Plywood Floor Sheathing Thickness

Metric equivalents of panel dimensions note.

Plywood floor sheathing thickness.

The thicknesses are as follows. 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. The recommended shed floor plywood thickness is 3 4 inch pressure treated exterior grade cdx 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.

Panel selection handling and storage table 2. Applicable to grade c c. This type of plywood won t sag when used on a 12 inches joist structure. 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.

The wider the space between your joists the thicker your material must be as thicker material has a higher span rating. 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. Floor panels conforming with this table shall be deemed to meet the design criteria of section 2304 7. Usually these materials are either plywood or oriented strand board osb and are purchased in 4 by 8 foot sheets.

The required span rating is affected by the spacing on your floor joists. Applicable to all grades of sanded exterior type plywood. 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.

Sheathing over supports spaced up to 32 inches o c. Glue is sprayed between each layer and the sheet is hot pressed. It is rot resistant with knots replaced with football. Avoid using 1 2 inch plywood sheathing for a floor.