Metal Roof Directly On Rafters

How to install a metal roof over open rafters step 1.

Metal roof directly on rafters.

The products and technology used so successfully in metal web joists for floor construction can also be employed for metal web rafters in a trussed roof design. The decking of a roof is typically a plywood layer that is fastened directly onto the rafters. If you have an assistant have him hold it while you climb to the roof. I guess at 14x16 you won t be towing this one but the wind still blows and osb does not have adequate holding power to resist the wind trying to rip the metal roof sheeting off.

A potentially easier option is to use purlins on top of the rafters rather than framing between the rafters. Sheathing over the rafters is a structural component and when not used just a metal roof cross bracing may be necessary as the metal does not provide enough. While decking is not required for a metal roof and is often not used for shops barns or other outbuildings if a metal roof is being put onto a home or a garage the use of decking is common. A 70 mph wind can rip things apart very easily and in some locations the winds are much stronger.

Put on your safety equipment including gloves safety goggles and the roofer s harness. Metal roofing screws need to go into framing. That s common for metal roofing. Metal web rafters also known as steel roof trusses offer the specifier and contractor unique benefits compared to other methods of roof construction.

Brace the ladder securely. Being just a 12 patio cover may require less but you don t want that metal blowing away. It does create some additional work just at the edges to close between the purlins but that s much less than cutting cross.