Tag Archives: Insulation

New IBC rules for insulation in unvented enclosed roof framing assemblies

Unvented roof systems, where the insulation and air barrier are applied directly to the underside of the roof deck, are common in applications where designers are seeking cost-effective and energy-efficient roof assemblies. However, designers of compact roof assemblies must consider vapor permeance and arrangement of the roofing materials to produce acceptable hygrothermal performance and low risk of condensation in the conditioned attic space. To this end, the 2015 version of the International Building Code (IBC) includes new provisions relating to unvented attic and unvented enclosed rafter assemblies that dictate how designers specify vapor retarders and placement of insulation in compact roof assemblies for condensation control.

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Next-generation precast insulated wall panels

Research is ongoing to advance precast concrete insulated wall panel technology by developing materials and design to double its thermal performance and reduce weight by half without increasing costs. The main goal of this project is to promote passive envelope technologies for improving energy efficiency in new construction.

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