Bird collision deterrence - corrective actions

The options aren't great. Achieving measurable results is not as simple as putting random stickers on the exterior of the glass.

Window films presenting the 2x4 rule can be applied to the exterior.
You can errect a screening array of some kind in front of the glass. 
Panels of bird netting can be installed stretched taut a few inches away from the glass to absorb the energy of an approaching bird before it would hit the glass. 

Hope this helps!

-Heath

There is a challenge with frit or other strategies to deter birds.  These strategies often disqualify the project from earning VIEWS credit.  Advice on ways to earn both would be helpful.

For a resource on strategies for prevention: https://www.fws.gov/migratorybirds/pdf/management/reducingbirdcollisions...

If the area of glazing continues to experience collisions, then updatingthe pattern on the glazing, for instance an example in the guide is to apply a striped glass pattern, or a dot pattern, external films a coverings, and window netting etc. The stratgies in the guide can be applied as retrofits, some are minimal cost, and others not so much. The focus should be design as prevention, but of course there is likely room for error.

Has anyone had any experience or luck with the Ultraviolet paint? https://flockfree.com/collections/uv-paints-and-gels

I don't know how effective it is but might be a good way to maintain the "clarity" of tha glass to meet views while having something birds can see and avoid.

What's the threat factor for a solar array, roof mounted?

Hi, Zuzanna. You mention a BCTR (Building Collision Threat Factor) rather than a MTF (Material Threat Factor). Are you saying that there are areas of a LEED Pilot Credit 55 compliant building that are experiencing collisions? This could be an area of untreated glass, which is allowed per the credit language. But if you are saying that you are seeing collisions at locations where materials have a good MTF (say 25 or lower) then there are ways to try to address that. But you also have to know that MTF 25 only suggests that 75 out of 100 birds (in a tunnel test for that particular glazing assembly) avoided a collision, and that a number of external factors can heavily influence actual performance. In other words, even high performing glazing assemblies will see collisions occasionally. That said, you are likely limited to retrofit strategies once you have assessed the situation. Replacing actual glazing is costly and is usually not a first choice. There are decals available in patterns that have very good MTF scores (such as Feather Friendly), for example, or strategies that hang internal (if a "fly-through" collision condition) or external (if more of a reflective collision condition) strings such as Acopian Bird Savers (with DIY instructions for shock-cord approaches). There are also films with patterns that can be applied to exterior (more effective against reflection conditions) or interally. You will want to mock up any approach and consider the overall impact to the project, hopefully a holistic approach that fits with the design and enhances user experience while also saving birds. The American Bird Conservancy website has lots of additional info.