osb roof sheathing thickness 24'' oc

You could cover it with 1/4 osb and 1" sheetrock screws. 1/2- inch OSB or plywood roof sheathing is often sold with other thicknesses such as 7/16- inch or 15/32-inch. Panels are designated by span rating and thickness for sheathing panels (including structural 1 sheathing) in span ratings of 24/0, 24/16, 32/16, 40/20 and 48/24 and single floor panels in span ratings of 16 oc (maximum “on center” support spacing for single-layer floor applications), 20 oc, 24 oc, 32 oc and 48 oc. 10 psf dead load assumed. Pretty sure 1/2" is ok for 14" OC, 3/4" is up to 24" ... Airport, and that was for sound, not strength. If the APA stamping is visible you should see a notation indicating o.c. Stagger the joints. 3/4" ply will span 36" between supports. APA Rated OSB Sheathing Roof Panels Performance Category* APA Span Rating Allowable Live Load for Roofs (psf)** 3/8 24/0 30 7/16 24/16 40 15/32 32/16 70 1/2 32/16 70 19/32 40/20 130 23/32 48/24 175 1-1/8 48 oc 290 * Performance Category replaces the nominal panel thickness ** Live load for 24” oc span conditions. However, if there is ever a roof leak I think the Cdx holds up better. When this is the case, experts recommend a 5/8-inch-thick sheet. Keep in mind that the load of the roof still plays a role in the plywood thickness. Using OSB. A flatter roof with rafters farther apart may need a thickness of up to ¾ inch. whether or not the sheathing has clips. What H-Clips Do. If you insist on additional sheathing I wouldn't strip off the current plywood. Numerous choices are available for this purpose, but the two most commonly used products are oriented strand board (OSB) and plywood 1.Both boards are made of wood with glues and resins, come in many sizes, and can be used for a variety of purposes. live and total loads; OSB/plywood is allowed to span 60" maximum with clips (7/8” thick sheathing) and 48” maximum without clips (7/8” thick sheathing). for flooring. IRC 2009 (and 2006) Table R503.2.1.1(1) gives the maximum spans for roof sheathing based on: the thickness of the sheathing. Whether you are building, remodeling, or just doing some repairs, many times you need a type of sheathing or underlayment for the project. These little changes can effect the maximum spans allowed by code and you can find the label stamped on the sheathing. Roof Sheathing Thickness. Drywall screws would pull everything up tight. H-clips provide additional stiffness between bearing points for the unsupported edges of wood panel (plywood or OSB) roof sheathing, along with the necessary 1/8” gap for expansion, as shown below illustrated on a bag of Simpson H-clips. APA Rated Sheathing panels are produced as plywood or oriented strand board (OSB). Typical framing details are to use 7/16" OSB for roof framing on 24" centers. Commonly square edge, but may be produced with tongue and groove edges. OSB comes in 4-by-8-foot sheets, as does plywood, but the manufacturing process allows the production of longer and wider ones. Most builder's use 7/16"osb with clips if a heavy roof covering applied or called for on plans. I only use 1/2" OSB on roof sheathing, but the APA rating of the OSB does allow for 24" centers Now the fact that you are on 16" centers, 7/16" would be fine (although I probably would still use 1/2" out of habit). Re: Plywood Thickness for 24" OC Rafters I have worked with Cdx, generic osb and advantech. As far as installation goes I much prefer using osb or advantech over ply simply because it lays flat and doesn't warp/curl like Cdx. 2.4 Common Performance Categories And Corresponding Span Ratings Performance Category Span Rating 3/8 24/0 7/16 24/16 I believe 24" oc is fine for 1/2". for roofing, o.c. Many homes have rafters that are even wider at 24 inches apart and will require a thicker sheet of plywood. Page 6 of 7 V1.0 – 01/2008 OSB Roof Design Example Calculations Using ASD 4x8 foot, 24/16 TECO SHEATHING SPAN® ® ® = = = = = = I would first verify what you actually have by looking for a stamp on the roof sheathing. Typical size is 4 ft x 8 ft, but other sizes may also be produced.

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