703.9 Sealing of Adjacent Mass Timber Elements
In buildings of Type IV-A, IV-B, and IV-C construction, sealant or adhesive shall be provided to resist the passage of air in the following locations:
Sealants shall meet the requirements of ASTM C920. Adhesives shall meet the requirements of ASTM D3498.
Exception: Sealants or adhesives need not be provided where a fire-resistance-rated assembly does not include them as a required component.