S-5-S™ Clamp

The answer to this question varies with the load direction, the seam profile, the roof material and the clamp model.

These variables result with a wide range of holding capacities from ±300 lbs (235 kg) to ±4,000 lbs (1800 kg). This is why for critical applications it is important to correctly identify the roof panel, seam type, gauge, etc along with the recommended seam clamp for the specific roof. When used on some “applied cap” architectural type seam styles, S-5! may yield low load-to-failure results as compared with integrated seam profiles. Always check our load table to verify the correct allowable holding strength on your specific roof type.

Our standard test procedures are to test the mini (one setscrew) clamps with negative load normal to seam, and standard (two setscrew) clamps with load parallel to seam. We have performed numerous parallel to seam datum tests on mini clamps and concluded from engineering analysis the mini clamp is (conservatively) obtaining more than ½ the strength of the standard clamps. In fact, the majority of the datum testing indicates the strength of a mini is closer to 2/3 the strength of a standard clamp. In due course, we are adding certified lab testing in this load direction for mini clamps.

In the interim, should certification of the load application parallel to seam be critical to your application, we suggest using the standard (two setscrew) design. 

The metallic and architectural coatings used on many sheet metal panels are thin and fragile. There may be copycat snow guard products in the marketplace that also utilize setscrews for attachment.

The metallic and architectural coatings used on many sheet metal panels are thin and fragile. A common setscrew with a cup-point gouges through protective coatings, violating warranties and causing corrosion sites at the point of attachment. S-5! utilizes special, polished, round-tipped screws. Although more costly, the makers of S-5! use this method to preserve delicate panel finishes and their warranties. This is only one of the reasons that all major metal roof panel manufacturers approve and recommend S-5! Products. They know and trust S-5! to do it the right way!

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 2,000 hours in the salt chamber, no corrosion was detected at any of the setscrew locations! 

We also use the highest quality (18-8) stainless steel alloys for all S-5! hardware, and include auxiliary stainless mounting bolts to assure longevity and metallurgic compatibility—no matter what the attachment application.

S-5! clamps will not fit on face-fastened trapezoidal rib or corrugated type panels. While our clamps won't work on thru-fastened roofs, we do have bracket products for them. Explore our entire line of brackets.

S-5! products will not fit to hollow “batten” seam type panels (see images in red below) - but can be used for the traditional (wood-backed) batten seam folded joints, as shown below in green.

Any time there is a folded seam we can usually attach a clamp to it. A great way to know if we have a product for your roof is to determine what the roof is with our "Clamp-to-Seam tool".