Next-generation lumber and mass timber products, such as glued-laminated timber (glulam), cross-laminated timber (CLT), dowel-laminated timber (DLT), and nail-laminated timber (NLT), along with a variety of structural composite lumber products, are enabling increased dimensional stability and strength, and greater long-span capabilities. To maximize the durability of mass timber buildings over time, design teams must carefully consider everything from deflection and drainage to airflow and breathability. During construction, weatherproofing and onsite moisture management are essential.