nucor daylighting - kemp...

Nucor DaylightingHIGH PERFORMANCE PRISMATIC SKYLIGHTS

Daylighting Saves MoneyElectric lighting accounts for 40-50 percent of the total electrical energy consumption in commercial buildings. For many institutional and commercial buildings, strategic daylighting can reduce total energy costs by as much as one-third.

By generating waste heat, electric lighting adds to the loads imposed on a building’s mechanical cooling equipment, all while producing green-house gases. Sunlight, on the other hand:

• Costs $0 to produce• Contributes no greenhouse gases to the environment• Performs at 100 percent on the Color Rendering Index (CRI)• Will be with us for at least another 5 billion years

Daylighting Helps PeopleBringing natural light into workplaces, retail stores, and schools provides benefits beyond energy savings. Compared to facilities relying solely on commercial lighting:

• Retailers report up to 40% better sales in daylit stores.

• Daylighted schools see 20-26% improvement in academic function.• Offices report 10-25% better worker performance, reduced

absenteeism and significantly better morale.

WHAT’S THE BRIGHT IDEA?

Daylighting is the controlled admission of natural sunlight into a building via diffused skylights. Done correctly, it can save energy and money by reducing the need for electric lighting during daylight hours without causing heating or cooling problems.

Before with Electric Lights OFF

Daylighting (with electric lights OFF) Roof with Cut InsMetal Building

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The Best in DaylightingAs the industry leader in engineered-building technology, Nucor Building Systems offers high-performance daylighting components for new construction and retrofits. Designed to bring natural light into engineered steel buildings and other structures, Nucor daylighting systems enable building owners to harness the sun so that electric lights can be dimmed or turned off for a portion of the day while making the interior more pleasant for occupants.

Adding natural daylight to your building projects is a bright idea. To help you do it the right way, Nucor offers high-performance prismatic skylights and daylight-responsive lighting controls that enhance your project while brightening your sales.

Daylighting Is More Than Just Skylights Daylighting integrates energy-efficient lighting and a daylight-responsive lighting control system.

TIAX Controls and Diagnosis Report found that dimming electric lights in daylit spaces could reduce annual lighting energy consumption in existing commercial buildings by 40 to 60 percent (New Buildings, 2001, New Buildings, 2003).

According to Jon McHugh, PE, LC, and technical director with the energy consulting and research firm, Heschong Mahone Group, Inc., America could reduce its peak load electrical demand by 24,000 megawatts just by daylighting existing buildings. The savings is equal to 24 1,000-megawatt nuclear power plants or 48 500-megawatt coal-fired power plants, all at 1/20th the cost of solar photovoltaic panel arrays.

WHAT’S THE BRIGHT IDEA?

Electric Lighting

Roof with Cut Ins Daylighting (with electric lights OFF)

Nucor is pleased to work closely with Acuity Brands as they are the leaders in providing products to support daylighting systems consisting of lighting, lighting controls and skylights. Acuity’s Sunoptics brand is the leader in providing high-performance prismatic skylights.

Conventional Construction

Daylighting Components:• Skylights and windows• Energy-efficient lighting• Lighting controls

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Problem: Hot Spots Clear skylights produce hot spots, glare and UV damage to the building.

Problem: Limited LightStandard white bubble skylights knock down light transmission in order to achieve diffusion.

Solution: Prismatic SkylightHigh-performance prismatic skylights maximize light transmission while still providing 100% diffusion.

Why Prismatic?Traditional skylights do a poor job of dispersing the sun’s rays, causing hot spots, glare, UV damage and uncontrolled heat. By completely diffusing incoming sunlight, Nucor’s prismatic skylights refract the light into micro light beams, spreading the sun’s bright, natural light throughout the space. This reduces the sun’s intensity without compromising daylighting effectiveness.

