Designing Shade Before Changing the Glass

The sun does not meet every façade equally

High midday sun and low morning or afternoon sun require different responses. Horizontal overhangs can be effective when the sun is high. Vertical fins or screens may be more relevant where low-angle rays arrive from the side. Adjacent structures can also provide substantial shade.

A sun-path study can show when a proposed device casts shade across the opening. Even a simple seasonal sketch is more informative than applying the same depth to every elevation.

External, within-system and internal layers

External devices intercept radiation before it reaches the glazing. Between-glass blinds and integrated screens change maintenance and replacement considerations. Interior curtains and blinds control glare and privacy but solar energy has already crossed the glass by the time it reaches them.

Each layer should have a clear job. Combining moderate measures can sometimes preserve daylight and view more comfortably than relying on one dark layer.

Air, access and safety

A screen should not unintentionally block required drainage or ventilation. Leave access to clean both the device and the glass. Check fixings, wind exposure and material compatibility as project-specific technical matters.

• Map shade by hour and season.
• Check the view from seated and standing positions.
• Plan a safe cleaning route.
• Coordinate with opening hardware and insect screens.

Prototype one opening

Where practical, test a representative bay before repeating a solution. Observe it during the difficult time of day, not only when conditions are comfortable. Record glare, surface temperatures, view and ease of operation.

A prototype does not replace technical verification, but it can reveal visual and operational issues that drawings miss.