At a glance
- A translucent envelope admits diffuse daylight across a warehouse floor without the view-out a glazed shopfront needs, using light-transmitting system panels.
- Danpal builds engineered system panels joined by a standing seam and connector, designed for high air and water tightness and wind loads.
- Light transmission, U-value and solar heat gain are tuned per project; Danpal defines panel, loads and daylight percentage per building.
- Logistics projects should confirm the governing standards regime early, since construction requirements differ market by market.
Danpal
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A light-transmitting envelope brings daylight into a warehouse or logistics center by replacing opaque wall or roof zones with translucent panels. These panels let light through but cannot be seen through, so diffuse daylight reaches the floor, and they are lighter and need far less supporting structure than heavy, brittle glass. Danpal supplies that envelope as an engineered system rather than loose boards. Danpalon polycarbonate panels are joined edge to edge by a standing seam and a connector, with dedicated system components, so the assembly is designed for high air and water tightness and to carry wind and snow loads.
The difference matters at concept stage, well before a manufacturer is chosen. A sheet is a flat board installed without an engineered jointing system, while a system panel is part of a designed assembly. Danpal pioneered the standing seam, and the system-panel approach became the industry standard for architectural building-envelope work. On a distribution shed, Danpal defines the system per project: which panels suit the loads and wind conditions, what U-value the named assembly reaches, and which reaction-to-fire classification applies to the specific panel, system configuration and market. Where daylight strips meet an insulated roof from another supplier, that interface must be detailed and confirmed with Danpal per project.
In Danpal's account, natural daylight is above all what buildings want, and natural light improves well-being in occupied space. This is a qualitative claim the company makes, not a measured figure. Glass still has its place wherever a view out is needed, and the comparison section below sets out how to choose zone by zone. As of 2026, Danpal works on these projects with the architect at specification and with the contractor at supply, and supports the build through installation, working to whichever local standards regime governs the project.
How does a translucent façade bring daylight deep into a warehouse or logistics center?
A translucent façade brings daylight into a warehouse by turning a band of the wall into a light-transmitting surface instead of a row of separate openings. A Danpalon panel is extruded as a multicell structured panel, and the Danpal Facade System provides diffusion of light. On the Harim Pet Food Factory and Visitors Center, a Danpal project reference, the Danpal Facade System's diffusion of light reduced eye strain for occupants and cut the need for artificial lighting during daylight hours.
Danpal defines that diffusion per project rather than from a catalog. The attributes that govern it are these:
- Light transmission (LT) is the percentage of incident daylight the panel passes. It is published per color and per thickness band and is indicative within production tolerances. It sets how much daylight reaches the floor.
- Solar Heat Gain Coefficient (SHGC) measures how much solar energy enters with that light. It is specified together with LT.
- Panel thickness and structure decide the trade-off between daylight and insulation: thicker multicell build-ups insulate better and transmit less.
- Color and finish run from clear to Reflective Grey, and each choice shifts LT and SHGC together.
- U-value is stated for a named panel or assembly and confirmed for the configuration actually drawn.
Danpal's published glazing-material data was tested in accordance with ASHRAE 74-1988 procedures. It gives clear Danpalon 86% visible light transmission as a 4 mm compact panel, falling to 41% at 50 mm. The figures are indicative and may vary within manufacturers' production tolerances.
Where should translucent daylight bands sit on a high-bay warehouse envelope?
On a high-bay warehouse or logistics center, the position of translucent daylight bands is defined with Danpal per project, not taken from a standard rule. Danpal's technical department works with the architect to define which panels suit which loads and wind conditions and what percentage of light transmission the design requires, so the floor plan and the operation are inputs to that definition.
Danpal systems a team may review for each envelope zone, each to be confirmed with Danpal for the project:
- Facade bands: the Danpal Facade System with Danpalon panels, a single-glazed translucent façade system.
- Insulated facade zones: the Danpatherm K7 and Danpatherm K12 double-glazed façade cassettes, where insulation is balanced against light transmission.
- Roof strips: Danpal roofing systems, including the Danpatherm RK7 double-glazed roofing system. Where strips meet a roof from another supplier, the interface must be detailed and confirmed with Danpal per project.
