Plywood as a building material is very widely used due to its many useful properties. It is an economical, factory-produced sheet of wood with precise dimensions that does not warp or crack with changes in atmospheric moisture.

Ply is an engineered wood product made from three or more ‘plies’ or thin sheets of wood. These are glued together to form a thicker, flat sheet. The logs used to make plywood as a building material are prepared by steaming or dipping in hot water. They are then fed into a lathe machine, which peels the log into thin plies of wood. each ply is usually between 1 and 4mm thick.

USES OF PLYWOOD AS A BUILDING MATERIAL

Plywood has a huge range of used within the construction industry. Some of its most common uses are:

•     To make light partition or external walls

•     To make formwork, or a mould for wet concrete

•     To make furniture, especially cupboards, kitchen cabinets, and office tables

•     As part of flooring systems

•     For packaging

•     To make light doors and shutters

HOW PLY IS MADE

Plywood consists of the face, core, and back. The face is the surface that is visible after installation, while the core lies between the face and back. Thin layers of wood veneers are glued together with a strong adhesive. This is mainly a phenol or urea formaldehyde resin. Each layer is oriented with its grain perpendicular to the adjacent layer. Plywood as a building material is generally formed into large sheets. It may also be curved for use in ceilings, aircraft, or ship building.

WHICH WOOD IS PLY MADE OF?

Plywood is manufactured from softwood, hardwood, or both. The hardwoods used are ash, maple, oak, and mahogany. Douglas fir is the most popular softwood for making plywood, although pine, redwood, and cedar are common. Composite plywood can also be engineered with a core of solid timber pieces or particleboard, with a wood veneer for the face and back. Composite plywood is preferable when thick sheets are required.

Additional materials can be added to the face and back veneers to improve durability. These include plastic, resin-impregnated paper, fabric, Formica, or even metal. These are added as a thin outer layer to resist moisture, abrasion and corrosion. They also facilitate better binding of paint and dyes.

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