LEED & Bristolite
To our Valued Customers, Friends and Associates,
The LEED (Leadership in Energy and Environmental Design) Green Building Rating System
is a voluntary, consensus-based national standard for developing high-performance,
The use of Bristolite Daylighting Systems in green building designs affords our
customers the opportunity to earn credit for LEED points on their projects. Our
integrated daylighting systems and products offer energy savings through the use
of sunlight for daylighting and achieve LEED credits in several of the seven LEED
In terms of energy savings our products contribution are measured by industry standard
measurements of; Visible Light Transmission (VLT). An optical measurement of percentage
of external sunlight directed into the building interior through our skylight glazing
design. Solar Heat Gain Coefficient (SHGC). A measure of heat gain in the interior
of the building as generated by the sunlight our skylights direct into the building
interior and Insulating Values (U Factor/R Value). U Factor being a measure of heat
flow through our skylights in either direction i.e.: external to internal and internal
to external. R Value an assigned insulating value calculated as the reciprocal of
The LEED Green Building Rating System for New Construction and Major Renovation
is comprised of seven sections.
- (SS) Sustainable Sites
- (WE) Water Efficiency
- (EA) Energy and Atmosphere
- (MR) Materials and Resources
- (IEQ) Indoor Environmental Quality
- (ID) Innovation and Design
- (RP) Regional Priority
Each of the above sections carries prerequisites and credit opportunities thus providing
a guideline for building certification.
Following are the primary areas in which the use of Bristolite Daylighting Systems
and products in green building design offer our customers opportunity to earn credits
toward LEED points.
EA - Prerequisite 2: Minimum Energy Performance
INTENT: Establishes a minimum level of energy efficiency for the proposed
building and its systems to reduce environmental and economic impacts related to
excessive energy usage.
Design the building to comply with both:
- The mandatory provisions (Sections 5.4, 6.4, 7.4, 8.4, 9.4 and 10.4) of ASHRAE/IESNA
Standard 90.1 – 2004 and,
- The prescriptive requirements (Sections 5.5, 6.5, 7.5, and 9.5) or performance requirements
(Section 11) of ASHRAE/IESNA Standard 90.1-2004.
- Note: LEED for New Construction projects must exceed the minimum energy performance
requirements of ASHRAE/IESNA Standard 90.1-2004. See EAc1 for the new requirements.
Under this section, to provide the maximum energy performance and achieve the maximum
benefits, the installation of Bristolite’s skylights, in conjunction with an automatic
daylight control system, will reduce the electric daylighting use and can assist
the architect in meeting and/or achieving the minimum energy efficiency standards
required in this section.
EA - ENERGY & ATMOSPHERE (ea) Credit 1: Optimize Energy Performance 1 -19 POINTS
Demonstrate a percentage improvement in the proposed building performance rating
compared to the baseline building performance rating per ASHRAE/IESNA Standard 90-1-2004,
by a whole building project simulation using the Building Performance Rating Method
in Appendix G of Standard. The minimum energy cost savings percentage for each point
threshold is as follows:
Appendix G of Standard 90.1-2004 requires that the energy analysis be conducted
for the Building Performance Rating Method including all of the energy costs within
and associated with the building project.
Bristolite skylights use fully dimensioned glazings. All inside curb dimensions
and glazing viewing areas are true to call out dimensions. Meaning our 5 x 6 skylight
has a true 30 sq. ft. glazing area. Many competitors restrict the glazing area by
as much as 7% to reduce frame and glazing material cost. Additionally our, Triarch
shaped Quasar Prismatic skylights provide 10% more light gathering surface area
than a standard smooth domed skylight. And, more than 20% more than a radical, heavily
volute shaped dome skylight. For maximum light transmission and thermal performance
most Bristolite customers choose our Quasar Prismatic skylights with 70 % to 72%
light transmission and 100% haze for excellent light diffusion. SHGC of .50 and
U Factor of 0.65 and R Value of 1.54. Typically the Bristolite Quasar skylights
out perform our nearest competitor’s skylight with 12% more light and 24% less heat
All together these performance characteristics provide even quality natural free
daylight, properly distributed and diffused, and eliminate “hot spots” and glare
in the building and have shown to reduce electric lighting use by as much as 70%
during daylight hours. And, total building energy use by as much as 35% during daylight
hours. In accordance with ASHRAE 90.1 – 2004, a maximum reduction of energy consumption
will be realized when skylights are used in conjunction with a automatic daylighting
control system, which provides the most effective utilization of natural daylighting.
