Is half inch plywood good 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 size plywood do roofers use?

5/8-inch plywood is the most common choice for roofing with 24-inch rafter spacing. It's also the standard for most roof applications because it supports roof loads in most situations.

What type of plywood should be used for roofing?

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

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.

What grade of plywood is used for roof sheathing?

CDX Plywood is used primarily by contractors to build exterior walls and roofs. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. The two are bonded together with glue which can withstand a little moisture. The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood.

OSB vs. Plywood: Which Should You Choose for Your Roof Deck?

What is the minimum thickness of plywood for a roof?

Minimum Thickness

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.

What is the best thickness for roof sheathing?

The normal thickness range for sheathing is 3/8 to 3/4 inch. Multiple factors should be taken into account when determining appropriate roof sheathing thickness, like the span of roof joists and snow load for the area.

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 long does roof plywood last?

Plywood siding, such as T-111 should give at least a 35 year life expectancy, if finished properly; but there are many cases of it lasting over 50 years. Roof sheathing should last 30 to 40 years or to put it another way, two roofs.

How thick is a roof?

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

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.

How much is a sheet of plywood for roofing?

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.

What should I use for roof sheathing?

Oriented Strand Board (OSB) or plywood can be used, although plywood will provide higher nail head pull-through resistance. Use panels rated as “Exposure 1” or better. Install sheathing panels according to the recommendations of the Engineered Wood Association (APA). Use panels no smaller than 4 feet long.

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 much does a 4x8 sheet of plywood cost?

The average cost of a 4×8 plywood.

The cost will vary depending on what size you are looking for. A 4×8 sheet that's 1/4 inch thick could cost you anywhere from $6 to $45, while an 11/32″ thicker one would run about $15 dollar to $120 per sheet of the same size.

Can I put plywood over old roof?

Although I don't think installing new plywood roof sheathing over the old would be a grave mistake, I would not recommend doing it, for several reasons. The new plywood will have to be nailed to the rafters or roof trusses.

Can you roof over wet plywood?

A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing. Trapped water will boil when the sun heats the roof and the shingles will then have small pits where the steam finally escapes.

How thick is plywood on a roof?

What is this? 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 is the longest lasting roofing material?

Roofing material that lasts the longest are concrete, clay or slate tiles. These materials significantly outperform other natural products like wood shakes or any manufactured roofing materials including asphalt shingles and metal roofing. Although these materials have a good lifespan, they are not as durable.

How long do wood roofs last?

A well-maintained wood shingle roof should last 15 to 30 years, depending on the quality of the shingles or shakes.

What is the most common roof sheathing?

Sheet decking

OSB (oriented strand board) is the most common type of decking used on roofs today. It's made up of wood chips/strips compressed together to form a flat 7/16” sheet. Plywood comes in several different thicknesses (⅜”, ½”, ⅝”, and ¾”) depending on the span of the rafters.

Is OSB OK 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.

How thick is a roof slab?

Slabs generally range from 5 to 14 inches in thickness. Spans are up to 35 feet, but may be extended by p o s t - t e n s i o n i n g .

Is it better to nail or screw roof sheathing?

Nails are often preferred for structural joining, including framing walls, because they are more flexible under pressure, whereas screws can snap. Nails are also called upon when securing plywood sheathing for exterior walls, installing hardwood floors, and attaching siding and roofing.