Green Homes News

Fly ash substitutes for managing Akali-Silica Reactions: natural pozzolan and metakaolin

Green Homes 2 - 4 hours 35 min ago
I came across this article after reading about some issues with fly ash (it is harder to find with coal plants shutting down, and it is probably not good for…
Categories: Green Homes

Sill plate over foam board (retrofit)

Green Homes 2 - 10 hours 25 min ago
I’m retrofitting an old building. It has solid brick walls (no insulation, no vapor barrier) and a slab on grade floor (no insulation, no vapor barrier). I want to insulate…
Categories: Green Homes

Screw for T and G deck ceiling

Green Homes 2 - 11 hours 43 min ago
I have a second floor addition suspended over a deck. The ceiling has been spray foamed between the rafters so now I want to cover with T and G board.…
Categories: Green Homes

PGH book

Green Homes 2 - Fri, 2026-05-08 17:23
Out of stock everywhere.  What's the scoop on availability?
Categories: Green Homes

Insulating and air sealing a 1920s attic with dropped ceiling and lower addition

Green Homes 2 - Fri, 2026-05-08 08:43
Hello all, Climate zone 6. Peeling back the layers on a balloon framed 1920s kitchen addition. Attic directly above and newer extension. Diagram in pictures. Looking for opinions for insulating and air…
Categories: Green Homes

Understanding the Energy Code: Does the IECC Require Testing of All Mechanical Ventilation Systems?

Green Homes 2 - Fri, 2026-05-08 02:00
A closer look at IECC Section R403.6.3 reveals that both whole-house and local exhaust ventilation systems must be tested and verified—despite ongoing confusion in the field.
Categories: Green Homes

Advice on shed/studio roof ventilation

Green Homes 2 - Thu, 2026-05-07 23:27
Hi!I’m doing my first shed build with a family friend. We are on a tight time and budget crunch but I don’t want to create any long term issues being…
Categories: Green Homes

Tyvek or taped rigid foam as WRB

Green Homes 2 - Thu, 2026-05-07 19:15
what is the general consensus ? Do I need tyvek /typar over rigid foam to be my WRB or a carefully taped rigid foam continuous insulation will suffice ?
Categories: Green Homes

HELP! Contractor Error Causes Roof Leak in Assembly, Now What?

Green Homes 2 - Thu, 2026-05-07 14:35
Need some help to determine what a real fix looks like.  Contractor (for whatever reason) decided to rivet the metal roofing panels from the main structure to the flashing transition…
Categories: Green Homes

500-800 sf accessible house that is built to be moveable

Green Homes 2 - Thu, 2026-05-07 09:24
I have been diagnosed with a rare and aggressive sarcoma, which has dramatically altered my priorities for the next 5(?) years. I also have ME/CFS, which I suspect is being…
Categories: Green Homes

6 Ways Your Oversized HVAC System Makes Things Worse

Green Homes 2 - Thu, 2026-05-07 02:00
Oversized heating and cooling systems are common—but they come with real downsides, from poor humidity control to noisy operation and higher costs
Categories: Green Homes

Wallpaper…. vapor open…

Green Homes 2 - Wed, 2026-05-06 18:35
So, as we dive deeper into high performance homes, the more you learn, the more you realize you dont know..Building a home now, goal is passive house, air control layer is…
Categories: Green Homes

PV solar calculation

Green Homes 2 - Wed, 2026-05-06 14:26
I'm evaluating whether to put solar panels on my new workshop. I'd previously been eligible for an interest free loan, which made the proposition seem like a no-brainer. As it…
Categories: Green Homes

Makeup Air for Venthood?

Green Homes 2 - Wed, 2026-05-06 09:04
We have a gas range and because we do a lot of home cooking, purchased a range hood that would help make sure any fumes are taken out while cooking.…
Categories: Green Homes

Salvage First, Design Later: Building a High-Performance Home from Reclaimed Materials

Green Homes 2 - Wed, 2026-05-06 02:00
The first in a multi-part series following a Kansas home built from salvaged materials, exploring how reuse, building science, and performance goals come together in practice.
Categories: Green Homes

Cold weather concrete

Green Homes 2 - Tue, 2026-05-05 15:10
It's been in the 50-60s, and my footers just got poured today. It's now going to get to 20 tonight, then warm back up and have no further temps below…
Categories: Green Homes

Insulation upgrade in 1920 home (4A) – unvented conditioned attic

Green Homes 2 - Tue, 2026-05-05 11:07
I am a (relatively) new homeowner in a 1920 single-family house in climate zone 4A. The AC unit is in the attic and was installed by the previous homeowner. The…
Categories: Green Homes

Federal Home Efficiency and Electrification Rebate Programs Still Have a Fighting Chance

Green Homes 2 - Tue, 2026-05-05 02:00
The devil is in the details, which the current Energy Department is decidedly light on
Categories: Green Homes

Encapsulated Spray Foam Attic Code Requirements

Green Homes 2 - Mon, 2026-05-04 13:58
Hi All,New member here.  First a little background on myself.  I have been an HVAC contractor all my life so going on 35+ years now.  I run an honest heating and…
Categories: Green Homes

Looking for an ERV retrofit installer in Central NJ

Green Homes 2 - Mon, 2026-05-04 12:48
I'm looking to install something like an intelli balance in my partially finished basement. Older home built in the 70s.Does anyone have recommendations for installers in the Monmouth County, NJ…
Categories: Green Homes

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