FAQ: What Thickness Of Plywood For Roof?

Which plywood is best for roofing?

CDX is the grade of plywood most commonly used for roofing (CDX plywood means it is Construction Grade for exterior purposes).

Is 7/16 OSB OK for roofing?

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 of 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 grade of plywood is used for roof sheathing?

1/2 or 3/4-inch Plywood for Roof Sheathing? – Traditionally, 1/2-in CDX plywood was common choice with 24-in rafter spacing. However, heavier roof loads may require the use of 3/4-in CDX plywood for roof sheathing. Roofs with less pitch often carry heavier loads, including snow and ice accumulations in the winter.

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Is CDX plywood good for roofing?

Only use CDX plywood for the interior of a house, where water damage is far less likely. 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.

Should I use OSB or plywood for roof?

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 thickness OSB should be used for roofing?

What is the Standard Roof Sheathing Thickness? 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.

What size nails should I use for roof sheathing?

Step 3: Fasten Roof Sheathing Panels Properly. Fasten panels with a minimum of 8d Common (0.131-inch by 2-1/2-inch) nails spaced a maximum of 6 inches on center at supported panel ends and edges. At intermediate supports, fasten panels 12 inches on center. In high-wind areas, more fasteners may be required.

How far can 1/2 inch plywood span?

Maximum span 24 inches for 15/32-and 1/2-inch panels.

Can you put 2 layers of plywood on a roof?

The new plywood will have to be nailed to the rafters or roof trusses. That increase in weight should not be a problem with the single layer of asphalt shingles you will be installing, because it is normally safe to assume the roof structure is built to support the weight of two layers of asphalt shingle roofing.

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Do I need pressure treated plywood for roof?

Pressure -treated lumber is one of the best options that you can use for a roof deck because of its extreme durability. If you are constructing a roof deck, you will need to be concerned with the amount of water that gets on the wood. Pressure-treated wood already has a built-in water resistance.

Do I need plywood on my roof?

Aside from shingles and underlayment, plywood decking is one of the most important components in your roof. The plywood decking is integral in keeping your home free of unwanted water and mold. If the plywood has gotten wet, it can have a disastrous effect on the rest of your roof, especially the shingles.

What is exterior grade plywood?

Exterior Grade Plywood, (also known as construction-grade plywood), is made from regular grade plywood sheets. Yet, these sheets have been fastened together using water-resistant ‘Exterior Glue’. Exterior grading is usually indicated by adding an ‘X’ letter to the standard grade of a sheet of plywood.

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