STEELBUILDING.COM's standard wall sheeting is PBR panel. We also offer PBA architectural panel. The "A" profile partially conceals the fasteners, which are only visible to someone directly facing the wall, and it creates a very attractive shadow pattern (it is often called "shadow panel"). PBR and PBA panels are made from the same coil stock, have the same specifications and cost the same per sheet. However, the PBA profile usually adds a little to the price of a metal building because less of the panel contacts the girts, so we have to add extra bracing to compensate for the loss of diaphragm effect (for more information on diaphragm action, see the
framing section).