LO/MIT Resources

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ARTICLES

radiant barrier effect on shinglesRIMA-International Technical Bulletin 103:
The Effect of Attic Radiant Barriers in an Attic Application on Exterior Roofing Materials

The effect of attic radiant barriers on the temperatures of roofing materials is the subject of a recently completed RIMA-I study. Dark roofing material (shingles) can absorb as much as 95% of incident solar radiation and, as a result, will increase in temperature above the surrounding air temperature. The temperature reached by a roof in the heat of the day depends partly on the amount of heat transferred downward into the attic and conditioned space. The installation of an attic radiant barrier significantly decreases the amount of heat transferred in the downward direction with the result that the roof material temperatures will increase. The questions addressed by this bulletin are the magnitude of the temperature increase and the effect of the temperature increase on material warranties. The results of this study are…
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Paint Pro Radiant Barrier CoatingsPaintPRO Archives Vol. 6, No. 5:
Radiant Barrier Coatings

With miles and miles of unpainted attics throughout the country, radiant barrier coatings can be a hot commodity for painting contractors seeking ways to expand their business.

On a sunny summer day, most people’s attics are unbearably hot. It’s estimated that about a third of the unwanted heat that builds up in a home enters through the roof. Conventional thermal insulation can slow down radiant heat transfer, but it will not stop it. The sun beats down on the rooftop, which absorbs the solar energy and heats the roof sheathing, causing the underside of the sheathing and roof to radiate heat downward toward the attic floor. The hot attic also conducts heat to the rest of the house below, making the air conditioner work harder and the electric bill climb higher….
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Metal Building IRCCMetal Architecture:
Using Interior Radiation Control Coating Systems to Insulate Metal Buildings

The green revolution finds the metal building professional (architect, engineer or erector) constantly bombarded with sales literature and technical articles concerning improved methods for insulating structures. Probably the most bewildering are the many paint products that claim to have insulating qualities. ASTM and RIMA (Reflective Insulation Manufacturers Association) have tried to clarify the many claims made by some of these products by setting standards for, and classifying these products as interior radiation control coatings if they meet the criteria of ASTM C1321-04…
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low e vs ceramic PaintsEnvironmental News Network:
A Low Emissivity Coating That Really Works

To say that there is a lot of hype about insulating paints and radiant barrier coatings is an understatement. The Internet is rife with claims of paints that dramatically reduce heat transfer—usually based on some technological magic spun off from NASA. While these products may have some relevance in the extreme conditions of outer space, manufacturers of paints containing “ceramic beads” or “sodium borosilicate microspheres” are making claims that defy the laws of physics—and independent test results—when they claim they can save significant energy in buildings. Well-engineered coatings with metallic particles can reduce radiant heat transfer, however. LO/MIT-II from SOLEC—Solar Energy Corporation has a long track record of success…
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PWC Article, There Goes the SunPainting & Wallcovering Contractor Vol 66. No. 1:
There Goes the Sun

Energy Saving Coatings May Spook Contractors with Their Complexity – But Interest Has Never Been Higher.

Although energy-saving coatings – those claiming to reduce the amount of energy a structure requires to stay cooler or warmer – aren’t new, they appear to have slipped under the radar of most painting contractors. One reason might be that these coatings are most typically applied to roofs (although wall applications are not uncommon) and as such, are generally used by roofers – yet even this industry at times has failed to take notice of these products…
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JLC - Cool Roofs for Hot ClimatesJournal of Light Construction:
Cool Roofs for Hot Climates

Even in hot, sunny climates, it’s common to see dark shingle roofs. That heat-absorbing choice carries a significant energy penalty: In sunny climates, heat gain through the roof makes up a major share of a house’s cooling load.

People try different strategies to limit heat gain through the roof. Extra ceiling insulation, extra ventilation, under-roof radiant barriers, and sealed attics with insulated roof decks can all help in certain circumstances…
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kitt peak thumbnailWestern Roofing:
An Astronomical Facelift – Desert Observatory Gets Renovated in Tucson, Arizona

Kitt Peak National Observatory is an astronomical site located in the Sonoran Desert just outside of Tucson, Arizona. Nestled atop a nearly 7,000 foot peak sits an array of over 25 optical and radio telescope. First founded in 1958, Kitt Peak continues to be at the center of modern astronomical research with observations on this sited noted for important contributions towards understanding dark matter, galaxy redshifts, supernovae near-earth asteroids and more.
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Studies

astm IRCC specification thumbnailASTM Designation C1321:
Standard Practice for Installation and Use of Interior Radiation Control Coating Systems (IRCCS) in Building Construction

1. Scope

1.1 This practice has been prepared for use by the designer, specifier, and applicator of IRCCS (Interior Radiation Control Coating Systems) for use in building construction. The scope is limited to recommendations related to the sue and installation of IRCCS, including a surface(s) normally have a far-infrared emittance of 0.25 or less that is sprayed or painted. Some examples that this practice is intended to address include…
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RIMA Interior Radiation Control Coatings StudyRIMA-International:
Evaluation of Coatings for Use as Interior Radiation Control Coatings

