade NOA, is installed with impact-rated laminated glass, and is anchored per a PE-stamped design, it fully satisfies Florida Building Code requirements including HVHZ. Always verify the approval covers the specific glass unit and DP rating your project requires.

What is a thermal break and do I need one?

A thermal break is a low-conductivity barrier inside the aluminum extrusion that prevents heat from conducting freely between the interior and exterior faces of the frame. Florida's commercial energy code requires thermally broken framing in most conditioned commercial spaces; it also reduces condensation risk and improves occupant comfort near the glass line.

How wide can a single storefront bay span without a structural mullion?

Maximum unsupported span depends on the profile depth, wind load, and glass size. In practice, fixed lites in a 4½″ system are typically limited to about 5–6 ft of width before an intermediate mullion is needed. Wider bays using a 6″ or 8″ system can push to 8–10 ft per lite with proper engineering. Always confirm spans against the system's published load tables and your local design wind pressure.

What is the lead time for factory-direct commercial storefront framing?

Standard configurations typically ship within 4–6 weeks from order confirmation, including custom-cut frame members and matched hardware. Complex or very large assemblies may require additional production time. Gladiator's factory-direct model eliminates distributor queues, which can add weeks to lead times on dealer-sourced systems.