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6 Answers

How tight does a house need to be at ACH 50, before an ERV or HRV is recommended?

In Energy efficiency and durability | Asked By Allen Brown | Apr 12 14
10 Answers

I have a humidistat sitting in my house the last few years, and have taken notice of the RH%.

I am concerned that an HRV will dry out my house too much. Location is Toronto which has cold winters (down to -18 celcius) and summers up to 30 and 35 celcius humid

With a forced air system with a humidifier installed, we go down to about 16% humidity in the winter on the coldest days. typical is around 20%-24% . In the summer we are at about 50-54% ish.

with these numbers would an HRV make it too dry, or would the numbers typically be affected only slightly?

In Mechanicals | Asked By cory b | Apr 13 14
3 Answers

My builder is going to use 5 inches of EPS rather than 4 inches of XPS on the exterior walls. His reasoning is the same insulation value for a little less money ....any pro's or con's either way?
Thanks,
Bob

In Energy efficiency and durability | Asked By bob holodinsky | Apr 15 14
2 Answers

Hey everybody,
I find Martin's article A New Way to Duct HRVs pretty fascinating. It seems pretty sensible for a well sealed/insulated home, however the postscript from Dr. Straube says that 10cfm of conditioned air wouldn't help with regulating the temperature in a closed off bedroom. I guess that makes sense at that rate.

In General questions | Asked By Michael McNulty | Apr 14 14
2 Answers

This will be located in SW Colorado climate zone 6B (ICC zone 5B). Long axis due east-west with a 45 deg bend on the west 1/3. Attached is a pdf of a typical cross section of the proposed design. I will have some specific questions forethcoming but this is partly a test to see how the pdf looks posted.

In Plans Review | Asked By Chuck Jensen | Apr 12 14
1 Answer

I have an 8 year old structural-insulated-panel house. It is tight, has good siting, big roof overhangs and performs well with passive heating and concrete floor hydronics. It has no air conditioning. In my climate we can get a week of 110 to 115 degree highs and 70 degree lows when the small whole house fan makes it difficult to sleep due to noise.

In Green products and materials | Asked By Joel Levine | Apr 14 14
1 Answer

I have a cabin that has a 1/2 inch layer of Homasote as the ceiling in the main living area. We just added heat and air conditioning and I wanted to blow in Insulation (cellulose) in the 5 1/2 inches above the homasote. Will this cause excessive moisture to accumulate and will the Homasote bulge from the extra weight and humidity. I found a product at Lowes that is 3 1/2 fiberglass insulation covered in plastic on both sides that I might be able to get down there. Would this be a better idea? The cabin has a metal roof with no eave vents or ridge vents. Thanks

In Energy efficiency and durability | Asked By Rob Beaumont | Apr 14 14
13 Answers

Hi! I've been following a variety of discussions about ventend/unvented assemblies in cathedral ceilings, in low slope roofs, in different climates, on FHB, JLC for close to two years. I’ve read Martin, I’ve read Lstiburek, I’ve talked to the architects (hopeless) and structural engineers. I thought I had this nailed down, and now the builder (who also happens to be a SE - long story), comes at me with a new idea.

So I’m finally going to “vent” my worries and seek some advice specific to our situation.

In Green building techniques | Asked By Michelle Paninopoulos | Apr 7 14
6 Answers

This rambling old farmhouse in rural Maine has an attached 3-bay garage that connects to the kitchen. The garage has a two-bedroom, seasonal or guest apartment overhead, so it is a large structure, with 2X4 studs.

In Green building techniques | Asked By Roger Woodbury | Apr 12 14
1 Answer

Does anyone know of any links to energy efficient duplex house plans? Preferably something compatible with passive house or similar low-energy paradigm... thanks in advance!
p.s. Martin posted a link to a similar question of mine but they were all SFD plans..

In General questions | Asked By erik olofsson | Apr 14 14
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