With at least 4,000 tiny prisms per square foot of glazing layer, Nucor’s offering of prismatic skylights provides 100 percent diffusion and transmits 35 percent more light than conventional skylights while producing:

• No hot spots• No glare• No UV damage to merchandise or furnishings

The high-performance design has no moving parts and catches up to 20 percent more light at low sun angles than standard shapes and are 50 percent stronger than required by any building code. Prismatic skylights also maintain visible light transmission (VLT) for more years of light compared to other products. Modern prismatic skylights transmit more light than conventional skylights while diffusing 100

percent of the incoming rays. This soft yet full-spectrum light creates a pleasant environment while reducing lighting costs.

Advanced Daylighting SolutionsPrismatic skylights can minimize the need for electric lighting during daylight hours.

THE PRISMATIC CONCEPT4

Hail DamageHail is a form of solid precipitation. It consists of balls or irregular lumps of ice, each of which is called a hailstone. Hailstones larger than 2 cm (0.80 in) are usually considered large enough to cause damage. Hail rarely is life threatening, but can cause major damage.

Annually, hail causes more than $1 billion in damages to crops and property in the United States, according to the National Oceanic and Atmospheric Association (NOAA).

Although hail damage is less expensive per claim than fire losses, hail damage is more widespread. A large hailstone falling from the sky can reach speeds of 100 mph before it makes impact.

The best way to prevent hail damage is to make sure your building’s roof and roof components are as impact resistant as possible.

Today’s roofing materials are rated and divided into four classes.

Each class is defined by how well the products withstand hailstones of various sizes in diameter:

• Class 1: 1.25 inches • Class 2: 1.5 inches• Class 3: 1.75 inches• Class 4: 2 inches

Nucor metal roof panels and the Nucor Integrated Prismatic Skylight all meet a Class 4 impact rating. Nucor Curb Mounted Prismatic Skylights meet a Class 3 impact rating as standard.

In a study by Daniel Munson and Gloria Molina of CDS Business Mapping, LLC, hail events were tracked for 20 years from the period 1990-2010. The chart below summarizes a distribution of hail sizes found.

THE PRISMATIC CONCEPT

Distribution of Hail Sizes 1990-2010

Range Size (inches)

Number of Events

Percentage of Total

Cumulative Percent

<.75”.75 < 1”1” < 2”2” < 3”3” < 4”4” - 8”

TOTAL

316 110,104 101,048

9,185 841 952

222,446

0.14%49.50%45.43%

4.13%0.38%0.43%

100.00%

0.14%49.64%95.06%99.19%99.57%

100.00%

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Nucor CFR™ Integrated Prismatic SkylightNucor Building Systems worked closely with Sunoptics in co-developing this unique integrated skylight.

Nucor’s CFR™ Integrated Skylight is the ideal solution for daylighting in new construction. Factory manufactured and shipped as a complete unit, the Nucor CFR™ Integrated Prismatic Skylight is mounted to a trapezoidal steel panel that is seamed with the rest of the roof.

Specification SummaryMaterialTop Lens PolycarbonateBottom Lens Polycarbonate

Ratings Solar Heat Gain Coefficient (SHCG) 0.42Variable Light Transmission (VLT) 0.64U Factor 0.74Impact Rating Class 4Rate of Burn CC1

Warranty5-year limited warranty due to manufacturer defect

Product Attributes:• Factory manufactured and shipped

as a complete unit• Mounted to trapezoidal panel• Seamed with the rest of the roof• Double glazed• Class 4 impact rating• Polycarbonate over polycarbonate

Class 4 Impact Rating StandardEngineered to withstand severe weather conditions, Nucor’s Integrated Prismatic Skylight features a double-glazed prismatic lens that achieves a Class 4 Impact Zone rating.

CC1 Fire RatingThe Integrated Prismatic Skylight achieves a CC1 fire rating. This refers to plastic materials that have a burning rate of 1” (25 mm) or less when tested in nominal 0.060” (1.5mm) thickness.

DAYLIGHTING PRODUCTS6

DAYLIGHTING PRODUCTS

Optional Fall ProtectionThe unique, relatively compact design of the Integrated Skylight, utilizing two layers of tough Class 4 Impact Rating polycarbonate, makes it one of the strongest skylights on the market. Under third-party testing, it easily passed a 400-pound static test as well as drop testing of 300 pounds at 3 feet and 200 pounds at 5 feet. OSHA states, in an interpretation of the standard for safeguarding an opening, that “a plastic skylight which can provide the necessary structural integrity to support the 200-pound load would not be required to be further safeguarded.”

