There is no application on the planet where having a plywood sheet larger than 4'x8' is necessary. whatever application you think this is, you should either reframe the project so that 4x8 plywood is fine, or you should not use plywood.. But identical thickness and overall properties plywood in bigger sheets will typically cost less per square foot than smaller pieces. it is always be cheaper to buy one 4’ x 8’ sheet and cut it comparing to paying for four 2’ x 4’ pieces. how heavy the plywood is.. I'm not aware of any source for any type of plywood with a single, integrated panel bigger than a 5' x 12' layup. in marine plywood, make that 4' x 8'. some suppliers - check boulter in mass. or edensaw in washington - will supply factory-scarfed sheets up to 4' x 16'..
Other than that, i'd suggest you think over what you intend to do with the product. you can often find osb (or partical board) in sizes larger than 4x8 easier than you can find plywood. if you are going to veneer, laminate, or paint over the product, then you can use 2 pieces (or more), and connect them.. I haven't gone to home depot or lowe's yet, but my understanding is that the largest plywood sheets you can get are 4' x 8'. someone has mentioned to me in passing you can get one custom cut, but if the dimensions are larger than the sheets the store gets from the factory its no use.. I basically cut 3" x 1/2" strips of mdf and made a frame that is 8' x 6', with a piece backing the joint of the seam of the 4 x 8' sheet and the 2' x 8' sheet - overlapping the 3" backing by 1 1/2" for each sheet, using enough glue to ensure a good squeeze out at the joint (to fill the joint)..
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