What are Mass Timber Products?

Engineered Wood Products

Modern mass timber buildings are constructed of engineered wood products, often manufactured from multiple layers of sawn lumber, attached to form a solid panel, beam, or column.

Mass Timber Difference

By forming solid wood sections, mass timber differs from the conventional, lightweight wood-framed construction that has long dominated the low-rise residential construction market in North America.


Multiple Products, One Structure

Multiple mass timber products can be used in the same structure.

The First Tech Credit Union used:

  1. Mass timber post and beam structure
  2. CLT roof
  3. CLT floors
  4. Framed exterior walls

Types of CLT

  • Cross-Laminated Timber

    Cross-Laminated Timber

  • Dowel-Laminated Timber

    Dowel-Laminated Timber

  • Glued-Laminated Timber

    Glued-Laminated Timber

  • Laminated Strand Lumber

    Laminated Strand Lumber

  • Laminated Veneer Lumber

    Laminated Veneer Lumber

  • Nail-Laminated Timber

    Nail-Laminated Timber

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Unique CLT Considerations


CLT panels are constructed of wood, a moisture sensitive material, that is slow to dry if wetted due to its hygric mass.


Wetting for prolonged periods can result in dimensional changes, moisture damage, and microbial growth


As a result, keeping CLT products dry during construction and throughout the building’s service life is critical


The speed at which CLT panels may be erected also creates unique field challenges where CLT panels are exposed to the elements for periods of time while awaiting cover.


VaproShield Membranes Offer Solutions

VaproShield’s sheet membranes are highly vapor permeable, simultaneously managing bulk water while allowing for some drying of underlying materials.



CLT Design Guide


Wall Details


Roof Details