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Cross laminated timber (CLT) floor, roof, and wall panels are composed of alternating layers of softwood lumber laminations, with the laminations in one layer at a right angle to those in the adjacent layers.
The "longitudinal layers" refer to those CLT layers oriented the same way as the outermost layers, and "the transverse layers" to the other layers internal to the panel. For panels loaded laterally, loading in the "longitudinal direction" means that support is perpendicular to the longitudinal layers. This is also referred to as loading along the major strength axis. Loading in the "transverse direction" means support is perpendicular to the transverse layers and loading is along the minor strength axis.
Some CLT properties therefore have four values relating to the material used in the longitudinal and transverse layers, and the value of the property when loaded in the longitudinal and transverse directions.
For wall panels loaded axially, layers in the "longitudinal direction" means layers oriented vertically, and the "transverse direction" means those layers oriented horizontally. For lateral loading on wall panels, major axis design occurs when the outermost layers are vertical.