ASTM D6222/D6222M-16 PDF Download

The ASTM D6222/D6222M-16 standard is a specification that covers prefabricated modified bituminous sheet materials with polyester fabric reinforcement. These materials use atactic polypropylene (APP) as the primary modifier and are intended for use in the fabrication of multiple ply roofing and waterproofing membranes. The standard categorizes the modified bituminous sheet materials into Type I and II, with different surfacing options of granule (Grade G) or smooth (Grade S).

The specification outlines various physical properties that the sheet materials must conform to, such as peak load, elongation, tear strength, low temperature flexibility, dimensional stability, and more. It also sets requirements for the net mass and dimensions of the finished product, including width of the roll, area of the roll, selvage width, thickness, and bottom side coating thickness. The standard allows for the APP modified bituminous coating to be compounded with a mineral stabilizer and permits the reverse side and selvage to be covered with a fine mineral surfacing or other surfacing that does not interfere with adhesion or bonding.

It is important to note that this specification is focused on the material aspects of the modified bituminous sheet, and it does not address issues related to specific roof constructions or application techniques. In-place roof system design criteria, such as fire resistance, impact/puncture resistance, and material compatibility, are beyond the scope of this material specification. The standard also provides a note regarding the use of glass yarns in some modified bituminous sheets, which are not considered as significant contributors to the physical properties of the finished product.