Metal Facade Fins for Solar Control on South-Facing Walls

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Metal facade fins are fixed or adjustable blades mounted on a wall that shade glazing and wall surfaces from direct sun, reducing heat gain while keeping views and daylight. On south-facing walls, horizontal fins are usually the most effective because the high summer sun is easy to block with them. Exact dimensions should be confirmed by the design engineer for each project.

Why south-facing walls need solar control

In Israel, south-facing facades receive strong direct sun for much of the day, especially in summer when the sun climbs high. Glass and exposed walls absorb that heat and pass it into the building, raising cooling loads and making interior spaces uncomfortable. Solar control at the facade level is often more effective than relying on interior blinds, because it stops the heat before it reaches the glass.

Shading is most useful where it blocks the sun when it matters most, not where it blocks daylight in winter. Architects often start by studying the sun path for the site and the orientation of each opening.

Horizontal, vertical and angled fins: choosing the right type

Each fin type responds to the sun differently:

Horizontal fins block high summer sun well and let low winter sun in, which suits south elevations.
Vertical fins work better on east and west faces where the sun is low and comes from the side.
Angled or louvered fins offer a compromise and can be tuned to the project's sun angles.

Your choice should follow a sun study, not habit. We can build any of these in-house to your drawings.

Fixed versus adjustable fins

Fixed fins are simpler, need no maintenance and cost less to install. They are a good choice when the sun angles are well understood and the design can be fully resolved at the drawing stage. Adjustable fins let occupants or a control system change the blade angle through the seasons, which gives more control over daylight and glare but adds mechanical parts that need servicing.

Discuss the trade-off early so that the structure, the fixings and the access for maintenance are designed in from the start.

Materials and finishes for facade fins

Steel and aluminum are the usual materials for exterior fins, and the finish matters as much as the metal. Hot-dip galvanizing gives strong corrosion protection for steel that will face weather and salt air near the coast. Powder coating adds colour options and extra protection. Stainless steel suits prominent architectural details where a clean, low-maintenance surface is wanted.

Choose the material with the environment in mind, not only the look. Ask us to recommend a finish suited to the exposure of your specific wall.

Structure, fixings and integration with the building

Fins carry wind loads and their own weight, so their fixings must be designed with the structure, not added afterwards. Connection points to slabs, columns or the facade system need coordination between the architect, the structural engineer and the metalwork fabricator. Thermal movement of long fins should also be allowed for so that the metal does not buckle or rattle.

Confirm wind and load requirements with the engineer
Plan fixing points before the concrete is poured where possible
Allow for expansion of long members

From drawing to installation at Techno Kol Uzi

Our process starts with your drawings or a brief and photos of the site. We take on-site measurements, then prepare a drawing and a written specification for your approval. Production happens in our factory at 37 Rival Street, Tel Aviv, and finishing such as galvanizing or powder coating is coordinated before delivery. We then handle installation so the fins are fixed correctly to the building.

Because the work is made to measure, each set of fins can match your facade rhythm, spacing and profile exactly.

Frequently asked questions

Are horizontal fins always best for a south-facing wall?

Horizontal fins are usually the most effective on south elevations because they block the high summer sun well. The exact depth and spacing should still be based on a sun study for your building and location.

Do facade fins reduce daylight inside the building?

They reduce direct sun more than daylight, since diffuse light still reaches the glass. Careful spacing and blade angle keep the interior bright while limiting heat and glare.

Which finish is best for fins near the coast?

Hot-dip galvanized steel with a powder-coated finish is a common choice for coastal exposure because it resists corrosion well. We can recommend the right finish once we know the wall's exposure.

Can you build fins to our architect's drawings?

Yes, we manufacture to measure from your drawings and specification, after on-site measurement and your written approval. We can also advise on details that help with fabrication and installation.

Common mistakes to avoid

A common mistake is choosing fin depth and spacing without a sun study, which can leave gaps where the sun still reaches the glass. Another is failing to coordinate fixings with the structure early, so the fins are either weak or difficult to install.

Our recommendation

Run a sun study for the south elevation first, then set the fin depth and spacing from that result rather than from appearance alone. Involve the metalwork fabricator and the structural engineer at the concept stage so fixings and finishes are resolved before construction.

Summary

Well-designed metal facade fins can significantly reduce solar heat gain on south-facing walls while preserving daylight and views. Their performance depends on a sun study, careful choice of type and finish, and early coordination with the structure.

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