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The Science & Lab Testing That Show Why Roof Rejuvenation Is Better Than Roof Replacement

Test & Evaluation Report - Screening Evaluation of Shingle Rejuvenator - By PRI Asphalt Technologies, Inc


Rejuvenators have a long history of limited use in the asphalt roofing industry. Initial use was limited to conventional hot-mopped built-up roofs. Over the years, there have been attempts to restore/maintain rejuvenated asphalt shingle roofs.

In the most recent times, asphalt rejuvenation has gained national focus in the paving industry. In response to the enhanced focus, a number of new technologies have been introduced. Some of these products are advancing the rejuvenation/restoration technologies and are hypothesized to exhibit efficacy in the asphalt roofing industry.


Perform and assess selected screening evaluation to provide insight on the Greener Shingles roof treatment.


Based on a Spray Application Rate of 1 gal/125 ft.2, followed by a five (5) day 'cure' period on aged shingles provided.

  1. Flexibility, 23°C was improved (Failure to pass).
  2. Granular Adhesion was improved significantly from a granular loss of 1.11 g to a loss after treatment of 0.15 g, an 86% improvement.
  3. Hail Impact was slightly improved after treatment. The improvement, 6.6%, was minimized by the type of shingle evaluated - organic felt based. The data suggests hail impact would have a greater improvement on FG mat-based shingles.
  4. Fire Resistance 'UL Speed of Flame:' The treated shingles exhibited a flame spread of 86 in 2 vs. the untreated shingles exhibiting a 144 in2 spread. Greener Shingles rejuvenator proved 40% better flame resistance vs untreated shingles, this was unexpected.


These screening evaluations strongly suggest the Greener Shingles Roof Treatment provides benefits to key performance properties of asphalt shingles associated with durability and possible extended life cycles.

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