Plywood buying guide
Contractor-grade buying notes on Plywood: what to spec, what to skip, and how to keep the schedule on time.
Compare live Plywood prices across suppliers →Grade selection — AC, BC, CDX, and marine
Plywood grades describe the quality of the two face veneers (the higher letter first, the lower letter second), so an "AC" panel has one premium, paint-grade face and one sound-but-knotholed back; a "BC" panel has a near-finish face with small tight knots, and a backside with more visible repairs; "CDX" is the structural sheathing standard — C face on one side, D on the other, both sides exterior-glued (the "X"). CDX is what goes on roofs, walls, and subfloors when it will be hidden behind drywall, shingles, or tile. Marine plywood is built with a fully waterproof glue line and higher-grade veneers (typically A-B or A-A) with no voids in the inner plies — it is not rot-proof on its own, but the absence of voids is what keeps it from delaminating when wet, which is why it is the spec for boats, exterior signage, and roof-deck substrates in coastal builds. For finished interior work (cabinet backs, paneling, furniture-grade built-ins), AC or A-B is worth the premium because the face veneer will not telegraph through a paint or stain coat. For subfloor and wall sheathing where the panel is fully concealed, CDX at 1/2" or 5/8" thickness is the right tradeoff — upgrading to marine or BC sheathing is wasted spend because nobody sees the surface and the void-free inner plies add no structural value where loads stay within design limits.
MOQ tradeoffs for sheet goods
Minimum-order quantities on plywood are mostly a function of how the supplier buys from the mill: a Home Depot or Lowe's big-box buys by the truckload (32–42 units per bundle depending on thickness), so a six-sheet pickup order walks out the door with only a small price penalty compared to a 50-sheet pro order. Pro dealers like 84 Lumber build their pricing around the mill bundle, so buying under a full bundle triggers a small-order fee or a step-up to a per-sheet retail rate that can be 15–25% higher per sheet. The contractor playbook is to consolidate plywood purchases to truckload multiples whenever the schedule allows — one 40-sheet order per phase beats four 10-sheet runs to three different stores. The second lever is comparing MOQ tiers across suppliers on MaterialHQ before placing the order: a regional lumberyard may quote a 10-sheet minimum at near-mill pricing because they are willing to break bundles for pro accounts, while a national chain will refuse to negotiate under a bundle. During busy spring and fall framing seasons, mills prioritize full truckload customers, so even pro dealers will hold back the "broken bundle" inventory — contractors who plan four weeks ahead and order at bundle quantities consistently pay 8–12% less per sheet than contractors calling in mid-week for partial bundles.
Lead time traps — mill runs and regional availability
The single biggest lead-time trap on plywood is the mill run cadence: most US softwood mills cut CDX and OSB in 4–6 week production cycles tied to order book volume, which means "in stock today" can flip to "3-week lead time" between a Tuesday and a Wednesday if the next mill run sells out before the current one ships. The trap is most visible in two seasons — the spring framing boom (March through June) when residential builders surge, and the fall hurricane-prep season (August through October) when East Coast and Gulf dealers pull forward CDX inventory for roof replacement work. Regional availability swings are a second trap most contractors underestimate: OSB pricing is heavily influenced by Weyerhaeuser, LP, and Georgia-Pacific mill locations, so an OSB sheet that costs $32 in Atlanta can cost $39 in Phoenix because the closest mill is 1,200 miles away and freight gets baked into the per-sheet price. CDX has similar but smaller regional bands because most regions have at least one structural plywood mill within 400 miles. The contractor mitigation is twofold: check MaterialHQ stock status before placing the order (the `in_stock` flag rolls up across suppliers, so a "backorder" at one big-box but "in stock" at a regional yard is a clear signal of regional dislocation), and pre-order two weeks ahead of a known seasonal spike rather than reacting when the local yard shows zero inventory.