Green Homes News

Air Sealing Between Zip Sheathing and Concrete Foundation – How To Convince An ‘Experienced’ Builder

Green Homes 2 - Sat, 2022-05-07 19:05
I may be in the same situation as many customers who have had a house built for them, and have enough building science information, and lack of real world experience,…
Categories: Green Homes

Two of my three Fujitsu Halcyon units have leaks in the indoor units

Green Homes 2 - Sat, 2022-05-07 17:54
Hey all,Has anyone had any quality issues with Fujitsu units?  Trying to determine if this is a known issue, just really bad luck, or something else going on specific to…
Categories: Green Homes

Rockwool Lambda values vs density – compress, and how much to increase R/cm?

Green Homes 2 - Sat, 2022-05-07 16:00
Hi all, I'm building a tiny house from only second hand building materials. This is an amazing challenge that has been keeping me busy for the past couple months.I'm now starting…
Categories: Green Homes

Can Tyvec drain wrap be used over Zip taped system?

Green Homes 2 - Sat, 2022-05-07 07:29
It’s a little too late for changes as the house is finished….. but I am wondering if it’s going to cause problems if the house has:1.Hardy cladding2. Tyvec drain wrap…
Categories: Green Homes

Roofing co. insists on attic fan & cut-in soffit vents

Green Homes 2 - Sat, 2022-05-07 03:11
This is my second post here on my attic insulation project. We decided to reroof as well and it's getting interesting but not in a fun way. Just to give…
Categories: Green Homes

Converting non-structural end truss to structural?

Green Homes 2 - Fri, 2022-05-06 20:14
So, I goofed and failed to order my end trusses with structural webbing for the shear wall...they currently only have 24" OC webbing for attaching sheathing and are not structural…
Categories: Green Homes

New House Ventilation/Filtration

Green Homes 2 - Fri, 2022-05-06 17:47
Building a home in California, climate zone 6, with hydronic floor heat.  We're at about 7000 ft. so it's pretty dry.  We don't plan on AC.  I'd like to install…
Categories: Green Homes

Impact of Microclimates on Sizing a Heat Pump System

Green Homes 2 - Fri, 2022-05-06 13:39
Hi, inexpert homeowner here.  We are replacing oil burner with an ASHP system.  Climate zone 6A in NY.  The winter outdoor temps at our house consistently are 5F more than…
Categories: Green Homes

Unvented roof detail with metal roofing and purlins over rigid foam

Green Homes 2 - Fri, 2022-05-06 13:04
Hello! First post here, so please bear with me as I figure out the best way to format my text and paragraphs here.I'm attempting to sort out some details of…
Categories: Green Homes

Trane XV18: Compressor not turning on in “charging mode-cooling” but otherwise works

Green Homes 2 - Fri, 2022-05-06 11:39
I know it's a long shot since this isn't specifically an HVAC forum (I already posted this message on and didn't get much feedback), but I figured I'd try…
Categories: Green Homes

HDS Climate Justice and Religious Literacy Live Workshop

Green Homes - Fri, 2022-05-06 11:00
Location: Online

Join Religion and Public Life at HDS for a Climate Justice and Religious Literacy Live Workshop, featuring RPL Climate Justice Fellow Teresa Cavazos Cohn, whose work as a science communicator focuses on community storytelling work, Indigenous waters, and human dimensions of wildfire.... Read more about HDS Climate Justice and Religious Literacy Live Workshop

Categories: Green Homes

Improving Climate Models with Hybrid AI Approaches

Green Homes - Fri, 2022-05-06 11:00
Location: Science and Engineering Complex LL2.221

As part of the ACS Distinguished Lecturer Series, Tapio Schneider, Theodore Y. Wu Professor of Enviornmental Science and Engineering, California Institute of Technology, will present "Improving Climate Models with Hybrid AI Approaches."... Read more about Improving Climate Models with Hybrid AI Approaches

Categories: Green Homes

Hybrid Insulation Rockwool and Sika Rmax In Unvented Roof With 2 Vapor Barriers

Green Homes 2 - Fri, 2022-05-06 10:07
Hi there, I’m in Eastern Washington getting my roof finished. Feeling overwhelmed with all the different design and material options. Initially I thought of Sika Rmax cut and cobble but…
Categories: Green Homes

Electric heat retrofit for ductless 1950s house in cold climate

Green Homes 2 - Fri, 2022-05-06 08:59
Hi, I'm wondering if anyone can help provide some direction here. We have a 1,450 square ft, two story home in Madison, WI built in 1953, which has no cooling…
Categories: Green Homes

Ventilation and Cooling for An Airtight Home With Radiant Heat

Green Homes 2 - Fri, 2022-05-06 07:23
I am trying to determine the best ventilation strategy for an airtight home in Climate Zone 5A that will be using radiant floor heat as its primary heating system. The…
Categories: Green Homes

The Potential of Phase Change Materials

Green Homes 2 - Fri, 2022-05-06 02:00
Phase change materials got off to a slow commercial start but have emerged in a revised form to promise reduced energy use
Categories: Green Homes

Flash and Batt with XPS on interior side of garage wall.

Green Homes 2 - Thu, 2022-05-05 22:28
I'm replacing the mouse-compromised insulation in my 2 car under garage/workshop.  I plan to get R19 garage doors.  One wall is all concrete, the opposite wall is 3'6" of concrete…
Categories: Green Homes

Stem Wall Florida – Damproof/Waterproof

Green Homes 2 - Thu, 2022-05-05 18:59
Hi all, the general building around here is typically slab on grade.  The other option is they pour a concrete footer in the dirt with a block wall, no waterproofing,…
Categories: Green Homes

Will rigid insulation above fiberglass prevent condensation in a vented crawl space?

Green Homes 2 - Thu, 2022-05-05 18:55
Hello Fellow Building Aficionados!The building I am working on has a vented crawl space with a dirt floor (same grade as exterior) and lives in the hot humid land of…
Categories: Green Homes

Closed vs open cell for cabin with furred walls

Green Homes 2 - Thu, 2022-05-05 15:23
I've read the "installing closed-cell spray foam between studs is a waste" article here outlining the meager difference in r-value gain by using closed foam due it not coming to…
Categories: Green Homes


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