Green Homes News

Hello Hoping to reduce labor and simplify floor insulation. Considering: Wood floor over rubberized underlayment on subfloor sheathing,2 inches high density rigid foam on top of 2x10 joists filled with 9.5rockwool. Bottom…

Just curious if there are any first hand accounts of how unbalanced an HRV/ ERV can be made to run to create positive pressure? My owner built home is coming along…

I have a conduit running across multiple stud cavities in an exterior facing wall. The conduit runs from a cantilevered fireplace bump out to the adjacent wall.I went to fish…

We have an engineered white oak floor that we are hoping to install soon. The company recommends a minimum of 35% humidity for their product, however in winter, our home…

Hi all,I’m looking for feedback on an attic air-sealing and insulation plan. I’ve been digging through GBA articles and want to make sure I’m not creating a moisture trap or…

Now that I have made decisions on the insulation and housing envelope, I'm trying to get some ideas for a budget on the HVAC system. I've called five companies in…

Hello Everyone,First let me say I have really enjoyed the content here and the Q&A's.I realize a good amount of my wall assembly considerations have been covered but I wanted…

The IECC and IRC offer multiple paths for crawl spaces—but it's best if you understand the building science behind them.

I'm framing an addition where the largest floor span is about 8 feet. According to the span tables, 2x8 at 24" on center is totally fine for this. But I've…

Hello, I started to air seal and insulated my attic and have a concern with one of my details. The ceiling joists rest on exterior wall, then another double 2x4…

A cautionary tale for anyone who thinks, “How bad could an ERV install really be?”

I'm trying to decide what type of insulation i should use in a cathedral ceiling - new build - and if it needs to be vented.I have a dining room…

In the early stages of finishing my basement. We will be in this home for a long time, potentially forever so I am willing to put in the work to…

I am building a timber frame roof system with a 4.5/12 pitch. Roof decking is 2x6 T&G. My current plan is to use 6" of Rockwool Comfortboard 80 above roof…

The IRC allows unvented roofs—but only under specific conditions. Here’s how to navigate the requirements and choose a compliant approach.

Hi guys. I recently bought a Victorian style home that was built in 2004. What baffles me is how the trim on the outside of the home is already deteriorated…

Hi all. New construction ADU. Climate zone 4C. Unvented, low slope roof, 2x8 ceiling joists, 5/8 plywood sheathing, Prosoco fluid applied full products system, 4 inches of  eps exterior insulation…

There is a post in the Q&A I think raises an important question I don't know than answer to.  https://www.greenbuildingadvisor.com/question/interior-insulation-of-unventilated-roof If the roof is not vented, but there is an…

Hello, I have an old cellar converted to a basement. I’m sure there is nothing modern about its assembly - merely concrete poured over the dirt. It has a sump…

A woman-led natural building project shows how craft, community, and sustainability can shape housing at Dancing Rabbit Ecovillage