How Thick Of Plywood For A Roof

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.

How thick of plywood for a roof. One of the most important factors when selecting the plywood for your roof is how thick each piece should be. The cabin is just 440 sf and is in zone 6. He said it s only a difference of 1 8 thickness. Like most other things there is no one right answer for the plywood thickness of your roof.

Standard roof sheathing which consists of 4 by 8 sheets of plywood or oriented strand board or osb is 1 2 inch thick and attaches directly to the roof rafters or the roof trusses. What thickness of plywood for shed roof. That s considered to be the minimum. The typical thickness range for sheathing is 3 8 to 3 4 inch.

Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Never attach roof sheathing with staples. The existing plywood on my roof is only 3 8. However 3 4 th inch plywood is also used for a roofing system that has a heavier load.

This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load. An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof. The work is in building it collecting the material etc so i take the view that the extra cost is small compared to the work effort. For the less standard 20 inch apart rafters plywood with inch or 5 8 th inch thickness can be used.

Can someone direct me to blogs or q a titles that address roof sheathing thickness. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. A local roofer submitted a proposal to me for a roof placement that included replacing rotten plywood with 1 2 cdx. Post by diy johnny tue feb 20 2018 7 27 pm not advice but i d opt for the 18 if it were my shed.

Roof will be fully vented. My cabin trusses will be 24 oc and i will use either 1 2 or 5 8 osb sheathing and a standing seam metal roof. Snowfall and ice accumulation can affect the load put on a roof. 8d ring shank nails should be used instead.

Sheathing should be a minimum of 19 32 inch thick. I thought perhaps he made a mistake but no this is what he is proposing.