Contact Us

Cool Roof Rating Council Rates ThermalBlock by Coat Zone®

Close-up of ThermalBlock product with spray gun

Written by

Coat Zone

in

, ,

We are pleased to announce that ThermalBlock by Coat Zone®, our high-performance radiant barrier coating for rooftop HVAC systems and exposed ductwork, is now rated by the Cool Roof Rating Council (CRRC). The Notification of Product Rating, issued June 10, 2026, confirms that independent, accredited laboratory testing of ThermalBlock by Coat Zone® meets the requirements of the ANSI/CRRC S100 Standard and the CRRC-1 Program Manual.

A CRRC rating is more than a badge. The rating is a third-party verification standard that is foundational to how reflective building products are evaluated, specified, and approved for use under modern energy codes. Here is what the certification covers, what the numbers mean, and why it matters for projects where solar heat load and energy performance are part of the design conversation.

What the Cool Roof Rating Council Does

The CRRC is a nonprofit organization that develops fair, accurate, and credible methods for evaluating and labeling the radiative properties of roofing and exterior wall products. Its mission is to bring objective, scientific information about cool surfaces into decisions affecting heat islands, extreme heat, and energy use in the built environment.

The CRRC requires products to be tested by CRRC-approved, ISO 17025-accredited laboratories. As an ISO 17065-accredited organization, the CRRC reviews test data and determines whether a product meets the ANSI/CRRC S100 Standard before issuing a Notification of Product Rating. CRRC publishes rated products in its Rated Roof Products Directory. Architects, code officials, and building owners can verify performance values directly in the publication.

This distinction matters in specification work. Building codes and green building programs increasingly reference CRRC ratings directly. California’s Title 24, Part 6 energy code sets minimum requirements for thermal emittance, three-year aged solar reflectance, and Solar Reflective Index for roofing materials. The Los Angeles Green Building Code similarly requires minimum three-year aged values for residential roofing. LEED’s heat island credit pathway also references reflective roofing performance. A CRRC rating gives specifiers a verified, code-recognized data point rather than an unsubstantiated manufacturer figure.

The Two Numbers That Matter For CRRC Rating

Every CRRC rating is built on two core measurements. Each measurement is scored on a scale from 0 to 1, where 1 represents 100% performance.

  • Solar reflectance measures how much of the sun’s energy a surface reflects rather than absorbs. A higher value means less solar heat is transferred into the substrate below.
  • Thermal emittance measures how efficiently a surface releases any heat it does absorb. A higher value means the surface sheds absorbed heat more quickly rather than retaining it.

The CRRC measures both properties at two points in a product’s life. The initial rating is taken on a new sample. The three-year-aged rating is taken after the product has been weathered to simulate real-world exposure. This second data point is critical because surface soiling and weathering can reduce reflective performance over time. A product that only reports strong initial numbers may not reflect how it will perform several years into service.

ThermalBlock by Coat Zone®‘s Rated Performance

According to the CRRC’s Notification of Product Rating, ThermalBlock by Coat Zone® (Bright White, smooth finish, Rated Product ID 1504-0001) achieved the following verified results:

  • Initial solar reflectance: 0.89
  • Three-year aged solar reflectance: 0.80
  • Initial thermal emittance: 0.87
  • Three-year-aged thermal emittance: 0.87 (unchanged after weathering)
  • Initial Solar Reflective Index (SRI): 112
  • Three-year aged SRI: 100

The product is rated for both low-slope and steep-slope applications. This reflects the range of rooftop HVAC configurations and ductwork installations where ThermalBlock by Coat Zone® is typically applied.

These figures align with and reinforce testing that ThermalBlock by Coat Zone® has already undergone through other independent protocols. The protocols include ASTM C1549 reflectivity testing, ASTM C1371 emissivity testing, and an NFRC 201-2017 solar heat gain coefficient test conducted by Intertek Solar Labs, which confirmed a 93% reduction in heat transfer through coated surfaces. The CRRC rating adds a recognized, code-referenced verification layer on top of that existing body of evidence. However, this verification is specifically built around the long-term, weathered performance that matters most over a building’s service life.

Why This Matters for Specification and Design Decisions

For architects and specifiers, a CRRC rating simplifies due diligence. Rather than evaluating a manufacturer’s internal test data on a case-by-case basis, ThermalBlock by Coat Zone®’s performance values are now independently verified, standardized, and listed in a public directory. Professionals use this format to evaluate any other reflective roofing or coating product under consideration for a project.

For building owners and facility managers, the practical implication is straightforward. ThermalBlock by Coat Zone® is a thermal radiant barrier coating with credentials that withstand the same scrutiny applied to cool roofing systems. When ThermalBlock by Coat Zone® is applied to rooftop HVAC cabinets, package units, and exposed ductwork, it blocks up to 93% of solar heat and reduces surface temperatures to within 10°F of ambient air, even under peak summer sun. The CRRC’s three-year aged data confirms that this performance holds up over time rather than fading after the first season of exposure. The thermal emittance rating, notably, showed no decline after three years of weathering.

That durability translates directly into the operational benefits building owners care about: reduced HVAC run time, lower energy consumption, and extended equipment lifespan, all stemming from a coating now backed by one of the most recognized verification bodies in the reflective materials industry.

A New Standard of Verification for ThermalBlock by Coat Zone®

Earning CRRC certification reflects Coat Zone®’s ongoing commitment to backing our performance claims with rigorous, independent verification. Energy codes and sustainability requirements continue to place greater emphasis on the long-term, real-world performance of building materials. Having ThermalBlock by Coat Zone® listed in the CRRC Rated Roof Products Directory gives architects, specifiers, and building owners a verified, code-recognized data point to support their decisions.

To view ThermalBlock by Coat Zone®‘s full CRRC rating or learn more about specifying it for your next project, contact us today.

Citation List

More posts