Introduction to Solar Reflectance Index (SRI)

Last Updated: May 13, 2026 — Added: CRRC (Cool Roof Rating Council), initial vs 3-year aged SRI distinction, specific LEED v4.1/ASHRAE 90.1/California Title 24 SRI thresholds, SRI values table for common materials, pavement SRI, EN 15976 European standard.

Solar Reflectance Index in the Context of Sustainable Building

The Solar Reflectance Index (SRI) is the standardized metric that defines how “cool” a surface is — specifically, its combined ability to reflect incoming solar radiation and emit absorbed heat as infrared energy. In an era of escalating urban temperatures, energy-intensive cooling loads, and mandatory green building certifications, SRI has moved from a specialized material science parameter to a mainstream specification requirement for roofing, pavements, and building facades.

SRI testing is now required or incentivized by a growing list of building codes, green certification programs, and utility rebate schemes: LEED (Leadership in Energy and Environmental Design) awards Heat Island Reduction credits based on SRI thresholds; ASHRAE 90.1 prescribes minimum SRI for roofing in certain climate zones; California’s Title 24 Building Energy Standards mandates cool roof compliance for new construction and re-roofing in many occupancy types; and hundreds of local jurisdictions have adopted cool pavement and cool roof ordinances. Understanding SRI testing — what it measures, which standards govern it, and how certifying bodies like the Cool Roof Rating Council use test data — is essential for anyone involved in specifying, manufacturing, or installing building materials.

ContractLaboratory.com connects architects, roofing manufacturers, construction materials companies, and building product developers with accredited construction and building materials testing laboratories for SRI testing and related thermal and optical material characterization. See also our guide to LEED-compliant testing and building materials appearance and performance testing.

What Is the Solar Reflectance Index (SRI)?

The Solar Reflectance Index integrates two distinct thermal properties of a surface into a single standardized number that expresses the surface’s relative “coolness” compared to defined reference surfaces:

  • Solar Reflectance (Albedo): The fraction of incoming solar energy reflected by a surface, expressed as a decimal between 0 and 1 (or as a percentage 0–100%). Solar energy spans the ultraviolet, visible, and near-infrared spectrum (approximately 300–2500 nm). A surface with solar reflectance of 0.80 reflects 80% of incident solar energy and absorbs only 20%. Measurement methods: ASTM C1549 (portable reflectometer), ASTM E903 (spectrophotometer with integrating sphere).
  • Thermal Emittance: The efficiency with which a material radiates absorbed energy as thermal infrared radiation (heat) back to the environment, relative to a perfect blackbody emitter. Expressed as a decimal 0–1. A surface with thermal emittance of 0.90 emits 90% of the thermal energy of an ideal blackbody at the same temperature. Measurement method: ASTM C1371 (portable emissometer), ASTM E408.

The SRI is calculated using ASTM E1980 — Standard Practice for Calculating the Solar Reflectance Index of Horizontal and Low-Sloped Opaque Surfaces. The calculation determines the equilibrium temperature of the test surface under standardized solar irradiance and air temperature conditions (850 W/m² solar irradiance, 7.2°C ambient temperature, and a defined convective coefficient for medium wind conditions), and normalizes this temperature against two reference surfaces:

  • Standard black reference surface: Solar reflectance = 0.05, thermal emittance = 0.90. This surface reaches an equilibrium temperature of approximately 60°C under standard conditions and is assigned SRI = 0.
  • Standard white reference surface: Solar reflectance = 0.80, thermal emittance = 0.90. This surface reaches an equilibrium temperature of approximately 17°C under standard conditions and is assigned SRI = 100.

SRI values below 0 are possible for materials darker than the standard black reference, and values above 100 are common for highly reflective cool roof membranes that reflect more solar energy than the standard white reference (e.g., white TPO membranes can achieve SRI of 104–115). The scale is not capped at 100 — it is a linear index relative to the two reference points.

Typical SRI Values for Common Building Materials

The following table provides indicative SRI ranges for common building and roofing materials. Note that actual SRI values vary with specific formulations, colors, coatings, and aging. Values should be verified against manufacturer CRRC-rated test data for compliance purposes.

