Panels are laid across the roof with a side lap of one or more corrugations and fastened through the face with screws carrying sealing washers. Underlayment goes down first, closures fill the profile at eave and ridge, and trim finishes the edges.
Get Metal Roof Cost Guide connects you with licensed local companies. We are not a roofing contractor and do not perform the work ourselves.
This is the whole craft of an exposed fastener roof, and it is where most failures start.
Overdriven screws crush the washer and dimple the panel, which pools water. Underdriven screws never seal. Both leak within a few seasons.
Lap direction and closures. Side laps should run away from the prevailing wind, and the profile gaps at eave and ridge need foam or metal closures or the roof takes wind driven rain, insects and birds.
Cutting matters too: use snips or a nibbler rather than an abrasive saw, which throws hot filings that rust in the coating. the full cost picture covers pricing and the complete metal roofing guide covers the wider system.
Usually the flat, so the washer seats against a level surface. Some systems specify the rib, so follow the manufacturer's instruction for the panel you have.
The washers perish long before the panel does, so periodic checking and replacement is a normal maintenance task on an exposed fastener roof.
On agricultural and outbuildings, commonly yes. On a house a solid deck with underlayment is the usual specification and it performs better.
Get Matched
Tell us about your roof and we will connect you with licensed companies working in your area. There is no obligation to hire anyone.
