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OVERVIEWSpray foam insulation has significant advantages over other insulation systems due to the spray foam ability to provide continuity of the water control, air control, vapor control and thermal… Read More

Houses are environmental separators – they keep the outside out and the inside in.   Houses have walls, roofs and foundations that each have to be connected to each other (Figure 1).  To function as… Read More

IntroductionThis guide provides information on how to construct vapor diffusion ports when using fiberglass and mineral wool insulation with conditioned unvented attics and unconditioned unvented… Read More

This guide provides mechanical ventilation requirements of occupied spaces in new low-rise residential buildings including single-family houses and multifamily structures such as apartment buildings… Read More

The purpose of this guide is to provide useful examples of high performance retrofit techniques for the building enclosure of wood frame residential construction in a cold and somewhat wet climate.… Read More

High performance precast concrete enclosure walls stand apart from most "rainscreen" walls in several key respects: how they control rain penetration, how they provide airtightness, and their… Read More

This guide provides the background and approach for the prep work necessary prior to adding attic insulation - focusing on combustion safety, ventilation for indoor air quality, and attic ventilation… Read More

This guide describes ways to meet the roof venting requirements as per building code while converting the attic into living space by moving the insulation to the underside of the roof deck between… Read More

This guide describes ways to attach siding in cases where wood sheathing is not used and provides prescriptive guidance on cladding attachment as per building code that allows cladding attachment… Read More