What is a Brise-Soleil?
A brise-soleil (French: sun-breaker) is a fixed or adjustable shading element on the exterior of a building that blocks direct solar radiation while allowing daylight and airflow to pass through. It is an architectural element that prevents overheating of the building in summer without fully darkening the interior.
How It Works
A brise-soleil takes advantage of the low sun angle in winter and the high sun angle in summer:
- Summer (high sun): the fins or panels block direct solar radiation
- Winter (low sun): the sun shines underneath and heats the building for free
- Always: daylight filters through the openings
Types
| Type | Construction | Advantages |
|---|---|---|
| Horizontal fins | Fixed slats/boards | Simple, no maintenance |
| Vertical fins | Fixed vertical strips | Effective against low-angle side sun |
| Eggcrate (grid) | Horizontal + vertical | Most effective overall |
| Adjustable fins | Motorised or manual | Flexible, always optimal |
| Perforated panels | Punched plate | Aesthetic, modern look |
Costs: DIY vs. Ready-Made
| Option | Cost | Advantages | Disadvantages |
|---|---|---|---|
| DIY (timber) | €150–€400 in materials | Affordable, custom-sized | Time investment |
| Ready-made aluminium | €500–€2,000 per window | Fast, durable | More expensive |
| Motorised systems | €1,500–€5,000 | Flexible, optimal | High maintenance |
Building a Timber Brise-Soleil Yourself
- Calculate the correct fin angle based on your latitude and building orientation
- Fix a frame of aluminium profiles or stainless steel to the facade
- Attach timber or aluminium fins at the correct angle
- Treat timber with a UV-resistant exterior stain or paint
- Check annually for rust, rot, or loose fixings
Related Terms
- Facade
- Roof overhang
- Gutter
- Veranda
- Pergola
- Trellis
—
Plan your project with a complete set of building plans: fredsdiyplans.com