MaterialTypical initial SRITypical aged SRINotes
White TPO membrane (roofing)104–11585–100High-performance cool roof; meets most LEED low-slope requirements
White EPDM membrane (roofing)~78~60–70Lower initial SRI than TPO; may not meet all LEED low-slope aged requirements
White reflective roof coating95–11565–95Wide variance based on coating technology; acrylic coatings most common
White-painted/white concrete~86~70–80Affected by surface texture, dirt accumulation, and carbonation
Standard gray concrete / Portland cement~35~28–35Does not meet most cool roof requirements without coating
Light gray/tan concrete paver~38–45~30–40Depends on cement color, aggregate color, and surface finish
Red brick (uncoated)~20–30~18–28Lower SRI due to red iron oxide pigment absorbing solar radiation
Natural gray slate~20–30~15–25Moderate solar absorption; dark slates approach SRI 6
Light metal roofing (bare aluminum / Galvalume)~60–80~50–70Depends on surface oxidation; low emittance material compensated by high reflectance
Dark asphalt shingle (standard)~6–12~5–10Low SRI is typical for standard asphalt shingles; cool-color pigment shingles are available with higher SRI
Standard built-up roofing (BUR) with gravel~5–10~4–8Dark surfaces with low reflectance and moderate emittance
Dark EPDM membrane (black)~6–10~5–8Low SRI; high-emittance but very low solar reflectance
Standard asphalt pavement~0–5~2–8Fresh asphalt can increase SRI slightly with weathering/oxidation (lightening)

Note: These values are indicative ranges based on published research and CRRC-rated product data. Always obtain actual CRRC-rated SRI values from product manufacturers for code compliance and green certification purposes. Aged values assume 3 years of outdoor weathering per CRRC protocols.

SRI Testing Standards: The ASTM Framework

SRI testing involves a defined set of ASTM standards, each covering a specific measurement or calculation step. Understanding how these standards relate to each other is essential when ordering SRI testing services or interpreting test reports.

Solar Reflectance Measurement

  • ASTM C1549 — Standard Test Method for Determination of Solar Reflectance Near Ambient Temperature Using a Portable Reflectometer: The most commonly used solar reflectance measurement method in commercial SRI testing. A portable solar spectrum reflectometer (Solar Spectrum Reflectometer, Model SSR-ER or similar) is used to measure solar reflectance directly on material samples. Can be used in both laboratory and field settings. CRRC-approved; accepted by LEED, ASHRAE, and most building codes. Results in a single solar reflectance value.
  • ASTM E903 — Standard Test Method for Solar Absorptance, Reflectance, and Transmittance of Materials Using Integrating Spheres: A higher-precision laboratory spectrophotometric method that measures solar reflectance across the full solar spectrum (300–2500 nm) using an integrating sphere to capture all reflected light directions (hemispherical reflectance). More accurate than ASTM C1549 for materials with directionally complex reflection characteristics, but requires specialized laboratory equipment and is not field-deployable.
  • ASTM E1918 — Standard Test Method for Measuring Solar Reflectance of Horizontal and Low-Sloped Surfaces in the Field: Used for in-place measurement of solar reflectance on installed surfaces — roofs, pavements, and other horizontal or near-horizontal surfaces. Accounts for real-world conditions, including dust, soiling, and weathering. Used to measure aged solar reflectance in the field.

Thermal Emittance Measurement

  • ASTM C1371 — Standard Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers: The standard commercial method for thermal emittance measurement using a portable emissometer (Devices & Services Co. AE1 or similar). The emissometer compares the infrared radiation from the test surface to two reference materials of known emittance. Used for both laboratory and field measurements. CRRC-approved and accepted by all major building codes.
  • ASTM E408 — Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques: An older thermopile-based method for thermal emittance; less commonly specified in current building material SRI testing. Sometimes used as a reference method.

SRI Calculation

  • ASTM E1980 — Standard Practice for Calculating the Solar Reflectance Index of Horizontal and Low-Sloped Opaque Surfaces: This is not a measurement standard — it is a calculation standard. ASTM E1980 specifies how to compute the SRI from measured solar reflectance and thermal emittance values using the equilibrium temperature method under standardized solar and atmospheric conditions. The calculation requires specifying a convective coefficient (low wind, medium wind, or high wind conditions) — CRRC uses medium wind conditions for its Rated Products Directory. ASTM E1980 is required for any SRI value to be used in LEED, ASHRAE, or code compliance contexts.

European Standards

  • EN 15976 — Flexible sheets for waterproofing. Determination of emissivity: The primary European standard for thermal emittance measurement of roofing and waterproofing materials. Used in the EU market for SRI assessment and BREEAM (Building Research Establishment Environmental Assessment Method — the UK/European green building certification) compliance.
  • EN ISO 13793 and related standards: European standards governing thermal performance of building components; complementary to SRI assessment in European building energy codes.

