Plywood Floor Sheathing Thickness

The wider the space between your joists the thicker your material must be as thicker material has a higher span rating.

Plywood floor sheathing thickness.

Table r503 1 minimum thickness of lumber floor sheathing joist or beam spacing inches minimum net thickness perpendicular to joist diagonal to joist 24 11 16 3 4 16 5 8 5 8 48 a 1 1 2 t g. See doc ps 1 for plywood species groups. This type of plywood won t sag when used on a 12 inches joist structure. Plywood sheathing thickness jerry liebler posted in building code questions on june 6 2012 09 12am for a single floor residence is nominal 3 8 plywood acceptable sheathing on 10 foot tall walls built with 24 oc advanced framing.

Avoid using 1 2 inch plywood sheathing for a floor. Or for floor sheathing over supports spaced up to 16 inches o c. Glue is sprayed between each layer and the sheet is hot pressed. Cdx plywood should be a minimum of 7 16 inch thick.

7 16 15 32 and 1 2 inch thick panels require. Panel selection handling and storage table 2. The recommended shed floor plywood thickness is 3 4 inch pressure treated exterior grade cdx plywood. The thicknesses are as follows.

It is rot resistant with knots replaced with football. Floor panels conforming with this table shall be deemed to meet the design criteria of section 2304 7. The required span rating is affected by the spacing on your floor joists. Sheathing over supports spaced up to 32 inches o c.

Applicable to grade c c. Two sheets of 3 4 inch exterior grade plywood is the minimum accepted thickness for natural stone installations and if the stone is particularly heavy you may need to use floor joists that are 12 inches on center rather than the traditional 16. Usually these materials are either plywood or oriented strand board osb and are purchased in 4 by 8 foot sheets. Applicable to all grades of sanded exterior type plywood.