Should you require additional fall protection for high-roof traffic areas, this is easily achieved with externally mounted metal screens that simply clamp to the standing seam ribs after the original installation is complete. These products are readily available from several suppliers throughout North America. Contact our customer service teams for additional information.

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Curb Mounted Prismatic SkylightThe patented Signature Series dome skylight by Sunoptics is designed to optimize lighting performance even at low angles – with no moving parts – compared to competitive daylighting products. The resulting performance provides better quality light for the maximum hours per day, thus maximizing energy savings by greatly reducing electric lighting use.

The skylight uses the highest UV-resistant materials available. This ensures high visible light transmission for the life of the product. Based upon scientific data from ASTM testing, this skylight will not reach a Y-20 on the yellowing scale during its life. Any yellowing below Y-20 is not visible to the naked eye.

The Curb Mounted Prismatic Skylight can be used in new construction and in retrofit applications.

The lens is double-glazed with acrylic over acrylic. The prismatic dome is sealed with a silicone and urethane seal between the prismatic lenses before it is fully welded with encapsulating and insulated thermal break. No exposed metal, pre-installed foam curb gasket and curb weather sweeps mitigate condensation concerns. This frame then sits on a curb and is screwed in with stainless steel screws with rubber washers.


Specification SummaryMaterialTop Lens IM AcrylicBottom Lens IM Acrylic



Class 3 Impact Rating StandardEngineered to withstand severe weather conditions, Nucor’s Curb Mounted Prismatic Skylight features a double-glazed prismatic lens that achieves a Class 3 Impact Zone glazing rating. FM Approved or High Velocity Hurricane Zone (HVHZ) skylights are available upon request.

CC2 Fire RatingNucor offers Curb Mounted Prismatic Skylights with a CC2 fire rating. This refers to plastic materials that have a burning rate of 2.5" per minute (1.06 mm/s) or less when tested in nominal 0.060" (1.5mm) thickness.

Standard SizesSize ID Frame Call-Out4080 52 1/4" x 100 1/4"5060 63 5/8" x 75 5/8"20100 27 1/4" x 123 1/4"4040 51 1/4" x 51 1/4"

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Wade Through The Hype Demand The Best

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3. PRE-INSTALLED FOAM CURB GASKETProtects against moisture infiltration.

1. PRISMATIC LENS DESIGN & PERFORMANCE100% diffusion (haze) allows for even coverage with no hot spots or glare.

4. AAMA-CERTIFIED 800MD FRAME DESIGNFully welded with encapsulating and insulated thermal break. No exposed metal to avoid condensation from thermal bridging through the frame.

2. INTEGRATED CURB WEATHER SWEEPDesigned to prevent wind-borne debris and moisture infiltration.

LEED®The use of Nucor Building System’s Prismatic Skylights in buildings design provides opportunities for a project to earn credit toward Leadership in Energy and Environmental Design (LEED®) points. The LEED green building certification program is the nationally accepted benchmark for the design, construction and operation of green buildings, and provides a complete framework for assessing building performance and meeting sustainability goals. Based on well-founded scientific standards, LEED emphasizes state-of-the-art strategies for sustainable site development, water savings, energy efficiency, materials selection and indoor environmental quality.

It is advantageous to design the building envelope, HVAC, lighting, and other systems to maximize energy performance. Installing Nucor Prismatic Skylights along with lighting controls to maximize energy efficiency through reduced electric lighting use can easily help designers in achieving and exceeding minimum energy efficiency standards.

For more information on how your building may qualify for LEED points as a result of Daylighting, please contact your Nucor representative.

