Designing a special screw for our S-5!® product lineup was only the beginning. We then conducted ASTM B-117 salt spray weathering tests on panel seam specimens to determine whether these screws caused any damage, however slight, that could result in premature corrosion. After 1,000 hours in the salt chamber, no corrosion was detected at any of the setscrew locations! In fact, S-5!® offers the only setscrew-based attachment system on the market that puts neither your roof nor your roof warranties in jeopardy!