Glued Laminated Timber is a structural timber product manufactured by gluing together individual pieces of dimension lumber under controlled conditions. The attributes of this wood product account for its frequent use as an attractive architectural and structural building material.
In the manufacture of glulam, the wood pieces are end jointed to achieve the full length necessary and arranged with grain parallel to the line of the timber, in horizontal layers or laminations. The wide faces of each board form the glue surface.
Laminating is an effective way of using high strength lumber of limited dimension to manufacture large structural members in many shapes and sizes. Glulam is used for columns and for beams and frequently for curved members loaded in combined bending and compression.
Glulam is manufactured at certified plants where standards governing lumber grading end joining, gluing and finishing are used to control quality. Qualified manufacturers can supply a certificate of conformance for their products upon request.
The lumber used for the manufacture of glulam is a special grade (lamstock) which is purchased directly from lumber mills. It is dried to a maximum moisture content of 15 percent and it is planed to a closer tolerance than that required for dimension lumber.
Glulam is a structural product used for headers, beams, girders, columns, and for heavy trusses. It is often used where the structure of a building is left exposed as an architectural feature.
Glulam can be manufactured to an almost limitless variety of straight and curved configurations. It offers the architect artistic freedom without sacrificing structural requirements.
Reuse as is, although may be subject to engineering assessment
Remanufacture into smaller dimension (engineering assessment)
Remanufacturing into other non-structural materials (flooring, moulding, etc.)
Glulam beams manufactured by APA members are certified with the APA EWS trademark. The mark signifies that the manufacturer is committed to a rigorous program of quality verification and testing and that products are manufactured in conformance with ANSI Standard A190.1-2012, Standard for Wood Products—Structural Glued Laminated Timber. The APA EWS trademark is recognized by all major model building codes.
cubic metres, board feet
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