Solar Control Coatings on Architectural Glass: A Designer's Guide

What solar control coatings actually do

Solar control coatings work by controlling how glass handles the sun's energy. Some reflect near-infrared heat back outward, while others absorb a portion of it and release it to the outside. Visible light transmission is kept high enough that the room still feels bright, which is why these coatings are popular on large facades.

It helps to think of the coating as one part of a system. The glass unit, the frame and the shading strategy all influence the final result, so the coating should be selected together with the rest of the envelope rather than in isolation.

Common coating types for architectural glass

Designers usually choose between two broad families: low-emissivity (low-e) coatings that favor thermal insulation, and solar control coatings that focus on heat rejection. Some products combine both properties in a double or triple glazed unit.

• Reflective coatings with a noticeable outdoor mirror effect
• Low-reflectance coatings that keep the glass look more neutral
• Tinted coatings that absorb more heat and suit warm climates

Ask your glass supplier for the technical data sheet of each option so you can compare light transmission and solar factor side by side.

Matching coatings with metal frames and finishes

The frame around the glass affects how heat moves through the facade and how the whole assembly looks. Dark powder-coated steel or aluminum frames absorb more heat and can transfer it toward the glazing edge, so frame colour deserves attention alongside the glass choice.

Finishes matter too. Hot-dip galvanized steel offers strong corrosion protection for exposed elements, while powder coating gives a wide colour range that can be coordinated with a reflective or tinted glass. Coordinating the metalwork and glazing finishes early avoids surprises on site.

Orientation and shading strategy

Not every elevation needs the same coating. South and west facades in Israel receive intense afternoon sun and usually benefit most from strong solar control. North and east elevations may need less, which can save money and preserve more natural light.

Shading devices such as external louvres, pergolas or deep balcony overhangs can reduce the load on the glass itself. Combining a suitable coating with well-designed shading often gives better comfort than relying on glass alone.

Specifying coatings with your fabricator

Clear specifications prevent mismatched results. Include the required light transmission, the solar factor or shading coefficient target, the glass build-up, and the expected frame system. If the glazing sits within a metal structure, share the drawings so the fabricator can confirm clearances, sealing details and fixing points.

Request mock-ups or sample panels when the facade is large or highly visible. Seeing the coating on the actual frame colour under daylight is the most reliable way to check the final appearance before production.

Maintenance and long-term performance

Solar control coatings are generally durable, but they need appropriate handling. Clean with non-abrasive products and soft cloths, avoid harsh chemicals that can damage the surface, and follow the glass supplier's cleaning instructions. Regular inspection of seals and frame finishes helps the system keep performing as designed.

• Check sealant condition each year
• Clean facades with recommended products only
• Inspect powder coating and galvanized surfaces for damage

Frequently asked questions

Does a solar control coating reduce all heat from sunlight?

No coating blocks all solar heat. It reduces the portion that passes through the glass, and the exact reduction depends on the product and the glazing build-up.

Will a coated glass still give enough natural light?

Many solar control coatings keep high visible light transmission, so rooms stay bright. Check the light transmission value on the product data sheet before deciding.

Can I use solar control glass with any frame colour?

Frame colour influences heat absorption at the glass edge, so it should be coordinated with the glazing. Discuss the combination with your fabricator and engineer.

Who should confirm the exact glass and coating specification?

The glass supplier and the project engineer should confirm the exact values and standards for your project. Your metalwork fabricator can help coordinate the frame and fixing details.

Common mistakes to avoid

Choosing the coating from appearance alone and ignoring orientation is the most frequent error. Specifying glass without coordinating the frame colour and finish can also lead to unexpected heat and visual results.

Our recommendation

Decide the coating by elevation rather than applying one product across the whole building, and review a physical sample against the actual frame finish in daylight before ordering.

Summary

Solar control coatings reduce unwanted heat gain while keeping daylight, and the best results come from selecting glass, frame and shading together.

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