MASS TIMBER | A highly adaptable, strong and sustainable. While its combination of structural performance, flexibility in design, and aesthetics are enough for many designers, mass timber has numerous other advantages. Mass Timber Products Cross-Laminated Timber (CLT) Glued-Laminated Timber (Glulam or GLT) Laminated Veneer Lumber (LVL) Nail-Laminated Timber (NLT) Structural Composite Lumber (SCL) Dowel Laminated