Plywood span ratings indicate the distance between framing members for roofing and flooring. The span rating looks similar to a fraction and gives the roof span first and the floor span second. For example, 24/16 indicates that the distance between two framing members must not exceed 24 inches on a roof, and 16 inches on a floor.
How are plywood roof spans rated?
Plywood spans are rated by the thickness of plywood panels as well as the number of layers in the panel. The span ratings vary depending on grade quality from A through F (A being best) or WBP-grade roofing sheathing at SBS/CWPB ratings (SFP).
What is the purpose of a plywood span?
Plywood is a versatile building product that can be used for furniture, flooring, roof sheathing and more. Plywood spans are rated by the thickness of plywood panels as well as the number of layers in the panel.
What are span ratings for APA rated floor panels?
The Span Ratings for APA RATED STURD-I-FLOOR panels, like those for APA RATED SHEATHING, are based on application of the panel with the long dimension or strength axis across three or more supports. Tongue-and-groove — A system of jointing in which the rib or tongue of one member fits into the groove of another.
What does APA rating mean for plywood?
For example, an APA rated piece has a range between 15-51 inches per layer while wood I-beams can be 16" wide but only 31" long without supports. Span ratings are important because the strength of the plywood is based on its weight.
What is a span rating of 32 16?
A panel marked 32/16, for example, may be used for roof decking over supports up to 32 inches on center or for subflooring over supports up to 16 inches on center. strength axis across three or more supports (two spans).
What is the maximum span for 3/4 plywood?
h. Maximum span 24 inches where 3/4-inch wood finish flooring is installed at right angles to joists.
How far can you span 5/8 plywood?
2304.8 Floor and Roof SheathingPANEL GRADETHICKNESS (inch)MAXIMUM SPAN (inches)Structural I sheathing19/32, 5/82423/32, 3/424Sheathing, other grades covered in DOC PS 1 or DOC PS 27/161615/32248 more rows
How far can you span 3/8 plywood?
R503. 2.1. 1 Subfloor and Combined Subfloor UnderlaymentSPAN RATINGMINIMUM NOMINAL PANEL THICKNESS (inch)MAXIMUM SPAN (inches)16/03/81620/03/82024/03/82424/167/162412 more rows
What is span rating for OSB?
OSB is accepted by all North American building codes. There are different factors that determine what should be used. Support Spacing is one and the first number in a span rating i.e. 24/16 is the maximum support spacing for roof/wall applications.Nov 5, 2015
What does APA rated plywood mean?
APA Rated Sheathing is rated for use as subfloor, wall, roof, diaphragm and shear wall sheathing. It is suitable for use in a range of construction and miscellaneous applications where strength and stiffness are required. 2.1 Adhesive Bond Classification.
Is 7/16 OSB OK for roofing?
OSB is the most-used sheathing material for new roofs and roof replacements. You can use 7/16-inch thick OSB sheets without support for areas where the snow load is 30 pounds per square foot because it's durable and maintains building integrity much longer than other sizes.Mar 15, 2022
How far can you span 7/16 OSB?
Wall panels 7/16 Category may be used on studs spaced up to 24” o.c. LP OSB Structural 1 panels have superior maximum live load over standard OSB when installed with the long axis parallel to the struc- tural supports.
APA Panel Trademark
A printable copy illustrating and explaining the APA Panel Trademark is available for download below.
About APA
For nearly 90 years, APA – The Engineered Wood Association has focused on helping the industry create structural wood products of exceptional strength, versatility and reliability.
What is APA rated plywood?
APA Rated Sheathing panels are produced as plywood or oriented strand board (OSB). Typical size is 4 ft x 8 ft, but other sizes may also be produced. Commonly square edge, but may be produced with tongue and groove edges.
What is APA sheathing?
APA Rated Sheathing is rated for use as subfloor, wall, roof, diaphragm and shear wall sheathing. It is suitable for use in a range of construction and miscellaneous applications where strength and stiffness are required.
