S-5-KHD™ Clamp

All S-5! clamps undergo rigorous mechanical tensile load testing. We typically test in two load directions: Negative load normal-to-seam testing (pulling-up), and parallel-to-seam testing (drag load). We actually developed these test protocols back in 1992 as ASTM has no prescribed test procedures for this type of testing. For more on our testing protocols and results, visit this link and check out our video.

The key to frequency and spacing of attachment points for PV is to distribute loads to the metal standing seam panels in a manner that is consistent with the intended distribution of loads from the roof panels into the building structure.

With very few exceptions, the attachment of a single S-5! clamp (even the “Mini”) to the seam will be stronger than a single point of attachment of the seam to the building structure. Hence the “weak link” is not the S-5! clamp, but the attachment clips that hold the metal panels to the building structure, or the beam strength of the roof panel seam, itself.

The most conservative approach to the spacing/frequency of PV attachment to the roof is to determine the spacing/frequency of the roof’s attachment to the building structure; then duplicate it at minimum. Read more about how to determine panel attachment spacing. 

Standing seam metal roofing (SSMR) is the most convenient of any roof type for mounting PV modules, either crystalline or thin-film. 

Standing seam metal roofing (SSMR) is the most convenient of any roof type for mounting PV modules, either crystalline or thin-film. The seams of SSMR are beam-like elements that not only add stiffness and flexural strength to the roof panels but also provide expedient attachment points for a PV system. Joining PV modules to this roof type can be done with or without continuous mounting rails using aluminum seam clamps.

Also, check out our project breakdown of a solar PV system using rails and using the direct-attach™ method: "5 Things to Consider When Wanting a Low-Cost Solar Module Mounting System". Read more about how you can install the most cost-effective solar PV system.

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".