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 thickness OSB should be 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.

What type 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.

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What is the best roof sheathing?

Builders love plywood for its water resistance, structural stability and low cost. They also love oriented strand board, though. It costs even less and is comparable to plywood on the other two counts, and they increasingly prefer OSB for roof sheathing. Either is an acceptable choice in most jurisdictions.

What’s the best plywood for roofs?

Most Common Thickness

For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. It will support roof loads for most situations and is the standard for most roof applications.

What is better for roofing 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.

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.

Can OSB get rained on?

Your framing lumber and the oriented strand board (OSB) are going to be fine. The glues used to make OSB are water-resistant because the manufacturers know that virtually no one can build a home that won’t get wet before the roof and siding is applied. … The OSB floors should be swept clean each day after work concludes.

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How much does a sheet of OSB cost?

OSB (Oriented Strand Board) Prices

in Inches in MM (rounded) Price per Sheet
1/4″ 6 $15 – $20
7/16″ 11 $20 – $25
1/2″ 13 $21 – $28
23/32″ 18 $26 – $32

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.

What is better for roof sheathing OSB or CDX?

At the end of the day, you should only really use CDX plywood for interior applications or surfaces that will not see much water. It isn’t ideal to use for sheds, roofing, or other areas that see consistent rain. OSB is ideal for these applications where the CDX simply will not work.

Should plywood go under metal roof?

For many applications, a layer of plywood underneath your metal roofing is an unnecessary expense. … Boards measuring 1 inches by 4 inches or 2 inches by 4 inches are commonly used for purlins, though never use treated lumber because it will corrode the steel roof and fasteners.

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.

How much does a sheet of roofing plywood cost?

Your price could vary depending on how much the roofing company charges for labor, but generally, you can expect to spend between $70 to $100 for each sheet of plywood. A 4 x 8 sheet of plywood covers about 32 square feet of roof area—and the average roof measures about 3,000 square feet.

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How much plywood do I need for a roof?

Divide the total roof area by 32 to get the number of sheets you will need to cover the roof. A typical 4 foot by 8 foot sheet of plywood covers 32 square feet. If your roof area is 1,600 square feet, 1,600 divided by 32 will mean you need about 50 sheets to cover the roof.

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.

Roofs and roofing