The amount of weight on the roof is greatly affected by the number of shingle layers installed. In areas experiencing heavy ice and snow loads, thick plywood is required, unlike in areas where such factors are non-existent.
Like most other things, there is no one right answer for the plywood thickness of your roof. The answer depends mostly on how far apart the rafters are and the roof loads, which vary based on the pitch of your roof.
The standard sheet size for plywood is 4 x 8 feet, which strikes a good balance between being a reasonable size to work with and providing coverage of a fair surface area of the roof. Although not as common, larger sheet sizes of plywood are available.
It has a prominent grain that is coated by a system to make it hard as concrete. This kind is known for its firmness, resistance character, inflexible nature, and its hardness on the surface. Aircraft plywood, decorative plywood, tropical plywood, flexible plywood, and marine plywood are a few more things to investigate.
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 should a plywood roof overhang?
The overhang is multiple meaning that the sheeting you would overhang some 3/4-1 ” followed by a drip edge then if using shingles another 1″. If using metal w/o drip another 3/4-1″ past the wood sheeting. You would want to keep your completed overhang close to 1-1/2″ if using gutter.
How far should roof sheathing overhang fascia?
This indicates the upper edge of the first row of roof sheathing—leaving enough overhang that the subfascia and fascia will tuck neatly underneath when the time comes. Keeping this in view, how far should rafters overhang? Two feet is the general maximum length for a typical roof overhang.
One of the next things we asked ourselves was; how far should rafters overhang the roof?
One article claimed that two feet is the general maximum length for a typical roof overhang. This will protect a roof from most types of damage. Roof overhangs can extend farther than 2 feet, but beyond this length, they begin to lose structural integrity and require external supports.
What is the span rating of plywood?
The span rating provides a measure of the strength and stiffness in the direction parallel to the grain of the face and back veneers of the panel. The span rating on SHEATHING SPAN panels appears as two numbers separated by a slash (e. g, 32/16 or 48/24).
While I was researching we ran into the question “What size plywood do you use for floor joists?”.
For retrofitting older construction, 23/32- and 3/4-inch-thick panels can be used over 24-inch on center joists. The heaviest rating is for 7/8-inch-thick panels, for which joists can be spaced 32 inches on center.
How far can a sheet of 3/8 ply span?
The span rating doesn’t give you the design load limits as in a rafter or joist span table, just how far it can span. A sheet of 3/8″ ply may have a span rating of 24/16. but that doesn’t mean it can span 24″ oc rafters with a 50psf load.
How big can a 3/4 inch plywood shelf be?
My limit for 3/4″ plywood shelves is 32“, and I think that is pushing it for heavier objects. The other option is to have a stile in the middle of the span and put shelf supports on the stile and the backs of the cabinet, effectively cutting the shelf in two.