Cross Laminated Timber is relatively new to the industry, but some manufacturers are going to the effort of making the panels air-tight in fabrication.
Important considerations for Cross Laminated Timber application:
May be able to act as multiple layers - structure, vapour retarder, air barrier, and finish
Long lengths of panel may make for quick closing in of buildings and ease of install for windows and doors
Some manufacturers provide milled precision for edges and openings, adding uniformity to air barrier continuity.
CLT panels are very heavy. Specialized installation with a crane truck is required.
A plan must be made for service cavities, chases or bulkheads to be added for utilities.