Every building enclosure serves as the critical barrier between indoor comfort and outdoor elements. The fundamental principle behind high-performance building design is the ability to control the flows of heat, air, liquid water, and water vapor across the building envelope. Understanding how polyiso insulation manages moisture alongside air and vapor control illustrates how these layers […]
Thermal imaging has become one of the most valuable diagnostic tools available to builders, energy raters, and homeowners seeking to understand how their buildings actually perform. As Randy Williams, an energy rater with over a decade of field experience, notes in his article on Green Building Advisor, infrared cameras are among the most-used tools in
Every penetration through a roof deck is a potential leak point. Plumbing vents, furnace flues, bath fan exhausts, and attic ventilators all punch holes in the roofing membrane, creating opportunities for water to find its way inside. When planning a re-roofing project, one of the most effective steps you can take is to identify which
Skylights bring natural light and warmth into interior spaces, but they also represent one of the most vulnerable points in a roof assembly. A poorly installed skylight can lead to chronic leaks, stained ceilings, and costly structural repairs. For years, builders relied on caulk and step flashing alone to keep water out, often with mixed
Housing a ducted minisplit system inside a conditioned attic offers a clever path to better energy performance in existing homes, especially those with open floor plans and varied room usage. Drawing on real experience retrofitting a 1961 ranch-style house near Atlanta, one building science expert demonstrates how thoughtful zoning, accurate Manual J load calculations, and
Installing a ducted minisplit system in a conditioned attic offers an excellent way to heat and cool a home while keeping mechanical equipment inside the thermal envelope. Unlike ductless wall-mounted units, ducted minisplits use a central air handler hidden in attic space to distribute conditioned air through a network of supply and return ducts. This
When you buy an older home, you inherit more than walls and a roof. You inherit every decision made by every previous owner, contractor, and handyman who touched the property. Some of those decisions were thoughtful and durable. Others were hidden behind drywall, buried under new slabs, or tucked inside ceiling cavities, waiting to be
When building a new home along the Northern California coast or in similar mild coastal climates, the roof assembly presents design decisions different from those in cold northeastern winters or hot and humid southeastern summers. Homeowners and builders in Climate Zone 3 face conditions that are hot and dry in summer, cool at night, and
Spray polyurethane foam insulation has been a transformative technology in building construction, offering superior air sealing and thermal performance that other insulation types struggle to match. Yet despite decades of use and refinement, spray foam remains one of the most misunderstood and inconsistently applied building materials on the market. Building enclosure specialist Henri Fennell, with
When you install a ductless mini-split heat pump system, the outdoor condenser unit often ends up sitting on a ground pad or wall bracket fully exposed to the elements. Most contractors will tell you that these units are designed to be weatherproof and do not require additional shelter. While that statement is technically accurate, it