The Cool Roof Rating Council (CRRC): The Industry’s Authoritative Rating Body

The Cool Roof Rating Council (CRRC) is an independent, non-profit organization that administers the CRRC-1 Product Rating Program — the most widely recognized third-party program for rating and publishing roof product radiative properties. Understanding the CRRC is essential for anyone working with SRI in a compliance context because virtually every major building code, green certification program, and utility rebate that references SRI values requires or references CRRC-rated data.

How the CRRC Rating Program Works

Under the CRRC-1 Product Rating Program, manufacturers submit roof products for testing by a CRRC-approved independent test facility. The test facility measures solar reflectance (by ASTM C1549 or E903) and thermal emittance (by ASTM C1371) for new (initial) samples. For aged ratings, representative samples are weathered outdoors at a CRRC-approved exposure site for three years under natural sun, rain, wind, and soiling conditions, then re-tested. The CRRC computes initial and 3-year aged SRI values using ASTM E1980 at medium wind speed for each product. All results are published in the publicly accessible CRRC Rated Products Directory at coolroofs.org, which is the primary reference document for SRI compliance verification.

The CRRC Rated Products Directory lists: product name and manufacturer; initial solar reflectance and initial thermal emittance; 3-year aged solar reflectance and 3-year aged thermal emittance; initial SRI and 3-year aged SRI; and the ASTM test methods used for measurement. The Directory is searchable by product type (low-slope membranes, steep-slope shingles, coatings, metal roofing, tiles) and updated as new rated products and aged ratings are added.

Initial vs 3-Year Aged SRI: The Critical Distinction

The distinction between initial SRI (measured on new, clean product) and 3-year aged SRI (measured after three years of outdoor exposure) is one of the most important concepts in SRI testing — and one of the most commonly overlooked in practice.

All roof surfaces experience changes in radiative properties over time from: environmental soiling (dust, organic debris, biological growth including algae and lichen); photochemical degradation of pigments and polymers by UV radiation; thermal cycling and physical weathering; and oxidation. For most materials, these factors reduce solar reflectance over time — sometimes dramatically. A cool roof coating with initial solar reflectance of 0.85 might retain only 0.60 after three years of field exposure. The aged SRI is what determines the product’s real-world energy performance over its service life.

Regulatory implications:

  • CRRC and ENERGY STAR: Both require both initial and 3-year aged ratings for product certification.
  • LEED v4.1: The Heat Island Reduction credit uses CRRC-rated values and specifically references aged values where available.
  • ASHRAE 90.1 and IECC: Recommend aged values but do not mandate them — initial values may be used if aged values are not yet available.
  • California Title 24: Specifies minimum solar reflectance and thermal emittance values that must be met using CRRC-rated product data.

Regulatory and Green Building SRI Requirements

LEED v4.1 — Heat Island Reduction Credit

LEED’s Heat Island Reduction credit (under Sustainable Sites) awards points for using high-SRI and/or vegetated surfaces for roofs and nonroof hardscapes. Under LEED v4.1 for Building Design and Construction:

  • Low-slope roofs (slope ≤ 2:12): Initial SRI ≥ 82 OR 3-year aged SRI ≥ 64.
  • Steep-slope roofs (slope > 2:12): Initial SRI ≥ 39 OR 3-year aged SRI ≥ 32.
  • Nonroof hardscapes (parking lots, walkways, plazas): 3-year aged SRI ≥ 33.

Product SRI values for LEED compliance must be from CRRC-rated products (listed in the CRRC Rated Products Directory) or tested using the prescribed ASTM standards. LEED requires documentation of both the testing standard used and the CRRC product rating certificate or laboratory test report.

ASHRAE 90.1 — Energy Standard for Buildings

ASHRAE 90.1 (Energy Standard for Buildings Except Low-Rise Residential Buildings) includes prescriptive cool roof requirements in its Envelope chapter. Under the current ASHRAE 90.1 editions:

  • Low-slope roofs (slope < 2:12) in Climate Zones 1, 2, and 3: Option A — 3-year aged solar reflectance ≥ 0.55 AND 3-year aged thermal emittance ≥ 0.75. OR Option B — minimum SRI ≥ 75.
  • Steep-slope roofs (slope ≥ 2:12) in Climate Zones 1, 2, and 3: Minimum SRI ≥ 29.

