LEED

Window Type Geometry Factor Minimum Tvis Height Factor
Sidelighting daylight glazing 0.1 0.7 1.4
Sidelighting vision glazing 0.1 0.4 0.8
Toplighting vertical monitor 0.2 0.4 1
Toplighting sawtooth monitor 0.33 0.4 1
Toplighting horizontal skylights 0.5 0.4 1

Option 2 – Computer Simulation

Demonstrate through computer simulation that a minimum daylight illumination of 25 ftcandles has been achieved in 75% of all regularly occupied areas. Demonstration should be in clear sky conditions, at noon, on the equinox, 30? above the floor.

Option 3 – Daylight Measurement

Demonstrate through indoor light measurements that a minimum daylight illumination of 25 ftcandles has been achieved in 75% of all regularly occupied areas. Measurements to be taken on a 10ft grid. Demonstration should be in clear sky conditions, at noon, on the equinox, 30? above the floor.

How 3M Window Films may apply to this credit

3M Window Films may apply to this credit in a variety of manners. 3M Window Films can reduce both the SHGC and the U value of a window, which would allow larger glazings without affecting energy costs for the building. Also, 3M Window Films allow a customization of visible transmittance. According to the LEED handbook, the number one reason this credit is denied is due to inadequate glare control. 3M Window Films can be used to customize the amount of light transmitted into different areas of the building, providing the most efficient and effective usage of daylighting. The 3M light diffusing Fasara? films can also be an effective way to reduce glare, but retain daylight.

ID Credit (1 pt) Fade Reduction

Innovation Design Credit Intent: Provide design teams and projects the opportunity to be awarded points for exceptional performance above the requirements set by the LEED Green Building Rating System and/or innovative performance in green building categories not specifically addressed by LEED.

How 3M Window Films may apply to this credit

According to a study done by Lawrence Berkeley National Laboratories the causes of fading are 40% UV, 25% heat, 25% visible light, and 10% miscellaneous. 3M Window Films reject 99% of the UV from the sun, can reduce the visible light transmitted depending on the selected film, and also reduce the heat of the building by reducing the SHGC for the window. 3M Window Films will not stop fading but will significantly slow fading from occurring. All 3M Window Films reject at least 40% of the cause of fading (UV), and depending on film choice will effect the heat and visible light effects which is another 50% of the cause of fading. By reducing fading, 3M Window Films can extend the life of furniture and building interiors. By extending the life of products 3M Window Films has reduced the amount of furnishings that may have been diverted to the waste stream, the shipping costs of new and disposed furnishings, and/or the amount of materials required to refurbish the furnishings and building interior. 3M Window Films can extend the timeframe needed to repaint/refinish building interiors/furnishings, thereby reducing occupancy interruptions and increase indoor air quality by minimizing the amount of odor typical refinishing materials may release.

ID Credit (1pt) Environmental quality UV rejection
Innovation Design Credit Intent: Provide design teams and projects the opportunity to be awarded points for exceptional performance above the requirements set by the LEED Green Building Rating System and/or innovative performance in green building categories not specifically addressed by LEED.

How 3M Window Films may apply to this credit

Harmful UV rays are a known contributor to skin cancer. It is well known that sunscreen should be applied when going outside. What is not well known is that a clear single pane window only has an SPF factor of 12, and a clear double pane window an SPF factor of 18. Thus, the window itself is not protecting an individual from harmful UV rays. 3M Window Films are recommended by the Skin Cancer Foundation?. Applying 3M Window Films to a window increases the SPF factor of a window to greater than 1,000. Applying the 3M Window Film significantly decreases the potential harmful effects of UV rays.

ID Credit (1pt) Materials Reuse

Innovation Design Credit Intent: Provide design teams and projects the opportunity to be awarded points for exceptional performance above the requirements set by the LEED Green Building Rating System and/or innovative performance in green building categories not specifically addressed by LEED.

How 3M Window Films may apply to this credit

In the event that credit will not be granted for reusing the glazings for credits MR 1.1 & 1.2, it may be possible to apply reusing the glazings with film added to an innovative design credit. All comments from credit MR 1.1&1.2 above would apply.

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