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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 roof?
or a non-laminated panel, such as this OSB. Either one is acceptable. The typical thickness of roof sheathing is about 7/16-inch, which is just under 1/2-inch. If you find 3/8-inch plywood installed as roof sheathing, it’s a good idea to make your client aware of its presence.
What is the minimum thickness for roof sheathing?
Sheathing must be a minimum of 19/32-inch thick. Never affix roof sheathing with staples; 8d ring-shank nails need to be used instead. The normal thickness range for sheathing is 3/8 to 3/4 inch.
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.
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.
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.
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.
Is OSB OK for shed roof?
For an inexpensive, value option 9mm OSB can be used for your garden shed roof. Start by fitting the beam across the top of the shed, slotting it into the pre-cut grooves at the top of the two pointed ends on an apex shed (known as the gable ends).
What thickness is OSB board?
Thicknesses are available from 6 mm (1/4 in) to 28.5 mm (1-1/8 in). Panels may be sanded on one or both faces on special order.
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.
What thickness is 15 32 plywood?
1/2-inch NOMINAL VS. ACTUAL SIZES 1/4-inch 11/32 1/2-inch 15/32 5/8-inch 19/32 3/4-inch 23/32.
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.
Is OSB or plywood better for roof sheathing?
Plywood Holds the Moisture Advantage Over OSB When plywood gets wet, it tends to swell. OSB takes longer than plywood to get saturated, but also takes much longer to dry out. When used as roof sheathing, this tendency to hold moisture means it will degrade faster than plywood when exposed to chronic leaks.
What do roofers put on the roof before they nail the shingles down?
Start by laying roof deck protection, or shingle underlayment, over the decking (plywood/OSB). Then, install new flashing (metal flashing is often called “drip edge” along the bottom of the roof near your gutters) and starter shingles at the edges. Nail the drip edge in place using your hammer and roofing nails.
Can you roof over tongue-and-groove?
Tongue and groove roof decking, especially the one from solid wood boards, is one of the two most common choices for residential use right now. The other one is plywood. In this article, we are going to discuss roof decking with T&G style from solid wood specifically.
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.
What type of OSB is used for roofing?
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.
