Hot Applied Rubberized Asphalt Roofing

(1)  Hot applied rubberized asphalt roofing shall be installed in accordance with CAN/CGSB-37.51-M, “Application for Hot Applied Rubberized Asphalt for Roofing and Waterproofing”.

Article Ontario Regulation 332/12 Building Code,   O. Reg. 332/12: BUILDING CODE ( © Queen’s Printer for Ontario, 2021.

The reactivity of the sealing layer on hot-applied rubberized asphalt (HRA) is critical for achieving successful performance. Over time, an HRA membrane will develop a thin secondary sealant layer that acts as a protective barrier against water ingress. The amount of acrylic present in the sealant layer at any given time is called its initial thickness.There are three components to an acrylic latex modified bitumen (ALM-BR) composition: solids, glycols and certain additives. When it comes to reactivity, the most important component is the glycol content and these additives are used only to improve performance where other properties are not desirable