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2 Answers

How do you introduce clean air into the house?

Nice thread on insulation types and issues. But once the house is air tight how do you get good clean air inside? I admit to being nervous about foam; if something really negative is found, removing the stuff might cost half the value of the house. All these materials are deemed to be "mold resistant" but what we do in our house creates water vapor and if not allowed to escape would provide the support for mold.

In General questions | Asked By TrueGrits101 | Nov 19 17
10 Answers

Ranch vs 2-Story Home

Generally speaking, if one is looking to build a 1,600 sqft home, which provides the better energy efficiency and less expensive route?

Having 2 levels of 800 sqft each seems like it would be better from an energy standpoint since there is less roof area and everything is compacted in a smaller pad. Cost wise there is less roof area to frame, insulate and install a roof on with a 2-story. There is probably some cost savings in flatwork and foundation with a 2-story since the footprint is smaller.

In Green building techniques | Asked By Peter L | Nov 16 17
12 Answers

Remodel - Insulating a permanent wood foundation (PWF)

Background
We recently purchased a log home built on top of a Permanent Wood Foundation (PWF). It's a ranch style (26'x47') single story. Built in 1980. We have completely gutted the basement. We are down to the 2x6 stud walls 1-foot on center of the PWF. Previously the house was heated via a wood burning furnace and electric baseboard heat, which have both been removed. We had geo-thermal installed utilizing the duct-work that was in place for the wood burning furnace. It's a ground source heat pump made by Water Furnace (5 Series).

In Energy efficiency and durability | Asked By Jeepasaurus | Oct 30 17
3 Answers

Lunos HRV system in cold climate?

We are building a 1,350 square foot single story passive solar home. Slab on grade, very well insulated, open concept living area, 2 bathrooms, 3 bedrooms. Our home is located in northwestern Ontario, Canada, with temperatures dipping to -30 degrees Celsius in winter. The winters are dry. Wondering if anyone has experience with the Lunos HRV system in a cold climate? Would there be issues with the heat exchange during cold days/nights? What about extreme differences in inside and outside humidity?

In Mechanicals | Asked By Vera H. | Jul 5 17
5 Answers

Radon vent

Can a Radon vent be tied, legally, into a plumbing vent or must it remain separate through the roof?

In Building Code Questions | Asked By Jerry Liebler | Nov 17 17
18 Answers

Residential frost-protected shallow foundation in central Mass.

We are planning to provide a monolithic pour frost-protected shallow foundation (FPSF) for a single story 1300 sq ft 2 bedroom home in central MA. Air Freezing Index is 2000. I have read through many different case studies, research papers, codes, etc and there is a bit of conflicting and locale-specific info so I am looking to see whether I understand what is required here. I am a newbie owner-builder. Any constructive criticism would be appreciated, but I don't want to foment any religious wars.

In Building Code Questions | Asked By Kenneth Gartner | Sep 2 16
2 Answers

GBA Construction Details criticism & question

First, I thoroughly appreciate the effort to organize and share a large volume of quality construction details on GBA. Excellent information.
However, I'm disappointed that the .dwg versions of details are incredibly time consuming to work with for the following reasons:

1. Details and objects are completely exploded which makes them very inefficient to work with and revise. Leader arrows are not even singular entities and are exploded into 4 separate objects. Hatches are often dozens of exploded objects which is painful to select in order to edit.

In General questions | Asked By Spencer Decker | Nov 15 17
5 Answers

Please Help!!! Dimple membrane a necessity?

In General questions | Asked By Rasheed Warith | Nov 14 17
10 Answers

Question on direct vent fireplaces

I am gut renovating and expanding a circa 1920 cottage. I am trying to get as close to net zero as I can. I am an architect fairly well-versed in the principles and techniques of net-zero, DER and Passivhaus my firm having designed and built two Passivhaus and 13 net zero homes, all of which have had their performance measured and verified. The point of this bragg-y credentializing is to head off the inevitable finger wagging that usually comes upon mention of the very idea of including a fireplace in a home that aspires to net zero. I get it. Not a good idea.

In Green products and materials | Asked By user-6954517 | Nov 18 17
5 Answers

Possible to use Vented attic in conjunction with Open cell spray foam?

Hello there,
I am a General Contractor in Miami, FL (Hot and humid weather!) and I may get screamed at for asking this question, but is it possible to use continuous ventilation at the soffits (vented attic) in conjunction with Open cell spray foam (sprayed to the underside of the roof sheathing)?

In Green products and materials | Asked By 5221lefty | Nov 15 17
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