Can you roof 3/4 plywood?

Since the most common rafter spacing is 24 inches, the standard plywood recommended for most roofing situations is 5/8-inches since it supports roof loads for most situations. However, a 3/4-inch thickness can be used for roofs with heavy loads.

What thickness plywood is used for roofing?

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 kind of plywood do you use for roofing?

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

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.

Is plywood good for roofing?

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.

DON'T USE 3/4" PLYWOOD If You Don't Need It...TRY THIS! (1/2" Plywood Vs. 3/4" Plywood--When to Use)

Can you roof 3/4 plywood?

Since the most common rafter spacing is 24 inches, the standard plywood recommended for most roofing situations is 5/8-inches since it supports roof loads for most situations. However, a 3/4-inch thickness can be used for roofs with heavy loads.

What ply should I use on a flat roof?

A flat base is required to lay the roof covering on. This can be either Smartply OSB3 or good quality, structurally sound WBP plywood. A minimum thickness of 18mm must always be used.

How Far Can 3/4 plywood span roof?

Maximum span 24 inches where 3/4-inch wood finish flooring is installed at right angles to joists.

What size sheathing is used for roof?

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

What is the best sheathing for a roof?

What Type of Sheathing Is Best for a Roof? Oriented Strand Board, OSB, is currently the best choice for roofs. It's durable, water-resistant, and very cost-efficient. It also has a very consistent thickness, so you don't have to worry about weak or uneven spots.

How much is a 4x8 sheet of roofing plywood?

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.

Which is stronger OSB or plywood?

Osb is stronger than plywood in shear. Shear values, through its thickness, are about 2 times greater than plywood. This is one of the reasons osb is used for webs of wooden I-joists. However, nail-holding ability controls performance in shear wall applications.

Can you roof sheath with OSB?

OSB is now the most-used sheathing and subflooring material for new roofs and roof replacements. OSB is currently selling for less than plywood by approximately $3 per sheet, meaning a savings of several hundred dollars per conventional home.

Is 7/16 OSB OK for roofing?

OSB is the most-used sheathing material for new roofs and roof replacements. You can use 7/16-inch thick OSB sheets without support for areas where the snow load is 30 pounds per square foot because it's durable and maintains building integrity much longer than other sizes.

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 long does roof plywood last?

How long does roof plywood last? Roof plywood should last twenty years, so long as it is not exposed to water.

Is roof sheathing the same as plywood?

It is a very valid question in all respects, but roof sheathing cannot be the same as plywood. They are different because roof sheathing is the word used to refer to the process of protecting the roof, while plywood is one among many of the materials installed to provide roof sheathing or protection to the top.

Which wood is best for roofing?

Cedar has earned a reputation for being strong, flexible, and weather resistant – qualities that make for an effective roofing shingle. Among roofing shingle manufacturers, cedar is the go-to material, all thanks to its durability.

How much weight can a 3/4 in plywood hold?

A 12-by-36-inch piece of 3/4-inch fir plywood can easily support 50 pounds. However, a 12-by-36-inch piece of 1/4-inch thick plywood will not support that much weight. It will only support about 5 pounds before bending.

What size rafters do I need for a 12 foot span?

As per general rules and guideline, for 10 -12 foot span, generally you need 2″×6″ size of rafter, for 15 -16 foot span, you need 2″×8″ rafter, for 18 – 20 foot span, you need 2″×10″ rafter & for 24 foot span, you need 2″×6″ size of rafter placed at 16″ apart from centre.

What does it mean if plywood has a span rating of 24 0?

Panels and lap siding bearing a Span Rating of 24 oc may be used direct to studs 24 inches on center. All RATED SIDING panels may be applied horizontally direct to studs 16 or 24 inches on center provided horizontal joints are blocked.

Can you use plywood instead of OSB?

Industry voices from panel manufacturers or their main trade group—APA – The Engineered Wood Association—say that there's no real difference between the two panels: OSB's and plywood's structural characteristics are equivalent, and they can be used interchangeably.

How thick should flat roof insulation be?

An uninsulated flat roof has a U-Value of around 1.5 W/m2K. When insulating one, you're aiming for a value of 0.25 W/m2K or less. To achieve this, you should insulate your flat roof with insulation boards totalling around 150mm thickness.

What is better 3 ply or 4 ply plywood?

Overall Strength and Durability

Perhaps one of the biggest differences here is that 4-ply plywood is much stronger and more durable overall than 3-ply plywood. The reason for this is because it has one extra layer that is perpendicular to the others.