Testing Confirms EPS is Mold Resistant

The EPS Molders Association (EPSMA) sponsored a test program focusing on EPS and mold resistance. EPSMA contracted SGS U.S. Testing Company for test services on EPS using ASTM C1338 “Standard Method for Determining Fungi Resistance of Insulation Materials and Facings.” The objective of the test program was to provide conclusive evidence that EPS does not support the growth of mold and fungi.

Samples of Type I EPS as prescribed in ASTM C578 and CAN/ULC S701, representing the typical product for most building and construction applications, were submitted for testing.

The ASTM protocol subjected the EPS to the following fungi:

  • Aspergillus niger
  • Aspergillus versicolor
  • Penicillium funiculosum
  • Chaetomium globosum
  • Aspergillus flavus

The results show that in a laboratory under ideal growth conditions, the fungi did not grow on the expanded polystyrene samples.

Expanded polystyrene building products provide the performance benefits needed for a healthy home. In addition to mold resistance, its energy efficiency was tested during a three-month research study conducted by NAHB Research Center. Results concluded that homes constructed with ICFs outperformed wood frame homes saving the homeowner 20 percent in heating and cooling costs. In other studies, EPS roof insulation retained its original insulating value up to and beyond fifteen years of use thus EPS can be specified without adjusting the Rvalue for aging. EPS building insulation does not emit volatile organic compounds (VOCs) during or after installation creating a “clean” breathing environment.

Pentane is the blowing agent used in the manufacture of EPS, and does not contribute to the depletion of the stratospheric ozone layer. EPS manufacturers recapture up to 95% of the pentane released during the manufacturing process by installing state of the art emission abatement equipment.

A technical bulletin from the EPS Molders Association on mold resistant expanded polystyrene is attached.

The EPS Molders Association represents expanded polystyrene manufacturers throughout the US and Canada. For more information on EPS performance in building and construction applications, please contact the EPS Molders Association at 800-607-3772.

Contact: Deniz Carroll


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