APA Q220AA PDF

INTRODUCTION

Most construction applications don't require preservative-treated wood. But in some uses, and in certain climates, treated wood is recommended or required by local building codes to protect against decay, fungi, termites, carpenter ants or other wood-destroying insects, or from marine borers in sea-water exposure.

Preservative-treated plywood is impregnated with preservatives by a pressure process. The resulting deep penetration of preservative provides protection against decay and insect attack.

Non-pressure preservative treatments are available, but superficial applications provide limited protection. Pressurepreservative- treated plywood is used in a variety of applications.

■ Wood foundations

■ Bulkheads

■ Retaining walls

■ Highway noise barriers

■ Irrigation structures

■ Cooling towers

■ Electrical transformer vaults

■ Decks, docks, piers and floats

■ Tanks

■ Liquid manure storage tanks

■ Planters

■ Food transport, processing and storage

■ Roof, wall, and floor sheathing in tropical regions or applications where resistance to termites or decay is required.

Preservative-treated plywood maintains stiffness and strength, thermal properties, workability, light weight and economy.

Wood preservatives and wood treated with these chemicals should be used and handled appropriately (see Intended End-Use Service Conditions and Use and Handling Precautions). Always follow the recommendations provided by the preservative manufacturer or wood treating company.