For years, Design for Code Acceptance #3 (DCA3) has been the go-to resource for anyone working with I-joist assemblies. I-joist (WIJ) assemblies were added to DCA3 in 2001 and were intended to promote the usage of engineered lumber by simplifying the associated design, specification, and permitting processes.
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The current design of some wood-framed, non-ventilated roof assemblies in northern climates results in discontinuities in the vapor/air barriers, which allows moisture-laden air to migrate into the truss space and condense.
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Perhaps no other commercial design market is evolving faster than senior living. What started as a targeted push in the 1990s toward scaling down and decentralizing developments for the elderly—creating models less institutional in aesthetics for aging residents with challenges in health, cognition, mobility, and sensory abilities—has, in recent years, exploded into a full-on typology reboot.
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Wood ceilings can not only provide inviting, eye-catching aesthetics, but also effective acoustical control, making them a versatile and functional design element. To obtain the acoustic benefits, the panels must be perforated and backed with a sound-absorbing material.
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