Increasing the Recycling of Manufactured Shingle Scrap in Minnesota: A Market Development Project

Status:  Complete
Report Date:  02/15/2007


This Mn/DOT Shingles Recycling Project was initiated to help accelerate the implementation of the use of manufacturers' shingle scrap into hot mix asphalt (HMA) in Minnesota. The intent was to help increase demand for manufacturers' recycled asphalt shingles in Minnesota through targeted outreach and technology transfer tools by addressing the information needs of private contractors and local agencies. Therefore, A Guide to the Use of Roofing Shingles in Road Construction was produced as part of a larger outreach and education campaign. Through interviews with HMA producers and other private companies, it was concluded that there was already very good acceptance of shingle recycling technology and that lack of adequate demand was not the key barrier to further market development. Rather, the lack of readily available supply of manufacturers' shingle scrap was determined to be the key barrier to further growth in recycling of this material. Most of the manufacturers' shingle scrap was already committed to a few recyclers and therefore did not allow new business entries into the marketplace. Recommendations for continued Mn/DOT market development support activities include additional research and specification development. The future promise of recycling "tear-off" shingle scrap may help address the limited supply of manufacturers' scrap.

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