Metal Roofing Directly Over Plywood

I just haven t found any good evidence that it would be a bad idea to use a metal roof over an unvented attic.

Metal roofing directly over plywood.

I wonder if it is okay to fix the metal roof panels directly to the plywood roof deck with underlayment in between or do i need to attach the panels to 1 x4 lath. Can i install the metal roof over the ice shield or do i need the 1 x 4 battens every 2 feet as well it s a low slope roof thus the ice shield for extra protection. I have removed all the old shingles from the roof boards not plywood the roof is in great shape and have installed an ice shield over the roof. But it seems the condensation will affect the 2x4 strapping.

The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal. So i plan to do it. A benefit to doing it this way is that you can see if there is any rotten plywood that needs to be replaced before installing the new roof. If you ensure the plywood is in good condition and well protected before placing the metal roofing you can expect the average life expectancy of your metal on plywood roof to be 40 70 years.

Install waterproof felt over the plywood to add protection against moisture. I don t want the extra expense of the 1 x4 s if i. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building.

When using plywood nail it directly to the purlins and screw the metal roofing panels through the plywood into the purlins as instructed by the manufacturer. I was planning on putting plywood over the rafters and cross the rafters with a 2 x4 every 16 to secure the metal roof to. Energy efficient and available in a variety of colors that will add value to your home metal roofing is a wise choice for homeowners. 1 remove the shingles before installing the metal roof the first way to install a metal roof over shingles is by completely removing the old shingles before installing the new metal roof.

The only thing that may impact this life expectancy would be a significant weather event or improper installation.