Sharing the layout early lets Danpal's technical team define the system against the actual floor plan.
What does a translucent façade system include beyond the panel itself?
A translucent façade system is more than a set of panels. The components beyond the glazing panel govern how the wall performs. In a Danpal system the Danpalon panel is one component among several, and each has its own attributes to specify.
- Glazing panel (Danpalon): a multicell polycarbonate panel with internal walls rather than solid material, available in a range of thicknesses, colors and finishes. Thickness and color set light transmission and solar heat gain. Both are published per color and thickness band and are indicative within production tolerances.
- Standing seam: the raised seam along the panel edge. Panels are joined by mating their standing seams and capping them with a connector, which forms a system panel rather than a sheet. Danpal pioneered this approach, and it became the industry standard.
- Connectors: dedicated system components that cap the mated seams and join panel to panel, giving the assembly high air and water tightness.
- Edge profiles: these define how the glazed field meets the structure. Danpal's façade assemblies have been tested with the NM edge profile and with the thermally broken AirPT edge profile.
- Cassettes: Danpatherm K7 and Danpatherm K12 are double-glazed façade cassettes, and K12 is specified with or without translucent insulation. Danpatherm RK7 is the double-glazed roofing system, a separate product.
- Fixings and brackets: these carry loads back to the structure and create point thermal bridges.
Panel-level and system-level figures are read separately. A panel Ug describes the glazing alone. The wall U-value must add the linear bridges at connectors and edge profiles and the point bridges at fixings, and it should be confirmed for the configuration specified. Reaction to fire is classified per panel, and system classification depends on the complete configuration and market. Danpal publishes the average system weight of its Danpal VRS ventilated rainscreen system, panels plus connectors, as 4.5 kg/m² on a 900 mm installation module with 16 mm panels.
How does a translucent façade differ from glazing on a warehouse wall?
A translucent façade and conventional glazing on a warehouse wall do different jobs. One spreads diffuse daylight across the floor, and the other provides a view through the wall. "Translucent" here means light-transmitting but not see-through: daylight passes, but the sightline does not.
Which criteria decide the choice on an industrial wall?
- View requirement: does anyone need to look out at that point in the envelope, such as a dispatch office, a gatehouse or a reception? If so, glass is the answer at that point before any other criterion is weighed.
- Daylight distribution: a multicell panel, built from multiple internal walls rather than solid material, diffuses light across the panel field.
- Supporting structure: glass is heavy and brittle and needs far more supporting structure. Lighter light-transmitting systems reduce that burden.
- Installation: Danpal supplies pre-assembled cassettes that simplify the contractor's work and reduce installation time.
- Thermal behavior: compare at assembly level, name the panel or cassette, and confirm the figure for that configuration rather than relying on one headline value.
| Option | View through | Material behavior | Supporting structure |
|---|---|---|---|
| Conventional glass glazing | Yes, transparent | Heavier and brittle | More supporting structure |
| Danpal system with Danpalon panels | No, translucent | Lighter and not brittle | Less supporting structure |
Danpal's recommendation follows these criteria: glass where a view through the wall is needed, its own systems in most cases where the need is natural light, and a well-designed building can use both.
How do translucent façade panels behave in strong sun, heat and over years of service?
In an industrial envelope, translucent façade panels respond to strong sun in two main ways: solar heat gain and ultraviolet exposure. A multicell panel, extruded with internal walls rather than solid material, diffuses light. Light transmission (the share of daylight a panel passes) and the Solar Heat Gain Coefficient, or SHGC (how much solar energy it admits), move together. Clear panels transmit more daylight and admit more solar heat, while Reflective Grey transmits less light and admits less solar heat than clear. A daylight target is therefore always a paired target. The published figures belong to a specific color and thickness band, are indicative, and may change within manufacturers' production tolerances. A specification that fixes light transmission but leaves SHGC open controls how bright the building will be but leaves how hot it gets to chance.
| Do this | But watch out for | Mitigation in the same decision |
|---|---|---|
| Set a light-transmission percentage for the daylight brief | The same choice sets solar gain | Specify color, thickness band and SHGC together, per configuration |
| Rely on the panel's UV-absorbing protective layer | UV performance depends on its quality, concentration and layer thickness | Ask for the aging test data behind the specific panel |
On long-term appearance, Danpal's published glazing-materials data gives three test results. Danpalon changes color by no more than 3.0 units Delta E after 60 months, measured to ASTM D2244. It yellows by no more than 10 points on the yellowing index over the same 60 months, measured to ASTM D1925. Its light transmission will not decrease by more than 6% after 10 years, measured to ASTM D1003. Service-life statements should be read as estimates tied to a named panel and exposure test, not as a property of the material in general.