LEED-NC v2.2 credits and California Title 24 – 2005 – For Projects in California
The USGBC deems Title 24-2005 to be directly equivalent to ASHRAE 90.1-2004 for
projects within the state of California. This equivalency is for the purpose of
certification for the following LEED-NC v2.2 credits:
- Minimum Energy Performance – EAp2
- Optimize Energy Performance – EAc1
- On-site Renewable Energy – EAc2
- Green Power – EAc6
LEED credit will be awarded based on established LEED_NC v2.2 performance thresholds
for EAc1, EAc2, and EAc6. LEED performance thresholds are based on
energy cost savings. When using Title 24-2005, project teams must utilize the appropriate
energy rates to determine the energy cost savings for their respective project.
MR - MATERIALS & RESOURCES Credit 4: Recycled Content 1 - 2 POINTS
Use materials with recycled content such that the sum of post-consumer recycled
content plus one-half of the pre-consumer content constitutes at least 10% (based
on cost) of the total value of the materials in the project. The recycled content
value of a material assembly shall be determined by weight. The recycled fraction
of the assembly is then multiplied by the cost of the assembly to determine the
recycled content value.
Bristolite has been committed to the environment for over
42 years. Reducing the carbon footprint, through maximizing both post-consumer and
pre-consumer recycled content is a companywide culture. Utilizing aluminum components
with an 80% recycled content may contribute towards obtaining these LEED points.
MR - MATERIALS & RESOURCES Credit 5.1 Regional Materials 1 – 2 POINTS
Use building materials of products that have been extracted, harvested or recovered,
as well as manufactures, within 500 miles of the project site for a minimum of 10%
(based on cost) of the total materials value. If only a fraction of a product or
material is extracted/harvested/recovered and manufactured locally, then only that
percentage (by weight) shall contribute to the regional value.
In keeping with the guidelines, Bristolite may contribute
to this point for projects within 500 miles of our manufacturing facility, located
in Santa Ana, CA.
IEQ - ENVIRONMENTAL QUALITY Credit 8.1: Daylight & Views: 1 POINTS
Option 1 – Calculation
Achieve a minimum glazing factor of 2% in a minimum of 75% of all regularly occupied
The glazing factor is calculated as follows:
Bristolite, with the Quasar skylight, or with the structural
glass metal-framed skylights, may provide possible points for this credit. Bristolite’s
skylights provide highly diffused light, without glare or hot spots that enhances
the quality of the building environment.
|Credit 1.1 Innovations in Design
||Possible Points 1
|Credit 1.2 Innovations in Design
||Possible Points 1
|Credit 1.3 Innovations in Design
||Possible Points 1
|Credit 1.4 Innovations in Design
||Possible Points 1
Indentify the intent of the proposed innovation credit, with supporting documents
for each innovative measure, not specifically addressed by the LEED Green Building
Rating System, such as acoustic performance, well being of occupants, etc.
Bristolite’s Quasar Prismatic skylight provide 28 % more
light than many competing skylights and transfer 24% less heat with diffused light
absent of hot spots, glare and the effects of damaging UV. Additionally, Bristolite
is currently engaged in research to commercialize two new technologies associated
with solar heat rejection and super insulation. The combination of these two technologies
in a single glazing design show promise to reduce SHGC (solar heat gain) and U Factor
(heat transfer) by between 50% to 85%; or half to one-sixth that of a typical skylight.
As we continue our testing and analysis we will keep our
LEED customers, friends and associates advised.
We thank our readership for this opportunity to present a brief summary of the LEED
Green Building Rating System and our specific participation. When you compare Bristolite
Quasar Prismatic skylights among our peers in the industry you’ll see why architects,
building owners and managers involved in the retail, municipal, commercial and industrial
markets have relied on Bristolite for over 41 years. Our Daylighting Systems maximize
energy savings while simultaneously increasing retail sales, productivity and occupant
We invite you to contact us for a cooperation when engaged in designing your next
sustainable, energy efficient building project.
Bristolite Daylighting Systems
Note: All requirement, intent, data tables and formulas information contained within
are the intellectual property of LEED.