Source: U.S. Green Building Council (2009), LEED 2009 New Construction and Major Renovations. LEED® is a registered trademark of the U.S. Green Building Council

All Curb Mounted Skylights Feature High-Performance Design, Including:

• Fully welded, AAMA-certified 800MD frames with encapsulating and insulated thermal break; there is no exposed metal so condensation from thermal bridging is minimized

• Pre-installed foam curb gasket protects against air and moisture infiltration

• Integrated curb weather sweep that prevents wind-borne debris and moisture from entering

• Exterior weeping gutter• Prismatic lens design and performance• Meets and exceeds glazing load requirements worldwide

Optional smoke vent available.

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Smoke & Heat Vent SkylightSmoke and heat vent skylights are rooftop venting systems typically used in manufacturing and industrial buildings, warehouses, and retail stores. They automatically open, releasing heat, smoke, and noxious fumes during a fire, as required by building code section 910.

Nucor Smoke Vents are UL and/or Factory Mutual Rated (curb mounted design) and are fully glazed ready for installation. Smoke vent frames shall be fabricated from 6061-T6 aluminum with a natural mill finish. Frames have integral condensation and weepage gutters, which drain interior moisture to the outside.

Smoke vents operate by a fusible link with a minimum temperature rating of 165 degrees. The fusible link mechanism with gas shocks includes an exterior manual release cable for testing. Smoke vents open to a minimum angle greater than 90 degrees. Nucor Smoke Vent Skylights are double glazed using SR40 100% Impact Modified Clear Prismatic or Polycarbonate over SR25 White Prismatic lens, CC1 Rated, glazed in a Signature Series Dome configuration.

Class 4 Impact Rating RequirementsIce Ball Size Diameter 1 3/4” (44.5 mm)Kinetic Energy Target ft.-lb. (j) 14.95 (20.3 j)Kinetic Energy +10 ft.-lb. (j) 16.5 (22.4 j)


Standard SizesSize ID Frame Call-Out4080 52 1/4" x 100 1/4"5060 63 5/8" x 75 5/8"

Specification SummaryMaterialTop Lens PolycarbonateBottom Lens Polycarbonate



Class 4 Impact Rating StandardEngineered to withstand severe weather conditions, Nucor’s Smoke Vent Prismatic Skylight features a double-glazed prismatic lens that achieves a Class 4 Hail Zone glazing rating.

CC1 Fire RatingThis smoke and heat vent skylight achieves a CC1 fire rating. This refers to plastic materials that have a burning rate of 1” (25 mm) or less when tested in nominal 0.060” (1.5mm) thickness.

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SHGC, U-Factors & R-ValuesHeat Gain and Loss from windows, doors, and skylights can occur through:

• Direct conduction through the glazing, frame, and/or doors• The radiation of heat into a building (typically from the sun) and out

of a building from room-temperature objects, such as people, furniture, machinery and interior walls

• Air leakage through and around them

When windows and skylights are rated for energy efficiency, the rate of non-solar heat that passes through is quantified as the U-factor, as opposed to SHGC, which quantifies the rate of solar heat that passes through the window. SHGC and U-factor ratings are specific to windows and skylights and measure properties different from insulation R-values, which are used to quantify the insulating capabilities of building materials used elsewhere in a building, such as insulation behind walls, under floors, in the roof, etc. These different values are each designed to measure very specific properties, which is helpful when examining the individual factors that can all be addressed to improve the energy efficiency of a whole building.

U-factor is the rate at which a window, door, or skylight conducts non-solar heat flow. The lower the U-factor, the more energy-efficient the window, door, or skylight.

Solar Heat Gain Coefficient (SHGC) is the fraction of solar radiation admitted through a window, door, or skylight – either transmitted directly and/or absorbed, and subsequently released as heat inside a building. The lower the SHGC, the less solar heat it transmits and the greater its shading ability. A product with a high SHGC rating is more effective at collecting solar heat during the winter. A product with a low SHGC rating is more effective at reducing cooling loads during the summer by blocking heat gain from the sun.

How much daylighting is enough?Most building codes will require between 2% and 5% of roof area to be used for daylighting. Dark spots are often created below 2%, and the cost benefit advantages decline above 5% where electric light savings peak. Although local codes or design requirements vary, the numbers below are a rule of thumb for consideration.

