Green Homes News

Anyone regret or love having only heat pump(s) for zero F winters?

Green Homes 2 - Tue, 2025-09-23 17:48
Big question for us: do we go all-in on 100% heat pumps?  Or do we go with hybrid heat pumps?  The energy engineer is all-in on heat pumps and thinks…
Categories: Green Homes

Intello Needed w/ Dense Pack Cellulose?

Green Homes 2 - Tue, 2025-09-23 13:44
Dear GBA Community, We are in the midst of building a moderate-to-high-performance home in central Vermont.  Following extensive discussions with our architect, we had settled on the following wall assembly (from…
Categories: Green Homes

overhangs for thick foam roof

Green Homes 2 - Tue, 2025-09-23 12:47
Does GBA have an article illustrating various ways to detail roof overhangs for an unvented roof where 100% of the insulation is rigid foam on top of the roof sheathing?…
Categories: Green Homes

Designing heat pump system transitioning from natural gas furnace

Green Homes 2 - Tue, 2025-09-23 10:21
1550 square foot duplex home built in 1900 in Western Massachusetts3 floors: first floor is one unit, second and third floor is a second unitCurrently heated by a 90k btu…
Categories: Green Homes

Osb as vapour retarder

Green Homes 2 - Tue, 2025-09-23 06:21
My garage workshop will have interior osb sheathing. The building inspector says I don't have to have any vapour barrier because it's a garage. It seems that the argument against…
Categories: Green Homes

Rainscreen & corrugated metal siding

Green Homes 2 - Tue, 2025-09-23 02:07
We are having a coravent rain screen installed with vertically hinged corrugated metal siding over it. With this siding material, it will be impossible to make sure every nail securing…
Categories: Green Homes

PFAS (Forever Chemicals): The Building Industries Next Asbestos?

Green Homes 2 - Tue, 2025-09-23 02:00
What the building industry can do with forever chemicals
Categories: Green Homes

Choosing a Water Heater

Green Homes 2 - Mon, 2025-09-22 21:23
I am in the process of finalizing design and beginning build of a 1500 square ft slab on grade ranch in climate zone 5 and I am trying to decide…
Categories: Green Homes

Minimum crawl space height (Canada NBC, BC)

Green Homes 2 - Mon, 2025-09-22 20:54
My renovation - green I promise - has encountered some difficulties, and I need either a suspended slab or floor joists just below grade.  (The ground cannot support a slab,…
Categories: Green Homes

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