what is the proper fastening method for installing a metal roof?
Answers:
Most metal roofs I've seen (architectural, not corrugated tin) are 12" or wider sheets of painted metal, with pre-formed ridges that overlap and lock into the neighboring sheet. After 2 sheets are laid down and locked to each other, you install a special sheet metal screw with a rubber gasket just under the screw head. The screws are hex-head for solid driving, and are installed approx. every 12" into the ridge, running from the peak to the drip line.
Gable ends, drip edge strips and roof caps are also screwed in place.
Check with your metal roof manufacturer for complete installation instructions.
Other answers:
Depends on the manufacturer of the roof. Some have device that installs at joints where panels join, so they're hidden, others just use tek screws with washers that drill through panel and into framing member. The rubber washer is supposed to prevent water from leaking down the screw.
Depends on the manufacturer of the roof. Some have device that installs at joints where panels join, so they're hidden, others just use tek screws with washers that drill through panel and into framing member. The rubber washer is supposed to prevent water from leaking down the screw.
It's done with a combination of screws and washers, plus a gooey sealant along the overlapped edges. Different roofing variations require different specific fasteners. Contact your materials dealer or manufacturer.