National Coatings Blog

Acrylic Coating Systems Restore Single-Ply Roofs

Posted by Nicole Gale on Thu, Jul 07, 2022 @ 10:30 AM

Restore Singleply w acrylicSingle-Ply membranes are challenging for coatings to adhere to, especially TPO. Most roof coatings require caustic primers, acid etching agents, or high VOC solvents that need to be rinsed off and sometimes collected for disposal, adding additional cost to a roof life extension project. National Coatings fortunately has a quick and easy solution for Single-Ply --- the AcryShield A502 base coat.  A502 allows for direct and tenacious adhesion to Single-Ply membranes without the need for a primer or etching rinse.

A502 was introduced to the roofing industry over 16 years ago after it went through years of intensive research and successful installation - both laboratory and actual in-service field testing. This coating was designed with self-priming characteristics that eliminate the need for primers or etching rinses while exhibiting tenacious adhesion for thermoplastic and thermoset single-ply membranes, such as Hypalon, TPO and EPDM.  Previously, the only primers used for coating these membranes were solvent borne, which required warning labels, had very high VOC (volatile organic content) and required extreme care when applying to prevent fumes from entering the building.  The only other option for coating EPDM was a "prewash" or "rinse-able primer" that had a significant list of warnings associated with its use.

The AcryShield A502 has three inherent advantages over the previously used primers:

  • It is water borne, so there is no concern about flammable solvents, VOC or fumes entering buildings.

  • It replaces both specialty primers for the thermoplastic membranes and the corrosive rinseable primer for EPDM.  Thus there is no need for separate primer/basecoats for different types of roofing membranes.

  • Its VOC is only 0.5 grams per liter. (According to the International Green Construction Code (IGCC) the mandated maximum allowed is 50 VOC’s grams per liter.)

AcryShield A502 has allowed National Coatings to be the only acrylic roof coating manufacturer with industry leading capabilities that successfully adhere directly to aged and failing single-ply membranes with a proven and verifiable 16-year track record. The next time a project calls for coating single-ply membranes, request the AcryShield A502

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