How to Specify Aluminum Sun Louvers Before Finalizing the Facade

Blade profile is only one part of a louver system; orientation, spacing, supports, joints, and access determine how it performs on the facade.

A louver elevation can look simple in a rendering: one profile, repeated at regular intervals. The installed system has to resolve much more. Solar orientation, outward views, window cleaning, brackets, structural movement, drainage paths, corners, doors, and facade tolerances all affect the final layout.

The right time to discuss aluminum sun louvers is before the elevation is frozen. Once the blade rhythm has been presented to the client, changing the support zones or spacing can be difficult without changing the character of the facade.

Write the brief before choosing the blade

First decide what the louver is expected to do. The priority might be solar control, privacy, visual screening, architectural depth, or a combination of these. Each objective leads to different choices in orientation, projection, spacing, and position relative to the glazing.

Avoid treating one blade angle as a universal answer. Facade direction, latitude, seasonal sun path, surrounding buildings, glazing, interior daylight targets, and the required view all matter. Where the project has measurable energy or daylight goals, use project-specific analysis and agree on the calculation method. A product description alone cannot verify building-level performance.

Test orientation and spacing from inside and outside

Horizontal blades, vertical blades, and inclined arrangements create different sightlines and shadow patterns. Review the facade from the principal external approaches, then check the view from occupied rooms. A spacing that looks refined on the elevation may block an important view or create an unexpected band across eye level indoors.

Use enlarged elevations and sections to show blade centers, projection, angle, distance from glazing, and the relationship to window mullions. At corners and returns, decide whether the rhythm wraps continuously, stops at a defined edge, or changes direction. None of these details should be left as an unmarked gap on the drawing.

Develop the support strategy with the facade layout

Brackets and carrier lines are part of the architecture, even when the intention is to make them visually quiet. Their positions need to work with the slab edges, mullions, secondary steel, waterproofing, and other facade components. Confirm where loads are transferred and who is responsible for the supporting structure.

Blade length and joint positions also require coordination. Long uninterrupted lines may suit the elevation, but manufacturing limits, transport, thermal movement, structural deflection, and installation tolerances can require joints. Set a consistent joint rule and align it with the building grid or window modules where possible. Final wind and structural design must be completed for the actual project location and system configuration.

Resolve openings, services, and maintenance access

Doors, vents, signs, cameras, lights, drains, and facade-access equipment interrupt the louver field. Draw these conditions early. A blade that ends abruptly beside a door or conflicts with a maintenance route can make a carefully composed elevation look improvised.

Cleaning and replacement should be discussed at the same time. Check the distance from glazing, safe access method, removable components, fastener access, and the sequence for replacing a damaged blade. If maintenance can only happen after dismantling a large area, the detail needs another review.

Select the finish for exposure and approval

The linked SEASON reference profile is listed as a 45 × 200 mm aluminum aerofoil louver with a 1.2–3.0 mm thickness range. Published finish options include powder coating, PVDF coating, pre-painted surfaces, and transfer printing, with white, wood-grain, and RAL colors shown as options.

Treat these as available ranges rather than a complete specification. The project team should confirm alloy, wall thickness, temper, fixing details, coating system, color tolerance, gloss, and documentation for the actual environment. A wood-grain image or color chip is not enough for a large facade. Review an agreed physical sample, and consider a mock-up that includes a joint, bracket, corner, or window interface.

Information to include in a sun-louver RFQ

· Facade elevations and sections, project location, orientation, and principal viewing directions.

· Louver objective: solar control, privacy, screening, architectural expression, or a defined combination.

· Blade profile, orientation, projection, angle, center-to-center spacing, and distance from glazing.

· Proposed material, wall thickness, alloy or engineering requirements, and finish reference.

· Support zones, bracket concept, substrate information, movement joints, corners, and returns.

· Local design criteria and any required structural, wind, energy, or daylight calculations.

· Cleaning method, maintenance access, replacement strategy, and site-handling constraints.

· Required quantity, delivery destination, schedule, samples, mock-ups, and documentation.

A useful quotation depends on more than a profile name and square-meter quantity. The information above allows the supplier and project team to identify missing interfaces and compare alternatives on the same basis.