Plywood Thickness For Metal Roofing

Steeper rather than flatter roofs will have lesser load per sq.

Plywood thickness for metal roofing.

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. I thought perhaps he made a mistake but no this is what he is proposing. It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal. May 26 2020.

Sheet with varying 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. Foot and with a maximum of spacing of 16 inches between rafters. Tips for installing metal roofing accessories.

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. A half inch thickness is considered to be standard in a lot of areas and it should work just fine considering that it s deemed okay by the roofing contractor after considering the things above. On top of this underlayment goes a slip which protects the material from tearing as the metal roof expands and contracts with changing weather. 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.

This plywood is strong and durable enough for use in roofing framing and other exterior structural projects. 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. Plywood with fewer plies is weaker than a plywood with more plies even if they have the same thickness. Selecting metal roofing trim.

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. A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1 2 cdx. Plywood typically comes in 4 8 ft. The minimum thickness of plywood used for roofing is 3 8 th of an inch.

He said it s only a difference of 1 8 thickness. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. Multi ply is a catchall term for plywood with seven or more plies. Nearly all homes have a layer of plywood or.