FAQ: How To Lay Plywood On A Roof?

Do you have to stagger plywood on a roof?

Plywood panels should be laid with the face grain perpendicular to the rafter boards. The panels should be installed over two or more spans, with the long dimension or strength axis oriented across the rafter boards or truss cords. Staggering panels by at least two supports is recommended.

What direction do you put plywood on a roof?

A: According to APA—The Engineered Wood Association, wood panel sheathing should be oriented with their strength axis or face-grain direction perpendicular to the roof framing. This provides maximum stiffness and load capacity.

Can you use plywood 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.

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Why do you stagger plywood?

The end joint is where one board or plywood sheet butts up against another. In almost every situation, it’s important to stagger these joints to avoid straight lines that extend in a perpendicular direction across the lengths of the boards. This is a matter of appearance, but more importantly, it’s one of stability.

Does plywood have a strong direction?

So for 3- ply plywood, for instance, which has two face plies running parallel with the long dimension of the sheet, and a single central ply running perpendicular, most of the wood fibers are oriented parallel to the length of the sheet, so that is the plywood’s stronger direction.

Does it matter which way you lay plywood?

It is exceedingly important that the first whole line of plywood sheets be perfectly straight and square. Each subsequent piece of plywood will depend on the first piece being installed correctly. If you do this properly, you’ll have a beautiful plywood subfloor.

Should plywood be installed vertically or horizontally?

On roofs and floors, sheathing is installed perpendicular to supports because this is the orientation that results in the strongest roof or floor. Wind loads perpendicular to a wall are similar to floor and roof loads, and installing sheathing horizontally makes walls better at resisting wind pressure.

How thick should plywood be for a shed roof?

Roof and Floor If you want the shed to be waterproof, its roof must be constructed just like any other roof — a plywood decking covered with shingles or with composite or metal roofing. Most builders use 15/32 CDX for the roof; it is an exterior-grade plywood with a thickness just under 1/2 inch.

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What is the best wood to use for a shed roof?

Cedar or pine shingles can really be a lovely addition to your garden shed. Any type of wood shingle is going to be durable against most weather elements your shed will encounter. The natural use of wood for the roof can be a great choice, but there are some points to keep in mind. Wood shingles are not waterproof.

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 you put shingles directly on 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 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.

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. Add 10 percent to allow for waste.

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