Bird Friendly Glass
Bird collision with building glass facades occurs across North America and is the major cause of bird mortality, claiming the lives of millions of birds each year. The magnitude of the problem is such that an important trend has emerged to make buildings more bird friendly.
The need for buildings to be less threatening to Wildlife is also part of emerging green strategies. The US Green Building Council’s Leadership in Energy and Environmental Design (LEED) recognized this by adding Credit 55: Bird Collision Deterrence, to their Pilot Credit Library in October 2011. The key component of this credit is the quantification of the threat level to birds on different glazing materials.
With the understanding that birds are able to see light in the ultraviolet spectrum, Bear Glass has developed our Bird-Friendly Glass.
The glass has a patterned, UV reflective coating making it visible to birds while remaining virtually transparent to the human eye. Our glass has been tested in cooperation with the American Bird Conservancy resulting in a significant reduction of bird strikes compared to standard double-glazing.
The 2x4 Rule
Glass surface treatments that reduce significantly the risk of bird collision have been researched by many experts such as Dr. Martin Rössler, Dr. Daniel Klem and Dr. Christine Sheppard. Their conclusions have consistently shown that most birds will not fly into surfaces that have two inches or less of untreated horizontal space or four inches or less of untreated vertical space. This criteria is commonly referred to as the “2x4” rule.
Benefits of Walker TexturesTM AviProtek
- Full surface etching on either side of the glass
- Patterns etched on the outside surface of the glass, offering an optimal combination of viewing areas and attractive bird safe designs meeting the 2x4 rule
- Excellent “threat factors”, ranging from 5 to 29.8 on position 1
- Effective both from a direct or angled view
- No significant impact on the level of visible light transmission
- The resistance properties of the closed pore surface of acid-etched glass are equivalent to unetched glass and offer the only suitable solution for treatment on the outside surface
- Can be combined with energy efficient glass, in a double glazed unit