General

6.3.1 Horizontal and vertical glued laminated timber

Glulam is formed by bonding timber laminations with the grain running essentially parallel and can be produced as horizontal glued laminated timber or vertical glued laminated timber, as defined in BS EN 386.

Horizontal glulam is glued laminated timber in which the glue line planes are perpendicular to the long length of the cross-section. Vertical glulam is glued laminated timber where the glue line planes are perpendicular to the short length of the cross-section. An example of each is shown in Figure 6.2.

6.3.2 Design methodology

Glued laminated timber must comply with the requirements of BS EN386 and BS EN1194:1999 [3]. BS EN1194 defines the strength classes associated with glulam and also states how the characteristic values of strength- and stiffness-related properties are to be obtained. It enables grades and species as well as combinations of grades and species to be classified using a glulam strength class system in a similar manner to that used in BS 338:2003 [4] for structural timber.

The classification system only applies to horizontally laminated glulam made with at least four laminations, all of which must be softwood. Strength classes are given for homogeneous and for combined glued laminated timber, and an example of each is shown in Figure 6.3.

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