Quick Answer: What Type 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).

What thickness of plywood do you use on a roof?

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. Steeper roofs will have lighter loads per square foot.

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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What type of wood should be used for roofing?

Oriented strand board (OSB) – OSB is the most common type of material used for roof decking. It’s durable and readily available, and has relatively low costs. OSB is made of interwoven strands of wood bonded with adhesive.

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.

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.

Can I use 1/2 inch plywood for shed roof?

If the shed is for light tools then 1/2 inch pressure treated plywood is acceptable. If the shed is for heavier storage, then pressure treated 3/4 inch exterior-grade CDX plywood is the best.

What is the best thickness for roof sheathing?

The recommended thickness for roof sheathing is ⅝” thick. Sheathing with a thickness of less than that is much more likely to result in bowing between framing which could potentially compromise your exterior roof material.

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.

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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 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.

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.

What kind of wood do you use for roof rafters?

Kiln-dried Douglas fir wood presents the number one choice for building a rafter-styled roof in a wood frame house.

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.

Do I need treated timber for roof?

5 Answers from MyBuilder Roofers Hi, no you do not have to treat for something that doesn’t exist. Breathable felt and correct installation of the roof insulation will allow the timbers to stay dry and free from future rot.

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