Daylighting Roof Area % Per Building Use


Building Type Optimum % Warehouse/Logistics 2 - 3%Manufacturing 3 - 4%Schools/Office 4 - 5%Retail 4 - 5%Overall 5%

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Nucor Roof CurbNucor’s new Roof Curb system enables lightweight roof accessories such as skylights and smoke vents to be installed with virtually any Nucor roof panel, including standing seam, through-fastened and insulated roof panels. This engineered system can be installed in either new construction or in a retrofit application. Steel lined with an insulated curb wall, it requires no secondary framing, reducing total curb installation weight. The elimination of secondary framing results in significant savings not only in material but also in engineering, detailing costs and erection labor.

Pre-punched holes are provided around the perimeter of the curb, taking the guesswork out of fastener spacing, and assuring optimum weathertightness. Internal fastening along the roof curb sides limits the number of fasteners exposed to the elements. Curb exteriors are either painted to match roof panel colors or are primed with galvanized paint. Interior surface custom color trim is available upon request. In keeping with Nucor and Nucor’s culture of Safety First, all Nucor Roof Curbs include OSHA compliant as standard.

Standard SizesSize ID Frame Call-Out4080 52 1/4" x 100 1/4"5060 63 5/8" x 75 5/8"20100 27 1/4" x 123 1/4"4040 51 1/4" x 51 1/4"

Features:• Does not require secondary framing

members installed between the purlin/joist members.

• Allows for expansion and contraction while resisting uplift.

• 14 gauge support channels are designed to resist live loads and provide a rigid backer for curb attachment.

• Curb height is 7".• Mitered and fully welded corners.• Fully welded water cricket with a

1" splash lip.• No special detailing required.• All curbs are insulated as standard.• OSHA-compliant fall protection

is standard.• Can be used for new construction

or retrofit applications.• Interior side fasteners improve

weatherability and aesthetics.

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Lightweight Framing System Saves Time & Money

Interior side-fastening provides a clean appearance and improves weatherability.


Integrated Safety FrameA unique feature of Nucor’s Roof Curb System is the safety/security frame. Developed by Nucor engineers, this grid incorporates welded grating, which demonstrates our commitment to innovative solutions.

Nucor’s Roof Curb SystemAlthough choosing a roof curb designed for your specific metal roof profile is critical, it is only part of a quality roof curb system.

The definition of a system is “a collection of interacting, interrelated components resulting in predictable, consistent, positive performance.” Put simply, a successful roof curb system is one of the key barriers against the elements for any building. It’s essential that every component is of the highest quality, able to withstand severe weather conditions over a long period of time.

Roof Curb System ComponentsAll our standard roof curbs are shipped with mastic, tube sealant, fasteners, rib covers and insulation conveniently packaged with each individual curb, so no time is wasted searching for small parts around a jobsite.

Mastic – The premium mastic tape sealant is formulated for high performance, elasticity, and superior tack, providing outstanding moisture and mold resistance, and effective corrosion protection for low-movement, mechanically-fixed joints. Its superior surface tack affords tenacious adhesion, even at low temperatures.

Tube Sealant – We provide only premium tube sealant.

Fasteners – Our fasteners have a lifetime warranty against red rust. The cast zinc head provides excellent surface paint adhesion and prevents failure during installation, and its special undercut entraps our EPDM washer even when driven at extreme angles, assuring a waterproof seal.

Rib Cover – Rib covers are manufactured with an injection molded elastomeric polymer that is designed to withstand UV assault, expansion fatigue and cyclic thermal conditions. They’re formed from a single seamless piece, fitting the exact profile of our panels, with factory formed dimples for fastener location, and mastic grooves for maximum waterseal.

Insulation – Each curb includes white fiberglass insulation board with an R-Value of 6.5 as standard. Our roof curbs and safety/security frame are specially designed to accept the insulation, giving it a clean, professional appearance.

Safety/Security Frame – Installation of our skylights is fast and safely consistent by design, thanks to our unique integrated safety/security frame, with the grid welded directly to the frame.