Climate Zone classification follows ASHRAE 169 — zones 1 (very hot) through 8 (subarctic). Cool roof requirements apply to the hottest zones (1–3) where cooling loads are dominant; colder zones may not require cool roofs and may prefer low-SRI materials that capture solar heat in winter.

California Title 24 — Building Energy Standards

California’s Title 24 Part 6 Building Energy Standards include mandatory cool roof requirements for new construction and re-roofing projects. California requires CRRC-rated products for compliance. Key requirements (values vary by climate zone and occupancy type):

  • Low-slope nonresidential roofs (most California climate zones): Typically require aged solar reflectance ≥ 0.63 or ≥ 0.55 (CZ1A) and aged thermal emittance ≥ 0.75, or meet equivalent SRI values.
  • Steep-slope roofing: Initial solar reflectance ≥ 0.20 or initial SRI ≥ 16 for most residential steep-slope applications in Title 24 climate zones.

California also has specific cool roof requirements for low-income housing programs (LIHTC) and certain public buildings. The California Energy Commission (CEC) maintains an approved product list based on CRRC ratings.

Applications of SRI Testing

Roofing Materials

SRI testing for roofing materials is the most commercially significant application. Manufacturers of single-ply membranes (TPO, EPDM, PVC), built-up roofing systems, modified bitumen, metal roofing, concrete and clay tiles, asphalt shingles, and roof coatings all require SRI testing to access CRRC ratings, LEED documentation, energy code compliance, and utility rebate programs. Products must be submitted to the CRRC-1 Program and achieve initial and aged ratings for commercial viability in the growing green building market.

Cool-color pigment technology — using near-infrared reflective (NIR) pigments that make dark-colored surfaces reflect solar energy in the invisible near-IR spectrum — has expanded the SRI range possible for dark-colored roofing products. A dark brown or forest green metal roof with cool-color pigments can achieve significantly higher SRI than the same color made with conventional pigments.

Pavements and Hardscapes

SRI testing for pavements addresses the urban heat island contribution from roads, parking lots, sidewalks, and plazas. Standard asphalt pavement has an SRI near zero and can reach surface temperatures of 60–70°C on hot summer days, dramatically elevating ambient air temperatures. Cool pavement strategies include: light-colored concrete (SRI ~35); concrete paving with white cement or light aggregate (SRI ~40–60); reflective surface coatings for asphalt (SRI ~30–60); permeable pavement (which also evaporatively cools through moisture). Cities including Los Angeles, Phoenix, and New York have implemented cool pavement programs for municipal streets and parking lots.

Field solar reflectance measurement (ASTM E1918) is used to characterize in-place pavements, since laboratory measurements on small samples may not represent large-format installed surfaces. LEED site credits for non-roof hardscape require a 3-year aged SRI ≥ 33 for at least 50% of the hardscape area (including both paved surfaces and at least 75% shade cover option).

Building Facades and Walls

Building facades and exterior walls also undergo SRI testing for energy code compliance and green building certification, particularly in hot climates where solar heat gain through vertical surfaces contributes to cooling loads. Facade materials tested include: exterior wall coatings and paints; brick and masonry cladding; aluminum composite panels (ACM); glass curtain wall systems (where solar reflectance is measured in conjunction with solar heat gain coefficient, SHGC). The energy performance of facades is typically governed by a combination of SRI (for opaque components) and SHGC/U-value (for glazing).

Challenges in SRI Testing and Interpretation

  • Surface texture and measurement geometry: Rough, textured, or directionally reflective surfaces may yield different solar reflectance values depending on the measurement instrument, geometry, and light source direction. ASTM C1549 (portable reflectometer) and ASTM E903 (spectrophotometer with integrating sphere) can give different results for the same textured surface. Test reports should specify which method was used.
  • Color vs SRI relationship — the cool-color technology gap: Dark colors are generally associated with low SRI, but cool-color pigment technology decouples color from solar reflectance by reflecting near-IR radiation invisibly. A specifier cannot assume that a dark-colored product has low SRI — always request CRRC-rated test data.
  • Aged value availability: For new or reformulated products, 3-year aged values are not yet available (marked “pending” in the CRRC directory). Specifiers must use initial values only for such products, recognizing that actual aged performance is unknown. Products with long CRRC rating history provide more reliable aged data.
  • Climate zone mismatch for SRI optimization: High SRI surfaces are optimal in cooling-dominated climates (Climate Zones 1–3) but may be counterproductive in heating-dominated climates (Zones 5–8) where solar heat gain in winter is beneficial. Building energy modeling should consider annual net energy impact rather than applying universal high-SRI requirements.
  • Vertical surface measurement: ASTM E1980 specifies horizontal and low-sloped surfaces. Vertical walls and facades require adapted approaches. The solar reflectance component can be measured with ASTM C1549 or E903 on coupons, but the ASTM E1980 SRI formula is calibrated for horizontal surfaces.

