Help! I am building a Dock on Lake Jessup here in Central Florida, all under permit and with plans. Plans call for decking and shingle over a Gazebo on the dock, but local inspectors will allow options on materials for roof. I wanted to reduce weight so I am opting for a metal roof. My first problem was to find a “product approval” for constructing a metal roof over an open frame with 2x4 purlins WITHOUT plywood decking. For the non FL residents out there, we have enacted an insane process for satisfying the Florida Building Code that requires preapproval for products used in construction. That’s a whole forum on it’s own, so quickly to the bottom line: I have found one supplier that has the approval for their panel, a pretty standard ribbed 29 gauge metal panel for roofing, and they give all the details of attaching the panel to 2x4 purlins but no information on required fastening of the purlins to the trusses, or 2x6 rafters in my case. So, I’m interested in any attachment details anyone may have seen in a similar situation that would satisfy or overkill wind loading. I guess a couple of 3" screws at each crossing would do the necessary, but I would like to hear any experiences or just quote from a spec somewhere. I am not in the High Velocity Wind Area and not subject to the Miami-Dade code.
Thanks for ANY help