Osb Sheathing Thickness For Roofs

The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24.

Osb sheathing thickness for roofs. Thicknesses range from 5 16 to 3 4 inch and the proper one. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Using osb osb comes in 4 by 8 foot sheets as does plywood but the manufacturing process allows the production of longer and wider ones. With edge support and the same snow load 3 8 inch osb can be used.

Sheets of 7 16 inch thick with no edge support can be used in an area where the snow load is 30 pounds per square foot. For pricing and availability. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. For heavier loads a 40 20 rated panel 19 32 or 5 8 will support a 130 psf live load and 48 24 rated panels 23 32 or are good to175 psf.

It will support roof. For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load. Osb roof decking thickness 7 16 1 2 or 5 8 currently we space rafters 16 oc and use 7 16 osb with h clips. Plywood s advantage over osb.

A homeowner recently wrote and asked me the following regarding osb roof decking. Keep in mind that the load of the roof still plays a role in the plywood thickness. Panel thickness will also affect permeability using the 2 perm variable of 7 16ths osb sheathing at 3 4 thickness the permeability drops to 2 3rds of a perm. Oriented strand board commonly referred to as osb is a type of engineered lumber similar to particle board formed by adding adhesives and then compressing layers of wood strands.

Thermostat 7 16 cat ps2 10 osb sheathing application as 4 x 8. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. When this is the case experts recommend a 5 8 inch thick sheet.

We re in dallas so we don t engineer for tremendous live loads for an asphalt shingle and we feel comfortable with 16 oc rafter spacing and 7 16 osb decking. That in a nutshell is the one big advantage plywood holds over osb. Osb sheathing 15 32 cat ps2 10 osb sheathing application as 4 x 8.