Community: PassivHaus

PassivHaus is a standard of construction that yields extremely tight envelopes and low energy use.

The PassivHaus Institute is in Germany, but we have a branch here in North America as well, Passive House Institute US

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1 Answer

A mix of building science, advanced products & FREE BEER!

Announcing PHnw 5!

The Northwest best mixture of building science presentations mixed with advanced product vendors in ventilation, windows, air barriers, water restive barriers, co2 heat pumps and all of the latest gadgetry to produce any type of low energy building enclosure: PH, NZE, LBC PGH.

Thursday March 29th: Advanced Classes (limited seating) (class info coming soon)

Asked By albert rooks | Feb 15 14
1 Answer

Airtightness and mechanical ventilation

What is the limit point, in terms of airtightness, that a residential retrofit needs mechanical ventilation (with heat recovery)?

Asked By ilais igoumenidis | Feb 2 14
4 Answers

PHPP software level of difficulty

There are a couple consultants in my area with whom I plan to speak and I was wondering if part of the consultant training includes learning this program and how good/proficient is one out of the gate? I would like to have calculations done for my 'near' passive house and need to know how experienced someone should be with this software? Is it crazy difficult? I've seen many questions about the software and its challenges and one consultant said it's 30ish tabs on an Excel document.

Asked By Lisa O'Donnell | Jan 5 14
9 Answers

Single Story Passive Homes?

Is it possible to make a viable single story passive home? Most are two-story designs since you can fit more glazing on the south elevation with two floors.

The other question I have is can one find any "public domain" single story passive house designs to those who want a PH but can't afford to hire an architect to design one?

Asked By Peter L | Nov 23 13
3 Answers

How did you connect the heat pump to the ventilation system?

I am building my own home in central Maine using a double studded wall with 8" of Thermax between the studs. My heating contractor says I can't connect the heat pump to the ventilation system.

- art

Asked By Arthur Taylor | Nov 24 13
5 Answers

I need some help (advice on windows)

I'm in the process of building a new house. I am zone 6, I have the house orientated with lots of glazing on the south side.Trying to gain as much heat from the sun as possible. But i don't want to get cooked in the summer. I have external shading designed on that side. I have a R-20 under my slab, R-30 on my foundation walls, R-40 walls, and a R-60 cap. I am shooting for a .6 ACH at 50 pascals or less.

Asked By Kirk Nygren | Nov 21 13
1 Answer

Passive Solar & Thermal Mass

On the southern facing rooms having an exposed concrete slab works better for passive solar than a carpet covered floor during winter. Can one have too much exposed interior concrete or in other words, is too much interior thermal mass a bad thing?

During summer, is it beneficial to put down a throw rug of some sort to keep the sunlight from hitting the concrete floor and warming it? (Of course besides the exterior overhangs and window shades)

Asked By Peter L | Nov 2 13
2 Answers

High-solar-gain windows only on the south side?


zone 4/5 border. southern exposure faces ocean.

do we need high solar gain (.47 SHGC - ALMOST qualifies for Canada zone C, even) in all windows or just the south facing ones? Low E 180 glass...



Asked By pat rowland | Oct 30 13
25 Answers

PassivHaus backyard workshop

We're looking to build two sheds in our backyard. One is for storage of lawn-mowers etc and doesn't need to be insulated. The 2nd will be a workshop in which we will probably spend a reasonable amount of time. We're keen to do this as a sustainable showpiece highlighting various aspects of sustainability. We have thought of doing it as a PassivHaus project. As far as I know there are no complete, stand-alone PassivHaus buildings in Australia so this might be a useful demonstration site. A few things come to mind that perhaps some GBA folks could comment on.

Asked By David Coote | Nov 14 12
5 Answers

Wood frame wall details

welcome everybody

My question is, how good it will be wall like this:

from inside

1/ drywall
2/ service space for wire (like Swedish houses) -wood frame 2x2 (fill or not with insulation)
3/ vapor barrier (plastic)
4/ 2x6 frame with mineral wool -
5/ OSB 1/2"
6/ 6 -8" mineral wool
7/ thin coat silicate stucco

I don't have official data but winter is about 4-5 months with some -5°C to -10°C [23.0°F to 14°F] mostly, but can be -20°C [-4.0°F] for week or two.

Asked By peter abramowicz | Oct 4 13
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