Splice – Roof runs polycarbonate over 24 feet. On rafter style framing simply butt Base Extrusions on a common continuous roof rafter. Purlin style framing requires that a splice location should be of sufficient width to support the Base Extrusion.
Screws with Base & Cap Screws used in body of sheet and perimeter Silicone at joint of 2 Caps
See 8 – 25mm Polycarb some are 20 Yr Warranty – Lexan Thermoclear is clearly the industry leader