If you say that using exposed fasteners could have the possibility to have water come in, how can people use exposed fastener panels on the roof? i have seen guys go right over tar paper covered osb with no cleats.
just because people do it doesn't mean it's right. Many of the raised rib panel don't recommend installing over OSB or plywood, they recommend purlins. ***No*** manufacture condones installing any metal directly over roofing felt. It either needs to be a synthetic underlayment or a layer of rosin paper over the roofing felt. Raised rib panels were originally sold as AG panels for agriculture pole barns. These buildings typically have no OSB or drywall and small leaks are immaterial to the equipment and animals that are inside. The exposed fasteners will leak over time, I have replaced all the roofs washers on my pole barn that was built in 2001 already. It's of *MY*opinion that houses should never have exposed fastner roofs and nice shops/garages should seriously consider another option. Hucksters sell the durability aspect but that is really standing seam/snaplock roofing with hidden fasteners.
I am going with metal for siding because the cost is much cheaper and is less time consuming to put up. we live in a sub division out in the country so the residential look doesnt matter so much.