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Fixture-Integrated Wireless Controls for High Performance, Facility-Wide Lighting Management

IndustrialJHBL LED High BayFor unforgiving climates and demanding areas, the JHBL LED high bay is the high-performance, heavy industrial LED solution. This completely die-cast luminaire, with patterned borosilicate glass lens, is built to withstand dust, moisture and airborne contaminants to maintain greater lighting levels. The engineering behind the JHBL’s construction, optics, electrical and thermal management systems allow it to thrive in challenging environments, including high-ambient conditions up to 149°F (65°C).

Manufacturing & WarehouseI-BEAM® LED High BayIdeal one-for-one replacement of conventional high bay systems such as HID and fluorescent. Applications include manufacturing, warehousing and other large indoor spaces with mounting heights up to 60’. These fixtures are suitable for ambient temperatures from -40°F (-40°C) to 131°F (55°C).

Retail & CommercialPROTEON™ SL Linear LED LuminaireThe PROTEON SL professional-grade LED solution was built from the ground up, utilizing the most current LED electronics, precision optics and unique accessories to solve vertical and horizontal illumination and application challenges that have existed for decades. This is an ideal LED lighting solution for suspended applications where quality lighting and architectural form is valued. These fixtures can be used alone or in a continuous-row application.

Energy-Efficient LED LightingNucor’s High-Performance Prismatic Skylights combined with the use of energy-efficient LED lighting offers a significant opportunity for operational energy savings.

LED is the most efficient lighting technology available today. It is estimated by the U.S. Department of Energy that switching to LED lighting over the next two decades could save the country $250 billion in energy costs over that period, reduce the electricity consumption for lighting by nearly one half, and avoid 1,800 million metric tons of carbon emission. Because of the compelling benefits of LED lighting, it is here to stay and will be an important part of the lighting industry for years to come.

Acuity Brands, Inc. is a North American market leader and one of the world’s leading providers of LED lighting solutions for both indoor and outdoor applications. The LED lighting products below are manufactured and distributed by Lithonia Lighting, a division of Acuity Brands.

LIGHTING & CONTROLS14

Lighting Controls Maximum energy savings (up to 75%) are achieved when the lighting system is controlled by both daylighting and occupancy sensors. Experience has shown that in commercial buildings, the manual operation of lights is unreliable and thus an automatic system is required.

Lighting systems in nonresidential buildings operate at full output regardless of outdoor conditions. On most days, however, daylight (sunlight through skylights and windows) can provide sufficient light levels for many activities. The results of not dimming electric lights include occupant eye strain due to excessive light levels and unnecessarily high electricity use for lighting and air-conditioning.

Lighting systems, skylights, windows and HVAC systems need to be designed to take maximum advantage of daylighting. When solar gains are at their highest, the building cooling system can be reduced in size because lights are dimmed to the minimum. Daylighting works best with indirect lighting because occupants are less likely to notice changes in electric light output. Conversely, daylighting control does not work well with spot lighting.

Acuity Brands, Inc. is a North American market leader and one of the world’s leading providers of lighting control solutions. Acuity Brands recommends XPoint™ Wireless for lighting controls in a building.

Fixture-Integrated Wireless Controls for High Performance, Facility-Wide Lighting ManagementPowered by Adura®, a robust and patented wireless technology, XPoint technology is integrated into the luminaire enabling superior lighting management.

XPoint Wireless allows users to group and easily configure individual lights or groups to respond to any sensors, wall stations, or neighboring luminaires. Fixtures store individual time schedules and provide optional electrical current measurement and lamp/driver outage reporting to simplify and reduce lighting maintenance. Given this unique approach of distributed intelligence and control, XPoint Wireless is able to operate without an active gateway or repeater, ensuring no single point of failure.

LIGHTING & CONTROLS 15

INDIANA305 Industrial ParkwayWaterloo, IN 46793(260) 837-7891

SOUTH CAROLINA200 Whetstone RoadSwansea, SC 29160(803) 568-2100

TEXAS600 Apache TrailTerrell, TX 75160(972) 524-5407

UTAH1050 N. Watery LaneBrigham City, UT 84302(435) 919-3100

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