Letters

SPRI supports revised standard

On behalf of the single-ply roofing industry, I am writing to comment on "Issues with TPO membranes" by Mark S. Graham, NRCA's associate executive director of technical services, August issue, page 24.

SPRI recognizes there are recent reports of and articles referring to differences in the performance of various TPO membranes evaluated under ASTM D6878, "Standard Specification for Thermoplastic Polyolefin Based Sheet Roofing." SPRI remains fully in support of increasing the standard's performance requirements so concerns about the viability of TPO membranes can be put to rest once and for all.

SPRI understands an ASTM International task group addressing this issue has work in progress, which is necessary to support a revised standard. To this end, SPRI supports ASTM International's commitment to strengthen the current standard based on sound research.