Air Leakage in Multifamilys

Multifamily buildings usually have relatively tighter enclosures than single-family homes. They also have less exterior surface area per unit of floor area. Furthermore, the multifamily-building exterior is often quite weather-tight to resist rain and wind....

What is Draft

What is draft? Draft is important to combustion efficiency and safe combustion. If draft isn’t adequate, chimneys can backdraft or spill.  We measure draft between between two places in a combustion heating system. For example, we measure draft between the a...

LBNL “Smart Ventilation” Research

Lawrence Berkeley National Lab (LBNL) scientists, led by Max Sherman and Iain Walker, are investigating whole-house ventilation options to support California’s Zero Net Energy Homes initiative. This research project is called Smart Ventilation for Advanced...

Sliding Glass Doors: Comfort and Energy

Sliding glass door heat flow A sliding glass door’s large expanse of glass transmits a lot heat out of the home in the winter and into the home in summer. This heat flow takes three forms: heat conducts directly through the glass in winter, solar heat transmits...

Attic Vents and Venting – Part 1

Attic vents and roof venting serve a variety of purposes, depending on roof design and climate. These purposes include preventing ice damming, drying building materials, and controlling solar heat gain. In cold climates, we want to avoid ice damming by keeping the...

Installing High-Performance Windows

My complements to the European high-performance window manufacturers for providing built-in sills for their windows. I hope that North American high-performance window manufacturers soon provide built-in sills. The built-in sills, along with block-frame window...