Urban Heat Island Effect: Quantifying the SRI Impact

Urban heat islands (UHIs) arise from the replacement of vegetated natural surfaces with impervious, heat-absorbing built materials. Measurements across hundreds of cities show that urban areas are typically 1–7°C (2–12°F) warmer than surrounding rural areas, with peak temperature differences occurring at night as heat-absorbing urban materials slowly release stored solar energy. The UHI effect increases cooling energy demand, exacerbates air pollution (urban heat drives photochemical smog formation), and increases heat-related illness and mortality.

Lawrence Berkeley National Laboratory’s (LBNL) Heat Island Group has quantified the energy impact of cool roofs and pavements: replacing a conventional low-slope roof (SRI ~6) with a cool white membrane (SRI ~100) can reduce building cooling energy consumption by 10–30% in hot climates, depending on building type and insulation levels. Nationwide deployment of cool roofs on all commercial buildings in the US has been estimated to offset approximately 1.6 billion tons of CO₂ equivalent over their service life — comparable to the annual emissions of 300 million cars.

Finding a Testing Laboratory for SRI

SRI testing requires laboratories equipped with specific instruments: a solar spectrum reflectometer (ASTM C1549) or UV-VIS-NIR spectrophotometer with integrating sphere (ASTM E903); a portable emissometer (ASTM C1371); and the software or capability to apply the ASTM E1980 calculation. For the CRRC Product Rating Program certification, laboratories must be approved by the CRRC. For LEED or energy code documentation, any ISO/IEC 17025-accredited laboratory using the specified ASTM methods may provide compliant test reports — CRRC ratings are an additional certification option beyond basic laboratory testing.

ContractLaboratory.com connects manufacturers, architects, specifiers, and building product developers with accredited construction and building materials testing laboratories for SRI testing, LEED documentation, and related thermal and optical material characterization. See also our LEED-compliant testing services and appearance and optical testing resources.

Frequently Asked Questions About Solar Reflectance Index (SRI) Testing

What is a good SRI value for a roof?

What constitutes a ‘good’ SRI value depends on the application, climate, and applicable code or certification requirements. For low-slope roofs (slope ≤ 2:12) seeking LEED v4.1 Heat Island Reduction credit, an initial SRI ≥ 82 or a 3-year aged SRI ≥ 64 is required. For ASHRAE 90.1 compliance in hot climate zones (1–3), a minimum SRI ≥ 75 for low-slope roofs is required. For steep-slope roofing (slope > 2:12), LEED requires initial SRI ≥ 39 or an aged SRI ≥ 32. White TPO membranes typically achieve initial SRI values of 104–115, making them well-suited for cool roof applications. In contrast, standard dark asphalt shingles achieve SRI values of 6–12, which do not meet cool roof requirements. In heating-dominated climates (ASHRAE Climate Zones 5–8), high SRI roofs may actually increase heating energy demand in winter, and minimum SRI requirements may not apply or may be counterproductive.

What is the difference between solar reflectance and the Solar Reflectance Index?

Solar reflectance (also called albedo) and the Solar Reflectance Index (SRI) are related but distinct metrics. Solar reflectance is a single physical property: the fraction of total incoming solar energy reflected by a surface, expressed as a number between 0 and 1 (e.g., 0.80 = 80% reflected). It is measured directly by laboratory instruments (ASTM C1549 reflectometer or ASTM E903 spectrophotometer). Thermal emittance is a separate property: the efficiency with which a surface radiates absorbed heat back to the environment, also between 0 and 1. The Solar Reflectance Index is a calculated composite metric — it combines both solar reflectance and thermal emittance through the ASTM E1980 calculation method to produce a single number representing how cool a surface remains in sunlight relative to standard black (SRI = 0) and white (SRI = 100) reference surfaces. SRI provides a more comprehensive picture of a surface’s thermal performance than solar reflectance alone — a surface with high solar reflectance but low thermal emittance (like bare aluminum) retains more heat than a surface with equivalent or even lower solar reflectance but high emittance.

