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Cross-laminated timber (CLT)

Cross-laminated timber (CLT) is a solid wood panel made from layers of boards glued crosswise, each layer at right angles to the one below.

Also known as CLT, X-lam, cross laminated timber panel, mass timber

Crossing the layers makes the panel strong and dimensionally stable in both directions, so CLT can act as a load-bearing wall, floor or roof slab in its own right. Panels are produced in large formats and CNC-cut to shape, openings included, before delivery.

CLT is a mass-timber system, as opposed to a framed one: the structure is solid wood rather than studs with insulation between them. It is widely used in multi-storey timber buildings, often combined with glulam beams and timber-framed infill walls.

Related terms
GlulamGlulam (glued laminated timber) is a structural timber product made by gluing layers of timber together with the grain running in the same direction. Timber frameTimber frame construction builds walls, floors and roofs from a framework of timber studs, joists and rafters or trusses, closed with boards. Infill wallAn infill wall is a non-load-bearing external wall fitted between the floor slabs or frame of a building, closing it in without carrying its structure.
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