Glue-laminated timber, or glulam consists of sawn lumber laminations bonded with adhesive. The grain of all lumbers is aligned parallelly with the long direction.
Glulam can be
manufactured in various shapes, such as curve, taper and arch. It is often used
as a replacement for sawn lumber when there is a need for lumber with size
greater than 6” x 18”, in which the sawn lumber in such size is difficult to
obtain.
The nominal
thickness of lumber used in glulam is usually 1” and 2”. The moisture content
of lumbers usually lies within 10% to 16%.
A glulam is
stronger in longitudinal direction and weaker in transverse direction.
High-grader lumber is normally placed near the surface of glulam, while
low-grade lumber is placed near the center.
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