What is the CRRC, and how does it relate to SRI testing?

The Cool Roof Rating Council (CRRC) is an independent non-profit organization that administers the CRRC-1 Product Rating Program — the recognized third-party testing and rating system for roof surface radiative properties. When manufacturers want to certify their roofing products as cool roof compliant, they submit products to the CRRC program, which arranges testing by CRRC-approved independent laboratories. The laboratories measure initial solar reflectance and thermal emittance, and after 3 years of outdoor weathering, measure aged solar reflectance and thermal emittance. The CRRC calculates both initial and 3-year aged SRI values using ASTM E1980 and publishes all results in the CRRC Rated Products Directory at coolroofs.org. The Rated Products Directory is the authoritative reference used for LEED Heat Island Reduction credits, ASHRAE 90.1, and California Title 24 compliance verification, ENERGY STAR documentation, and utility rebate programs. Without CRRC-rated values, demonstrating compliance with most major green building programs requires independently commissioning full ASTM testing and SRI calculation — the CRRC directory simplifies and standardizes this documentation.

What is the difference between initial and aged SRI?

Initial SRI is measured on a new, clean product sample before any weathering. It represents the best-case performance of the product immediately after installation. Aged SRI (or 3-year aged SRI) is measured after representative samples have been exposed outdoors for 3 years at a CRRC-approved exposure site, subjected to real sun, rain, wind, soiling, and biological colonization. All roofing surfaces experience some reduction in solar reflectance over time — the magnitude depends on the material type, surface texture, and local environment. Cool roof coatings may retain 90% of their initial reflectance with anti-soiling formulations, or may drop to 70-80% of initial reflectance with standard formulations. CRRC and ENERGY STAR require both initial and aged ratings. LEED v4.1 specifically recommends using aged values where available. Aged SRI is more relevant to real-world energy performance calculations and lifecycle cost analysis than initial SRI. When evaluating competing cool roof products, comparing aged SRI values provides a much more reliable performance benchmark than comparing initial SRI values alone.

Which ASTM standards are used for SRI testing?

SRI testing uses a set of coordinated ASTM standards with distinct roles: ASTM C1549 measures solar reflectance using a portable solar spectrum reflectometer — the most commonly used method in commercial SRI testing, approved by CRRC, LEED, and building codes. ASTM E903 measures solar reflectance by spectrophotometry with an integrating sphere, providing higher precision for complex surfaces. ASTM E1918 measures solar reflectance in the field on installed horizontal and low-sloped surfaces. ASTM C1371 measures thermal emittance using a portable emissometer — the standard commercial method for emittance. ASTM E408 measures total normal emittance using thermopile-based techniques. ASTM E1980 is not a measurement standard but a calculation standard — it specifies the formula for computing SRI from measured solar reflectance and thermal emittance values, using the equilibrium temperature method under standardized conditions. A complete SRI determination requires measurement per ASTM C1549 (or E903) and ASTM C1371, followed by SRI calculation per ASTM E1980.

Conclusion

Solar Reflectance Index testing has become a fundamental element of sustainable building material specification, green building certification, and energy code compliance. Understanding the full SRI framework — the ASTM testing standards (C1549, E903, C1371, E1980), the CRRC rating program, the critical distinction between initial and 3-year aged SRI, and the specific thresholds required by LEED v4.1, ASHRAE 90.1, and California Title 24 — equips architects, specifiers, and manufacturers to navigate this increasingly important requirement with confidence. High-SRI materials are not just a green certification box to check: in hot climates, they meaningfully reduce building cooling loads, extend roofing material service life through reduced thermal stress, and contribute measurably to urban heat island mitigation. ContractLaboratory.com connects architects, roofing manufacturers, and building product companies with accredited construction and building materials testing laboratories for SRI testing to ASTM E1980, C1549, C1371, and E903 standards. Submit a testing request or contact our team. can assist with your Solar Reflectance Index testing requirements or Submit a Testing Request to find the best lab for your project.

Author

  • Trevor Henderson, PhD, is a veteran Content Innovation Director and scientific strategist at LabX Media Group. With a career spanning three decades, Trevor is a recognized expert in scientific writing, creative content creation, and technical editing.

    His academic pedigree in human biology, physical anthropology, and community health provides him with a rigorous analytical framework, which he applies to developing industry-leading content for scientists and lab technicians. Since 2013, Trevor has led content innovation initiatives that drive engagement within the laboratory technology sector.

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