*T. Lane- My license in Florida specializes in solar contracting regarding roofing work in installing All Types of solar panels on roofs. A couple of notes on roof mounting hardware. Usually the strongest mounts are J bolts premanufactured or made at the site to wrap around the trusses. Spanners of trusses are more time consuming And must be nailed or screwed into the trusses as the roof will flex in various weather conditions loosening the spanner. The all thread rod through a roof must be real near a rafter or a spacer block must be used to prevent pulling the roof in as the mounting attachment rod pulls tight from above or below. Make sure you consult with local licensed roofers in your area. All roof top mounting hardware should not require a build up of the roof. The main brackets and roof mounting hardware sold by manufacturers or site built shown create at least a 1 1/2 " channel under the rack. Research in Florida shows that solar panels in hot weather conditions need to be over 3" off the roof not to suffer major voltage losses due to heat. Roof temperatures here in Florida and Carribean often goes up to 170 degrees farenheit. Beware of flat roofs, its best to use weight to hold solar panels on the roof instead of making penetrations. Usually you void the entire roof warrenty on a flat roof unless the roofer who put the roof on is subcontracted to make the penetrations into the roof, especially true on commercial roofs. Roofing work, in regards to mounting solar panels requires a solar contractor CVC state license. An electrical contractor is required to hire a state licensed roofer or a CVC solar contractor to mount solar panels on any roof. The CVC license and training is designed to qualify one contracting license to do all the work required in mounting solar electric panels, solar hot water, and solar pool heating. It's easy to get in Florida, if you've had any experience and are willing to learn about worker's comp and safety laws and how to conduct a legal business so that you prove to the bueraucracy that you know how to pay Caesar all the taxes required to operate a business.