FAQ: How To Put Plywood On A Roof?

Should you 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.

How do you get heavy plywood on a roof?

Take two 2x4s long enough to extend above the roof line by about 2′. Attach another section of 2×4 across them to hold them together at a height that will allow you to stack the plywood on it so that the top of the plywood sticks up above the top of the jack stand at the roof line.

How many sheets of plywood do you 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.

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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.

How thick should roofing plywood be?

Asphalt shingle application directly over dimensional lumber is not permitted. For new construction, the roof decking shall be minimum 11 mm (7/16”) thick O.S.B. or minimum 12.7 mm (1/2”) thick plywood sheathing. When reroofing, plywood or O.S.B. roof sheathing shall be minimum 10 mm (3/8”) thick.

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 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.

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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 roof sheathing go over fascia?

When sheathing a roof, the first step is to snap a line so that the first row goes on straight. But if you snap it at 40 inches, then the sheathing will not project over the subfascia or true fascia.

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