Plywood Thickness For Metal Roofing

Nearly all homes have a layer of plywood or.

Plywood thickness for metal roofing.

Manufacturers express the thickness of metal panels as their gauge with 22 gauge being the thickest and 29 gauge the thinnest of traditionally sold metal roof and wall panels. The minimum thickness of plywood used for roofing is 3 8 th of an inch. Steeper rather than flatter roofs will have lesser load per sq. I thought perhaps he made a mistake but no this is what he is proposing.

Plywood typically comes in 4 8 ft. Tips for installing metal roofing accessories. On top of this underlayment goes a slip which protects the material from tearing as the metal roof expands and contracts with changing weather. Selecting metal roofing trim.

Sheet with varying thickness. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal. Foot and with a maximum of spacing of 16 inches between rafters.

He said it s only a difference of 1 8 thickness. If you are installing metal roofing onto plywood it is even more imperative that you have a solid base to place the metal roofing on. A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1 2 cdx. Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design.

The thickness of plywood used for roof decking depends on the roof slope the spacing of rafters and the weight of other material to be put over the decking as well as the design load the. May 26 2020. To secure it measure it roll it out over the plywood cut it to the dimensions of the roof with a roofing or utility knife and finally hammer it securely to the plywood with 1 2 inch roofing nails. Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes.

This kind of plywood can be used on roofs with minimal load. This plywood is strong and durable enough for use in roofing framing and other exterior structural projects. The existing plywood on my roof is only 3 8. 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.