Clips and Fasteners
What is a concealed clip and why does it matter?
A concealed clip anchors each standing seam panel to the roof deck without penetrating the panel surface. The clip is fastened to the substrate, and the panel seam locks over the clip during installation. This eliminates every roof penetration that an exposed fastener system would create.
How do floating clips manage thermal expansion on residential roofs?
Floating clips allow the panel to slide along its length as temperature changes cause expansion and contraction. A typical residential panel run of 20 to 30 feet expands approximately 0.2 inches over a 100-degree temperature swing. Without floating clips, the panel buckles and the seam integrity fails.
What fastener type is used to attach clips to the roof deck?
Pancake-head screws with EPDM rubber washers are driven through the clip base into the roof deck. The screw head profile must be low enough to sit beneath the panel seam without interfering with the seam lock engagement.
Does clip spacing affect wind uplift performance?
Yes. Tighter clip spacing increases the assembly's resistance to negative wind pressure. The manufacturer's engineering tables specify clip spacing for each wind zone. Perimeter and corner zones require closer spacing than field zones because uplift forces concentrate at roof edges. See high wind systems for enhanced specifications.