Plywood and Sheet Goods

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Plywood1. Finish plywood
2. Sheathing plywood
3. Strandboard
4. Plastic laminate (bonded to particleboard)
5. Waferboard
6. Particleboard

    There are many different types of sheet goods, but plywood is the most widely used. Plywood is an extremely versatile sheet material that is made up of thinly sliced layers or plies of wood. Plywood is available in thicknesses ranging from 3/16″ to 3/4″ and is graded A through D, depending on the quality of the wood in its outer plies. It is also graded for interior or exterior usage. Classifications for plywood are based on the wood species used for the face and back veneers. Group 1 species are the strongest and stiffest, Group 2 is the next strongest.

Finish plywood is graded either A-C, meaning it has a finish-quality wood veneer on one side and a utility-grade ply on the other side, or A-A, indicating it has a finish veneer on both sides.

Sheathing plywood is graded C-D with two rough sides and features a bond between plies that is waterproof. Plywood rated EXPOSURE 1 is for use where some moisture is present, and plywood rated EXTERIOR is used in applications that are permanently exposed to weather.

Sheathing plywood

Sheathing plywood also carries a thickness rating and a roof and floor span index, which appear as two numbers separated by a diagonal slash. The first number, for roofing application, indicates the maximum spacing for rafters. The second number specifies the joist spacing when plywood is used for subflooring. Some plywood is stamped “sized for spacing.” This means that the actual dimensions are slightly smaller than 4 x 8 feet to allow space for expansion between sheets after installation.

Plastic laminates

1. Plastic foam insulating board
2. Water-resistant drywall
3. Drywall
4. Pegboard
5. Hardboard

Plastic laminates make durable surfaces for countertops and furniture. Plastic laminates are sometimes bonded to particleboard for use in shelving, cabinets, and countertops.

Strand-, particle-, and waferboard are made from waste chips or inexpensive wood species and are used for shelving and floor underlayment. Foam insulating board is lightweight and serves as insulation for basement walls.

Water-resistant drywall is used behind ceramic wall tiles and in other high-moisture areas. Drywall, also known as wallboard, Sheetrock, and plasterboard, comes in panels 4-feet wide, 2-,
4-, 8-, 10-, or 12-feet long, and in 3/8-inch, 1/2-inch, and 5/8-inch thicknesses.

Pegboard and hardboard are made from wood fibers and resins bonded together under high pressure and are used for tool organization with a workbench and as shelf backing.

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