Timber Construction Manual

Timber Construction Manual

The American Institute of Timber Construction (AITC) has developed this Timber

Construction Manual for convenient reference by architects, engineers, contrac-
tors, teachers, the laminating and fabricating industry, and all others having a

need for reliable, up-to-date technical data and recommendations on engineered
timber construction. The information and the recommendations herein are based

on the most reliable technical data available and reflect the commercial prac-
tices found to be most practical. Their application results in structurally sound


The American Institute of Timber Construction, established in 1952, is a non-
profit industry association for the structural glued laminated timber industry. Its

members design, manufacture, fabricate, assemble, and erect structural timber
systems utilizing both sawn and structural glued laminated timber components.
These systems are used in homes; schools; churches; commercial and industrial

buildings; and for other structures such as bridges, towers, and marine installa-
tions. Institute membership also includes engineers, architects, building officials,

and associates from other industries related to timber construction.

This manual applies primarily to two types of wood materials—sawn lumber
and structural glued laminated timber (glulam). Sawn lumber is the product of
lumber mills and is produced from many species. Glued laminated timbers are
produced in laminating plants by adhesively bonding dry lumber, normally of
2-in. or 1-in. nominal thickness, under controlled conditions of temperature and
pressure. Members with a wide variety of sizes, shapes, and lengths can be
produced having superior strength, stiffness, and appearance. In addition, heavy
timber decking, structural panels, and round timbers are also discussed.


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