May 4, 2010. Agency FOIA professionals typically find that working collaboratively and sharing experiences with fellow access professionals can be quite beneficial. To facilitate the exchange of ideas and information between agencies, OIP is convening two FOIA Working Groups. As agencies enter into their second year of work in improving the administration of the FOIA in accordance with the President's Memorandum on the FOIA and the Attorney General's FOIA Guidelines, this is an appropriate time for agencies to build on the successes of one another.
In a concerted effort to learn more. about the weathering characteristics. of TPO (thermoplastic polyolefin) sin -. gle ply roof membranes, WSRCA. began an in situ testing program dur -. ing the year 2000.
PVC and FPO membranes are heat welded at the seams giving superior protection against leaks as the two sheets are fused together which forms a complete and durable roofing membrane system. Single-ply membranes are given UV stabilisers allowing for long term use in exposed roof applications.VC (polyvinyl chloride) and FPO (Flexible polyolefin) share many common characteristics, neither can claim an overall superiority over the other, however particular characteristics of each of these two polymers can be exploited by the specifier to enhance the specification of their single ply roofing system.