Green Homes News

Framing interior walls for easiest drywall installation

Green Homes 2 - 3 hours 34 min ago
We have the exterior shell built for our new home and starting to construct wall and ceiling service cavities and then interior walls.  I'm trying to understand how best to…
Categories: Green Homes

Trenchless utility runs for tight, high-performance sites?

Green Homes 2 - 6 hours 14 sec ago
I'm working on a project with a very tight building envelope and a lot of protected trees on site. We need to run several utility lines (water, electrical, and data)…
Categories: Green Homes

Home Battery Systems Part 3: Home Battery Backup System Case Study

Green Homes 2 - 10 hours 10 min ago
A real-world review of a modular home battery system—covering installation, performance, and why the economics don’t always match the marketing.
Categories: Green Homes

Help finding source for Graphite EPS

Green Homes 2 - Sun, 2026-05-17 13:00
Looking for GPS 40psiAnyone have a source or “part” number for Graphite EPS board? We’re located in MidAtlantic area outside of Philadelphia. Ready to go with a floating plywood slab…
Categories: Green Homes

Questioning the wisdom of ERV supply air into bedrooms- cooling climate

Green Homes 2 - Sun, 2026-05-17 11:19
I recently switched from erv supplying the bedrooms to erv exhausting the bedrooms and I'm seeing some major advantages and wondering why bedroom return is not the standard practice. In my…
Categories: Green Homes

Insulating a dormer ceiling that is partially vented (non-cathedral) and partially unvented cathedral

Green Homes 2 - Sun, 2026-05-17 11:15
During a bathroom remodel, we had a bright idea to vault a section of the ceiling over the window and future bathtub location. This has complicated the insulation plan as…
Categories: Green Homes

panasonic erv

Green Homes 2 - Sun, 2026-05-17 11:00
Hello, 2 part question today, we've completed a total rebuild over a year ago including duct, erv, heat pump, and gas furnace in a century home.Still chasing Rh% issues across the…
Categories: Green Homes

FPSF – subslab insulation

Green Homes 2 - Sun, 2026-05-17 07:42
Hi folks,GBA lurker here making a first-time post. Parts of this topic have been covered but I'm hoping to consolidate notes and get some additional input.I'm in Portland, ME (AFI…
Categories: Green Homes

Risk of rockwool fibers migrating into indoor air?

Green Homes 2 - Sun, 2026-05-17 03:56
After completing electrical work, I am planning to fill my wall service cavity (about 2 inches in depth) with rockwool batt insulation to give some extra r-value. My finish wall…
Categories: Green Homes

Reaching R40 wall with Common Wall? Separate Layers?

Green Homes 2 - Sat, 2026-05-16 14:28
I have a 2x6 framed house with taped CDX plywood and Tyvek on the outside. I'd like to reach an r40 wall insulation, but I'd also like to skip exterior…
Categories: Green Homes

Passive home HVAC design

Green Homes 2 - Sat, 2026-05-16 13:35
I have a mechanical engineer who says he's done Passive home design. My new home design is 6,000 s.f. in climate zone 4A with a SIP house exterior walls and…
Categories: Green Homes

Help me understand window detail in Dr. Joe’s “Deep-Dish Retrofits”, please!

Green Homes 2 - Sat, 2026-05-16 11:26
Thanks in advance for your time and thoughts!I'm considering applying the methods outlined in Dr. Joe's 2014 article:https://buildingscience.com/documents/insights/bsi079-deep-dish-retrofitsBut I'm having a hard time with the detail at the top of…
Categories: Green Homes

Framing & Sealing a Backyard Sauna on a Concrete Pad — Philadelphia

Green Homes 2 - Sat, 2026-05-16 08:17
I'm preparing to build a freestanding backyard sauna on a freshly poured 4" concrete pad (cured for 10 days) and have a few questions before I start framing.The pad measures…
Categories: Green Homes

Over-roof framing details

Green Homes 2 - Fri, 2026-05-15 09:37
I have a Colonial style house built in 1785, located in Connecticut (climate zone 5A). There is a 12'x20' bedroom addition on the north side that needs a new roof.…
Categories: Green Homes

Are Smart Vapor Retarders Cheap Insurance?

Green Homes 2 - Fri, 2026-05-15 02:00
A year of side-by-side field monitoring in a Climate Zone 5 double-stud wall
Categories: Green Homes

Foam insulation and drywall on interior ceilings

Green Homes 2 - Thu, 2026-05-14 21:14
I’m getting ready to cover my popcorn ceilings on my house that was recently purchased. My plan is to put 1 or 1.5” inch of poly iso foam installation on…
Categories: Green Homes

Thick wall door sill pan

Green Homes 2 - Thu, 2026-05-14 13:33
What are people typically doing for a door sill pan that's wider than 7.25"? That seems to be the limit for pre-made sill pans. Custom bent metal with site made…
Categories: Green Homes

Contega Sealant & Sill Seal… can this step be done in the rain?

Green Homes 2 - Thu, 2026-05-14 08:30
We are planning to use the contega w/ sill seal method as pictured below for our garage build. The one thing I found when looking up details is that you…
Categories: Green Homes

Radiant heat or baseboards?

Green Homes 2 - Thu, 2026-05-14 02:45
Can anyone recommend a free heat load calculator? I’m renovating a 1950s ranch home for my parents with heavy insulation upgrades, including double exterior walls with mineral wool and exterior…
Categories: Green Homes

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