Plywood consists of layers of wood veneer laminated together with the grain of the wood alternating direction on each layer. Plywood is used in a variety of applications. The two biggest uses are for sheathing and underlayment. Sheathing is literally the skin over framing members, either joists, studs or rafters. Underlayment is used as a secondary layer over a base layer to add a stiff flat surface for finish materials such as flooring or a tile countertop.
SHEATHING AND UNDERLAYMENT
| Size | Type | 1/4′ | 3/8″ | 7/16″ | 1/2″ | 5/8″ | 3/4″ |
| 4 x 8 | C.D.X |  | | | | ||
| 4 x 8 | O.S.B | | |||||
| 4 x 8 | Radiata A.C. | | | | | | |
| 4 x 8 | T & G Fir U.L. | | |||||
| 4 x 8 | Advantech | | |||||
| 4 x 8 | Edge Gold | | |||||
| 4 x 8 | Treated | | | ||||
| 4 x 8 | Fire Rated | | | | |||
| 4 x 8 | Zip Sheathing | | | | |||
| 4 x 8 | Radiata T111 | |
SPECIALTY PLYWOODS
| Size | Type | 3/16 | 1/4′ | 3/8″ | 1/2″ | 3/4″ | 1″ | 11/2″ |
| 4 x 8 | Marine | | | |||||
| 4 x 8 | Birch | | | | ||||
| 4 x 8 | C-2 Birch | | ||||||
| 4 x 8 | UL MDF | | ||||||
| 4 x 8 | MDF | | | | ||||
| 4 x 8 | Oak | | ||||||
| 4 x 8 | Primed MDO | | | | ||||
| 4 x 8 | Classic Plybead | | ||||||
| 4 x 8 | Beadboard Panel | |
PVC SHEETS
| Size | Type | 3/8″ | 1/2″ | 3/4″ |
| 4 x 8 | PVC | | | |
| 4 x 8 | PVC V-Bead | |