Jul 24, 2011 · Building Science Fundamentals: Roof, Part 1: Ventilation By Dr. Joseph Lstiburek Dr. Joseph Lstiburek talks about the not-so-controversial ways to maximize the efficiency and …

May 28, 2021 · The problem is attic ductwork The main reason that anyone talks about conditioned attics is that some builders want to install ducts in the attic. Installing ducts in an …

Feb 14, 2018 · Attic temperatures are about 120°F. And conditioned air inside a duct is about 58°F. So the delta-Ts would be: I don’t know about you, but when I look at that, it seems we …

Oct 22, 2014 · An energy-recovery ventilator (right) and a duct distribution box (center) in a spray foam insulated home. Contractors who install spray polyurethane foam insulation put …

Apr 17, 2015 · If an attic is insulated with a thin layer of vermiculite — a layer that provides less than the minimum R-value required by code — it’s hard to come up with a good way to …

Dec 28, 2022 · Typical airtight and vapor-limiting electrical box Working as a residential electrician back in the late 1990s, I learned about a new electrical box that we were asked to use on all …

Sep 20, 2013 · If you want to improve the energy performance of an older house, one of the first steps is to plug your attic air leaks. Although many GBA articles address aspects of attic air …

Oct 10, 2012 · Pull-down attic stairs are super-sized attic hatches that just beg homeowners to store more stuff in their attic. Besides the air-leakage and insulation problems stemming from …

Feb 6, 2024 · I’m working on a future article for Green Building Advisor whose working title is “Problems with Attic Trusses.” While researching for the piece, I found myself reviewing the …

Sep 21, 2018 · But owners of older homes — homes built before thick ceiling insulation was code-mandated — often discover that the attic lacks enough room near the eaves to accommodate …