Especially formulated coatings and paints are used in building applications to conserve energy. A large number of products called “radiation control coatings (RCC)” are used on exterior surfaces to reduce the amount of solar energy absorbed by the surface and transported to the interior. A second class of products called “Interior Radiation Control Coating Systems (IRCCS)” are available for use on interior surfaces to reduce heat transfer from the adjacent interior air to the coated surface. Consensus standards for both product types have been developed by the American Society for Testing and Materials (ASTM). This evaluation was undertaken to determine the suitability of specific paints and coatings for us as IRCCS…
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nasa goddard coatings studyNASA-Goddard Space Flight Center – Thermal Control Coatings Laboratory:
Results from the UV Exposure study of 14 Thermal Control Coatings

Background: The GSFC Multisedes Vacuum System is used for Ultraviolet (UV) exposure and degradation studies. The system consists of two sorption pumps, a sputter-ion pump, and a sample chamber. The sample chamber consists of 16 sample positions. The system has the capability of testing a maximum of 14 samples at one time. the remaining sample positions contain a reference mirror and a blank. The sample holders are designed for a sample size of one inch in diameter and one-eighth of an inch thickness. Sample thicknesses may vary, but are limited by the multisedes sample holder design. Before beginning the UV exposure study, the samples’ reflectances are measured in the Beckman DK-2A Spectrophotometer…
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RIMA technical bulletin #112, A Review of IRCC Research, Radiant barrier paintRIMA-International Technical Bulletin 112:
A Review of Interior Radiation Control Coatings Research

An Interior Radiation Control Coating (IRCC) is a low-emittance paint or coating applied to building materials to reduce the thermal transmission across the space. Emittance or emissivity refers to the percent of radiant heat that a hot object emits or radiates. Building materials like wood and masonry typically have a very high thermal emittance and can have upwards of 80% radiant heat
transmission. Due to the low-emissive properties of the coating, a building product’s thermal emissivity can be reduced down to 25% or less.

While similar in function, an IRCC is notably different from a sheet radiant barrier. A sheet radiant barrier is a separate building component with a low emissive surface (0.10 or less) added to the building assembly, while an IRCC is a coating applied to an existing building component to lower that component’s emissivity. To qualify (under the ASTM definition) as an IRCC, the coating must be able to reduce the emissivity to 0.25 or less…
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McDowellOwens ThumbMcDowell Owens Integrated Forensic Engineering:
LO/MIT Conductivity and Ignition Testing Results

As you know, in recent years McDowell Owens Engineering, Inc. has been involved in the investigation of structure fires that involve reflective radiant barrier products that have been energized by electrical current. We have investigated dozens of these fires and have encountered approximately a half dozen different types of the radiant barrier products. The product most often involved has been OSB sheathing with aluminum foil laminated to the underside; however, we have also encountered several different types of what we call “rolled” products that are installed after construction. In our lab we have tested each of these products and found that when energized by electrical current, they readily ignite and are often found to be the “cause” of structure fires.

While we have never investigated a structure fire where a “paint on” radiant barrier product was involved, we were anxious to conduct testing on these products to understand the potential of ignition when energized electrically. SOLEC has been extremely cooperative and has provided us with several samples of your reflective radiant barrier products designed for use in structures. We have performed testing to these samples similar to that performed on all of the other radiant barrier products tested…
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Brochures

LO/MIT-I Technical Brochure, radiant barrier coating, radiant barrier paintLO/MIT-I Radiant Barrier Coating Technical Brochure

For all exterior and high temperature applications that require quick setup time. High reflectivity & low emissivity roof coating for energy conservation and heat & light reflection.


lomit 1 roof brochure thumbnailLO/MIT-I Radiant Barrier Coating Sales Brochure

For all exterior and high temperature applications that require quick setup time. High reflectivity & low emissivity roof coating for energy conservation and heat & light reflection.


LOMIT-II & MAX technical brochure thumbnailLO/MIT-II and LO/MIT-II MAX (IRCCS) Technical Brochure

Stop your home from being a solar heat trap this summer. For all interior applications. Use MAX for high temp and lower emissivity applications. Use LO/MIT-II for quicker setup time.


LO/MIT-II & II MAX sales brochure thumbnailLO/MIT-II and LO/MIT-II MAX (IRCCS) Sales Brochure

Stop your home from being a solar heat trap this summer. For all interior applications. Use MAX for high temp and lower emissivity applications. Use LO/MIT-II for quicker setup time.


LO/MIT-II vs II MAX comparisonLO/MIT-II vs. LO/MIT-II MAX Comparison Brochure

For all interior applications. Use MAX for high temp and lower emissivity applications. Use LO/MIT-II for quicker setup time.


Links

RIMA International
http://www.rimainternational.org/

ASTM
http://www.astm.org/

DOE – Energy Efficiency & Renewable Energy
http://energy.gov/eere/office-energy-efficiency-renewable-energy

DSIRE – State Incentives for Energy Efficiency
http://www.dsireusa.org/

Florida Solar Energy Center – Radiant Barrier Q&A
http://www.fsec.ucf.edu/en/publications/html/fsec-en-15/

AIA Continuing Education Program – Radiant Barriers & IRCCs
http://ronblank.com/courses/rim07a/rim07a.pdf