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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20 Answers

LG Split HVAC with dehumidifier

We built a PassivHaus with a Silver rating. We are in the South so it is hot and humid. We have a mini lg split with a dehumidifier and an ERV system on our 2200 sf home. We have been in the home for 4 months now and cannot get the humidity under control. It is currently between 71-80% at any given time. Seems to increase when we turn on the dehumidifier (80%). Our smoke alarms have started to go off when it gets that high. My shoes have molded and the sheetrock tape is bubbling off. The temperature in the house is lovely, but it feels and is wet.

Asked By Rhonda Carpenter | Aug 10 16
5 Answers

Instantaneous gas water heater with small tank to meet PHIUS+ hot water performance requirement

We are well into the construction now, and don't have a lot of flexibility. For example, have 3'' venting pipes in place for what was meant to be Eternal condensing hybrid gas hot water heater with 2 gallon tank. The small tank helped to reach PHIUS+ requirements of not wasting more than 0.6 gallon of water before the water temperature at the furthers fixture reaches 75F. (We also designed very small diameter hot water pipes to help that goal).

Asked By Lucyna de Barbaro | Jul 18 16
1 Answer

Solar Convection or Passive House?

We are interested in building a home that is very energy efficient and we are working with an architect. He had given us preliminary drawings of a convection solar house. Does anyone have any experience with this type of home? Essentially, it has an area on the South side that acts as a heat collector - the sunspace. It is all windows and runs the length of the house but is only 8 feet deep. Then there is a full wall with windows and patio doors leading to the great room. We want tons of light and access to the outdoors.

Asked By Margaret Demko | Mar 31 16
9 Answers

Planning to construct a certified PassivHaus just north of Toronto, Ontario, Canada.

Currently live in a 2 storey ICF house with a full basement that I built 16 years ago. Really believe that ICF is the only way to build. After doing some research, I haven't found any passive houses that have been built with an ICF building envelope. Almost all houses have been built with various wood framing systems combined with cellulose or other insulation products. Is there a problem with an ICF building envelope?

Thanks in advance,

Andy Voura

Asked By Andreas Voura | Mar 17 16
0 Answers

Slab Floor Construction

I was a watching a video today of a slab on grade construction at a new build PH in Ireland. Their buildup was radon barrier, concrete, and then what appeared to be 2 layers of 4" thick polyiso-like sheets. The sheets were to be taped into aerated concrete blocks around the perimeter to maintain the thermal envelope. Seems as if in the US, the insulation layer is usually underneath the concrete. I know in a retro you can put foam on top of concrete, but anyone know why is it not typically done this way in new PH builds here, especially if you don't want a finished concrete basement floor?

Asked By Jonathan Lawrence CZ 4A New Jersey | Feb 1 16
6 Answers

Passive Aggressive House

What are the Pros and Cons of a Passive Aggressive House?

How do you know if your house is Passive Aggressive?

Asked By Hal Sartelle | Jan 24 16
5 Answers

JM Spider Spray Fiberglass Insulation


Asked By Jonathan Lawrence CZ 4A New Jersey | Jan 18 16
9 Answers

Light-weight thermal mass option for passive solar?

Hi, I am trying to design a single 40' long high cube storage container to be converted into a living space. It will be completely off-grid, insulated very well with closed cell insulation. I want to take advantage of as much passive solar heating as I can. The container will have great un-obstructed southern exposure. I want to keep construction weight down as much as I can.

Asked By Cameron | Jan 5 16
9 Answers

Passivhaus Builder certification and BPI Building Analyst certification


I am at the beginning stages of getting my Class A Builder's License in Virginia. Apart from that whole process of getting a contractor's license, I was wondering if getting certified as a Passivhaus Builder or BPI Building Analyst is beneficial not only for expanding my knowledge and creativity, but also from an economic and networking standpoint. Has anyone received new clients or jobs from being listed as Passivhaus or BPI certified? Has anyone gotten hired to a great new job from being certified?

Asked By Jimmy Nguyen | Dec 1 15
6 Answers

Does this setup seem sufficient?

After reading many of the articles and comments here, I've been inspired to try and build Passive House insulation and air tightness.

I'll share what I'm thinking so far with the hope that maybe you can direct me in any way. Not necessarily trying to get Passive House certified, but would like to build airtight anyway.

Region: west mountains of Dunlap, TN


Asked By Edwin Perdomo | Nov 23 15
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