CoolRoofs

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Database of cool roofs materials

The database of cool roofs materials that is downloadable from the Cool Roofs project and the ECRC’s website is the output of the IEE supported project called Cool Roofs. As the Cool Roofs project is now finished, the management of the database has been transferred to the ECRC. It has been decided that it will undergo a major update in terms of content, measurement procedures, submission procedures etc. Until this process is finished we can not accept new products in the database. A full database management proposal will soon be available to the ECRC Technical Committee for consultation.

This folder contains the cool roof materials' database, accompanied by a detailed report describing procedures and methods to include products into the Cool Roof Project database. The folder also contains two reports referring to the description of the main roofing systems and products and to the product pricing and labeling.

Submit a product in the IEE cool roof database
(ECRC website)
Enter your lab in the IEE cool roof labs database
(ECRC website)

The database includes more than 200 products from Belgium, France, Germany, Greece, Italy, Spain, Sweden, United Kingdom and USA. The database is structured in a way to include all the relevant data related to the cool roof material: the product and manufacturer general data, the construction technology and the relevant thermo-physical properties (solar reflectance and infrared emittance) with the related performance indicators (maximum temperature surface and solar reflectance index). A standard format was developed containing all the information the manufacturer has to declare for each product to be included in the database.

The thermo-physical data are declared by the manufacturers after being be measured and calculated by an independent laboratory.

Since no specific cool roof standards exist in the CEN framework, the testing and calculation procedures for the product characterization are derived from international cool roof standards and EU standards implemented for other products but suitable for cool roof applications. In particular, it is required that the spectral reflectance measurements (300-2500nm) must be carried out according to:

  • ASTM Standard E903-96 - Standard Test Method for Solar Absorptance, Reflectance and Transmittance of materials using integrating spheres, or
  • EN 14500 (2008) Blinds and shutters – Thermal and Visual Comfort – Test and Calculation Methods

The solar reflectance is obtained as integration of the spectral reflectance values using the standard solar spectral irradiance as weighting curves. The irradiance standard data, to be used for the calculation of integrated values starting from raw spectral measurements, are tabled in the following standards:

  • International Standard ISO 9050:1990 - Glass in Building: Determination of Light Transmittance, Solar Direct Transmittance, Energy Transmittance and Ultra-violet Transmittance, and Related Glazing Factors, or
  • ASTM Standard G159-91 Standard Tables for References Solar Spectral Irradiance at Air Mass 1.5: Direct Normal and Hemispherical for a 37° Tilted Surface, or
  • EN 410 Glass in Building – Determination of luminous and solar characteristics of glazing, 1998.

 The broad band emittance measurements must be carried out according to:

  • ASTM E408-71(2002) Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques, or
  • ASTM ASTM C 1371 - Standard Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers, or
  • Annex D of prEN 16012 (2010) Thermal insulation for buildings - Reflective insulation products - Determination of the declared thermal performance

Spectral emittance measurements can also be performed using infrared spectrometers equipped with integrating spheres. The spectral emittance is obtained as the complement to 1 of the infrared spectral reflectance. Measurements must be in accordance with procedures defined in standards dealing with integrating spheres testing. Broad band values are obtained by integration of spectral data and weighted with the black body radiation curve at the laboratory air temperature recorded during the measurements.

The calculation of the solar reflectance index and the maximum surface temperature is performed in accordance with:

  • ASTM E1980 - 11 Standard Practice for Calculating Solar Reflectance Index of Horizontal and Low-Sloped Opaque Surfaces.

The cool roof characterization is carried out by independent laboratories equipped with experimental facilities complying with the above standards and able to perform the necessary calculation procedures to determine the broad band values starting from raw spectral data. The database includes relevant European laboratories.

Interested manufactures and laboratories are invited to download the Cool Roofs Material DATABASE report, which provides further details about the product and the laboratory database procedures and specifications.

According to the Cool Roof Project Annex, the management of the database will be incorporated by the European Cool Roof Council; the Technical Committee will be in particular responsible for this task. The next version of the product and laboratory database will be issued by the ECRC, as a consequence, procedures, requirements and structure may change respect to the actual version.

Enter your lab in the IEE cool roof labs database