Super-Seal the Net Zero Building Envelope

Air sealing a home is generally considered the most cost-effective way to reduce space heating and cooling energy use. It also improves comfort, and indoor air quality. Achieving a high

Super-Insulate the Net Zero Building Envelope

…important to insulate the walls, floors, and ceilings with the type and thickness of insulating material that fits the specific needs of each surface, and to design wall, floor, and…

Wall Sensor Measures Moisture in a Double-stud Wall

…comparison of two high-R wall options. You could attach several inches of rigid insulation sheathing on the outside of the walls or build a thicker cavity using the double-stud approach….

Three Simple, Low-Cost, High-Performance Wall Assemblies

walls can be a serious issue in many climates, and high-R walls such as these can be more vulnerable. Exterior rigid insulation is the most robust system for preventing moisture…

High-R Walls, Part 1: Wall Assembly

double stud walls with plywood gusset. The only potential drawback to double wall construction is uncertainty about moisture condensation in thick walls. However my judgment over the last ten years…

High-R Walls, Part 2: Moisture Content

…you can’t go wrong with rigid insulation sheathing or with double-stud walls filled with fibrous insulation. While the double-stud approach does have advantages, it also has a potential drawback –…

Select Optimum Window Performance

While the energy efficiency of windows is highly technical, shopping for high-performance windows is made much easier by following standardized window performance measurements determined by the National Fenestration Rating Council…

The Mythical Threat to Double-Stud Walls

…out there for discussion. What follows is a surface-level look at what’s happening inside some of the double-stud walls Dan and I built together in Maine. Many of you may…

The Zero Energy Home Design Process

High-performance homes, especially those striving to achieve net zero energy performance , employ a number of energy efficient materials and construction practices that need to be integrated into the earliest…

Zero Energy Multifamily Buildings: Three Case Studies

…providing a great starting point for heating and hot water. 15% of the energy use was reduced through building super insulated walls and ceiling. The zHome’s R-38 walls are twice…

Improving Overall Wall R-Value With Windows

…many options for creating better insulated walls, such as staggered stud framing, double walls, or I-joist walls. These all allow for thicker, better insulated walls with a higher R-Value. However,…

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