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Standard roof sheathing thickness is ½” to ⅝” thick. If you are using OSB for your roof deck, then ⅝” is the recommended thickness. For plywood, which is slightly stronger than strand board, ½” thick is appropriate. Another factor is how far apart your trusses or rafters are spaced.
Is 7/16 OSB OK for roofing?
Standard types of wood designed for roof sheathing are oriented strand board, known as OSB, and plywood, the most popular being OSB. Sheets of 7/16-inch thick, without edge support, can be used in an area where the snow load is 30 pounds per square foot.
What size sheathing should be used for roofing?
Most roofs will be sheathed in plywood at least 3/8 inch thick. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Loads will vary with the pitch of the roof; the flatter the roof, the greater the load on any one section. Steeper roofs will have lighter loads per square foot.
Is it OK to use OSB for roofing?
Both OSB and plywood panels can cut and installed on a roof using conventional roofing equipment. They have similar structural characteristics, and can be used interchangeably. OSB is now the most-used sheathing and subflooring material for new roofs and roof replacements.
What is minimum roof sheathing thickness?
For new construction, the roof decking shall be minimum 11 mm (7/16”) thick O.S.B. or minimum 12.7 mm (1/2”) thick plywood sheathing. When reroofing, plywood or O.S.B. roof sheathing shall be minimum 10 mm (3/8”) thick.
Which side of OSB goes up on roof?
OSB roof panels should always be installed with the grade stamp facing into the attic and the screened surface (with the nail guide lines) facing up. When the grade stamp is covered by roofing, the building inspector will not be able to confirm that the correct OSB roofing panel was used.
Can 7/16 OSB span 24 inches?
Wall panels 7/16 Category may be used on studs spaced up to 24” o.c. LP OSB sheathing panels are designed for use in roof, wall and subfloor systems in commercial and residential projects, maintenance, remodeling or new construction. OSB sheathing panels comply with the following industry standards and certifications.
Should you use tongue and groove OSB for roof sheathing?
Tongue & Groove Boards T&G roof decking, however, looks classy and rich. In fact, T&G boards are most frequently used when the sheathing is visible from the inside such as in cathedral ceilings or in some cabin-style homes, especially if the span of the rafters is greater than 2 feet.
How thick should sheathing be?
The U.S. Department of Energy has determined that 7/16-inch sheathing is the minimum appropriate thickness for structural wall sheathing with an exception for gable end walls, where the minimum thickness is 3/8 inch.
How Far Can 3/4 OSB span?
Span is permitted to be 24 inches on center where 3/4-inch wood strip flooring is installed at right angles to joist. Span is permitted to be 24 inches on center for floors where 11/2 inches of cellular or lightweight concrete is applied over the panels.
How thick should roof OSB be?
Standard roof sheathing thickness is ½” to ⅝” thick. If you are using OSB for your roof deck, then ⅝” is the recommended thickness. For plywood, which is slightly stronger than strand board, ½” thick is appropriate. Another factor is how far apart your trusses or rafters are spaced.
What kind of OSB is used for roofing?
Typical types of wood used for roof sheathing are oriented strand board, known as OSB, and plywood, the most popular being OSB. Sheets of 7/16-inch thick, with no edge support, can be used in an area where the snow load is 30 pounds per square foot. With edge support and the same snow load, 3/8-inch OSB can be used.
What is stronger OSB or plywood?
OSB and plywood offer similar (and sufficient) performance in terms of strength and functionality, though plywood is about 7% stronger. Plywood will absorb moisture quicker than OSB, but consequently it will also dry quicker.
What type of plywood is used for roof sheathing?
CDX Plywood A special grade of plywood called “CDX” is a popular choice for roof sheathing. No, the “X” in CDXplywood does not stand for “exterior.” Rather, it references the kind of glue used to bond the layers of veneer together. CDX plywood can withstand temporary exposure to rain and other moisture sources.
How far should roof rafters be apart?
But they do tend to space rafters in one of several industry-standard increments, typically either 12, 16 or 24 inches apart. These spacing intervals are measured “on center,” meaning that the measurement is taken from the center of one rafter’s horizontal surface to the center of the next rafter.
Is CDX plywood good for roofing?
Moisture Differences In reality, CDX plywood can only withstand water for a short period of time. Do not use CDX for roofing, sheds, or other places that are exposed to moisture consistently. The sole exception to this is pressure treated CDX, which can survive for decades without even a protective coating.
Will screws hold in OSB?
OSB will easily hold screws supporting jigs, misc tools, pegboard, etc. Most things I hang on the walls are a few pounds or less, which OSB easily supports. I try to screw into studs if hanging heavy objects like lumber racks, cabinets, etc. OSB has worked fine for my needs.
What’s the difference between OSB 2 and 3?
As from the mechanical properties point of view (MOR, MOE, internal bond) there is no difference between OSB 2 and OSB 3, it is the swelling rate that makes the difference between the panels and limits the domain of use for each type of board: Internal use in dry conditions (RH ≤ 65%) for OSB 2 → service class 1.
Should OSB be installed vertically or horizontally?
If the height of a wall is less than 8-feet, install the plywood (or OSB) vertically. If the height of a wall is greater then 8-feet, install the plywood (or OSB) horizontally.
