Plywood Floor Sheathing Thickness
Floor panels conforming with this table shall be deemed to meet the design criteria of section 2304 7.
Plywood floor sheathing thickness. The required span rating is affected by the spacing on your floor joists. This type of plywood won t sag when used on a 12 inches joist structure. The thicknesses are as follows. 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.
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. Panel selection handling and storage table 2. The recommended shed floor plywood thickness is 3 4 inch pressure treated exterior grade cdx plywood. Or for floor sheathing over supports spaced up to 16 inches o c.
Metric equivalents of panel dimensions note. Applicable to all grades of sanded exterior type plywood. Page 3 of 7 v1 0 01 2008 table b relationship between span rating and nominal thickness for plywood a nominal thickness b in span rating 3 8 7 16 15 32 1 2 19 32 5 8 23 32 3 4 7 8 1 1 1 8 sheathing span 24 0 0 375 0 437 0 469 0 500. Avoid using 1 2 inch plywood sheathing for a floor.
Usually these materials are either plywood or oriented strand board osb and are purchased in 4 by 8 foot sheets. Cdx plywood should be a minimum of 7 16 inch thick. It is rot resistant with knots replaced with football. 7 16 15 32 and 1 2 inch thick panels require.
See doc ps 1 for plywood species groups. Glue is sprayed between each layer and the sheet is hot pressed. The minimum thickness you need for standard 16 inch on centers joists is 5 8 inches but 3 4 inch plywood makes a more stable floor and is a. Applicable to grade c c.