Question: Do You Use Treated Plywood For Roofs?

What is the best option for roof decking?

Plywood is another popular choice for roof deck construction.

Because plywood is made with many sheets of interwoven wood, it provides a thickness to a roof deck reducing swelling, shrinking, and warping over time..

What kind of wood do you use for roof rafters?

Douglas fir woodKiln-dried Douglas fir wood presents the number one choice for building a rafter-styled roof in a wood frame house. This tree grows prodigiously in the Pacific Northwest. Since it is readily harvested in substantial quantities, the price is reasonable.

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.

Are roof decks worth it?

A roof deck adds outdoor living space to your home, but make sure you’ll enjoy it often enough to make it worth the cost. … Make sure you have space for a staircase to the roof rather than a less functional ladder or spiral staircase.

What thickness of plywood is used for roofing?

5/8-inchMost Common Thickness 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. Roofs with very heavy loads may require 3/4-inch thickness.

What type of wood is used for rafters?

Rafters are usually made of pine or cedar. For longer span rafters, building materials manufacturers have created LVL (Laminated veneer lumber) rafters that can be 2–5 times longer than typical wood rafter.

Can Plywood be waterproofed?

Plywood is a laminated material that accepts waterproofing easily. When plywood is used in any capacity outdoors, waterproofing prolongs its life. Since plywood is made by gluing layers of wood together and finishing it with a veneer, the layers are vulnerable to water damage.

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.

Is OSB cheaper than plywood?

A simple trip to the average lumberyard or home supply store is all it takes to realize that OSB is almost always cheaper than plywood. … “For a typical 2,400 square foot home, OSB will save about $700 if used as the subfloor, sheathing, and roof decking instead of plywood.”

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 type of wood is best for roofing?

Cedar ShinglesCedar Shingles 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.

Can you use galvanized screws in pressure treated wood?

Mechanically galvanized screws are generally suitable for decks and other outdoor projects made of pressure-treated lumber. Nevertheless, you should not use them with PT lumber in contact with the soil, in high-moisture areas, or in areas with salt content in the air.

What should I use to seal plywood?

So, what is the best plywood waterproof sealer? If you want to waterproof plywood, then coat it with a quality liquid latex sealer. The sealer protects by wrapping plywood in a plastic water-resistant covering. However, you can give plywood even better water-proofing by sealing it with Aquarium sealant.

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.

Do I need treated timber for roof?

The simple truth is that you do NOT need to treat timber. … The same goes for actual rot by fungus – timber is simply NOT going to rot if it is kept dry.

What type of plywood is used 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.

Can I use pressure treated wood for roof rafters?

As long as the rafters are not directly exposed to the elements, no need to be treated. Treated is generally for ground contact or exposed to the elements or high humidity areas.

What is the best material for roof sheathing?

Oriented Strand Board DecksOriented Strand Board Decks (OSB) OSB is a type ofRoof sheathingthat is quickly becoming the preferred option for roof sheathing. This is due to the fact that it is less expensive than other options, and it is very durable.

What is the minimum thickness of roof sheathing?

19/32-inchRoof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. Sheathing should be a minimum of 19/32-inch thick. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. The typical thickness range for sheathing is 3/8 to 3/4 inch.