How thick is typical roof sheathing?

The typical thickness of roof sheathing is about 7/16-inch, which is just under 1/2-inch.

What is the minimum thickness for roof sheathing?

Roof Sheathing Code Requirements

The minimum requirement for roof sheathing is ⅜” thick. There is no upper limit on how thick your roof substrate is. Thickness allowed depends on how far apart rafters or trusses are spaced and the rating of your roof decking.

What thickness of plywood is used for roofs?

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.

What type of sheathing is used for roofing?

Roof sheathing is usually made of either oriented strand board (OSB) or plywood. Both materials are made of wood, but OSB is more lightweight and costs slightly less. Plywood is very durable but tends to cost a bit more and is heavier.

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What kind of plywood is used for roof sheathing?

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.

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 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.

Is OSB stronger than plywood?

Wood fiber is used more efficiently in osb. Osb is stronger than plywood in shear. Shear values, through its thickness, are about 2 times greater than plywood.

Do I need plywood on my roof?

Sometimes referred to as roof sheathing or a roof deck, this plywood acts as a foundation for the layers of underlay and the shingles on your roof and connects the roof to the frame of the house. Even though it isn’t visible, it is very important to the structure of your home.

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Do you use treated plywood for roofs?

Contractors generally recommend treated plywood rather than regular plywood for roof decking because condensation can build up on the sheathing and cause rot. Roofers understand that when it comes to the roof deck, the amount of water that gets on the wood is a concern.

Which is better for roof sheathing OSB or plywood?

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.

Can I use screws for roof sheathing?

Screws can be used for even greater withdrawal strength, but should be sized by the building designer. Staples are not recommended for roof sheathing attachment in high-wind areas. … Oriented strand board (OSB) is one of the most popular materials for roof sheathing.

Do you glue roof sheathing?

Unlike flooring, DO NOT glue roof sheathing. Drive nails flush to the panel.

What is the difference between OSB and plywood?

OSB is made of many smaller pieces of hardwood and softwood mixed together in strands. Because the pieces are smaller, the sheets of OSB can be much larger than sheets of plywood. While plywood is often 6 feet per sheet, OSB may be much larger, up to 12 feet per sheet.

Is sheathing the same as plywood?

Plywood sheathing (OSB or plywood) is often mistaken for plywood underlayment. They are not the same. Plywood sheathing is most often used to construct the structural sub-floor. Plywood sheathing can either be OSB or all plywood.

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Roofs and roofing