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General Limit States Design, Hygrothermal AnalysisAt a basic level a wall is an environmental separator.  It keeps the outside out and the inside in.  Easy to say, not always easy to do.To… Read More

* Credit to architect Edward Mazria: I think he said this first, if he didn't say it first he sure says it well.Many “green” buildings don’t save energy (see “MIS-LEED-ING” sidebar). Why? They have… Read More

This digest reviews the moisture control principles that must be followed for a successful insulated retrofit of a solid load-bearing masonry wall. Two possible approaches to retrofitting such walls… Read More

This research is a test implementation of an unvented tile roof assembly in a hot-humid climate (Orlando, FL; Zone 2A), insulated with air permeable insulation (netted and blown fiberglass). Given… Read More

This Technical Report describes the modeling of typical wall assemblies that have performed well historically in various climate zones. The provided information can be generalized for application to… Read More

There are many existing buildings with load-bearing mass masonry walls, whose energy performance could be improved with the retrofit of insulation.  However, adding insulation to the interior… Read More

This Measure Guideline describes a deep energy enclosure retrofit (DEER) solution for insulating mass masonry buildings from the interior. It describes the retrofit assembly, technical details, and… Read More

Double-stud walls insulated with cellulose or low-density spray foam can have high R-values; compared to approaches using exterior insulating sheathing, double-stud walls are typically less expensive… Read More

In cold climates, a common practice of the weatherization industry is to retrofit compact roof/ceiling assemblies with blown-in dense-pack cellulose. However, this assembly has high moisture and… Read More

In 2011, Building Science Corporation completed research work to support the development of standards for testing the airflow resistance of insulation materials used in dense-pack retrofit… Read More