Frequently Asked Questions
Which is right for a distribution center: glass or a translucent daylight system?
Decide zone by zone, using the view-requirement test in the comparison section above. Compared with glass, Danpal cites advantages for polycarbonate in weight, installation complexity, safety and thermal insulation, which matter most where daylight rather than a sightline is the brief.
How much daylight does a double-glazed cassette envelope actually transmit?
Light transmission is a design parameter set per project, together with loads, wind and solar gain. It is not a fixed property. Danpal's published product data for Danpatherm gives light transmission of up to 30% for the Danpatherm K7 and up to 24% for the Danpatherm K12 double-glazed façade cassette with insulation. Translucent insulation lowers the cassette's thermal transmittance but also reduces how much daylight it passes, so the two must be balanced for the chosen configuration.
What happens to the panels after years of sun on a warehouse wall?
The CSTB technical appraisal DTA 2.1/12-1530_V5 has a stated validity window of 4 November 2025 to 31 October 2026. It appraises one process, Danpalon cladding in France. It records that the polycarbonate raw-material systems used to make Danpalon panels carry the QB51 "Système de Matières Polycarbonate" quality mark, and that CSTB follows up panel manufacture at the QB51 frequency. For those compositions, UV-aging tests found the UV-absorbing protective layer satisfactory. Together with in-service experience of similar products, the appraisal finds it able to limit color change and loss of mechanical properties for at least 10 years in good conditions. Separately, accelerated aging of the Danpalon 12 MC Crystal panel, reported by CNEP in report R2013-436, returned an estimated lifetime of 20 to 25 years.
Can a light-transmitting envelope meet fire requirements on an industrial building?
Fire classification is set per panel, per system configuration and per market, so it has to be checked for the project. In mainland France, Danpal's translucent façade cladding of Danpalon multiwall panels is the subject of Document Technique d'Application DTA 2.1/12-1530_V5, "DANPALON Bardage". CSTB published it through the CCFAT Avis Technique procedure, and Everlite Concept, Danpal's French subsidiary, holds it. Its stated validity window is 4 November 2025 to 31 October 2026. It appraises that one process in France. The appraising Specialist Group concluded favorably on fitness for use on industrial, agricultural, commercial, school and sports buildings in mainland France. The document records a B-s1, d0 reaction-to-fire classification under NF EN 13501-1 for the 8 to 35 mm multiwall panels it describes.
Will the joints hold up to wind-driven rain and hail?
Danpalon panels join edge to edge through a standing seam and a connector, with dedicated system components. This gives the assembly high air and water tightness and its capacity to carry wind and snow loads. Danpal's published Danpalon glazing-material data reports two test results. Under ASTM E-331, panels provided within a complete Danpal system showed no water penetration at a test pressure of 15 psf. Tested to ASTM E-822-81, a panel repelled 25 mm hailstones traveling at 21 m/sec with no penetration.
What can a design team download at concept stage?
Danpal publishes BIM objects on BIMobject for the Danpal Façade System, the Danpal VRS System, the Danpatherm K7 and K12 cassettes, the Danpatherm RK7 roofing system, Controlite Roof and the Aura louver. It also publishes objects for Danpalon colors and finishes, including Softlite and Iridescent, and for 3DLITE panels. Danpal's technical team works directly with the architect on drawings and the specification document. It stays with the project through supply, installation training and support on site.
About this article
Danpal publishes this article under its own name and is responsible for its accuracy. Articles are researched and drafted with AI assistance and approved by Danpal before publication; publication and update dates reflect substantive edits, not automated refreshes. Last updated: 2026-11-10