Q&A: A Forum for Green Building Experts and Beginners

[Click map to enlarge]

Please register for a free account or sign in to ask and answer green building questions.

The usual rules of courtesy apply:
1. Be nice.
2. If you can't be nice, be polite.
3. If you can't be nice or polite — well, please be brief.

To attach a photo or illustration:
Under the box labeled "More explanation," look for the words "File attachments."
Click that, and you should be able to attach a photo.

Thanks for joining the conversation!

9 Answers

Hello,
The attached file shows a wall design concept for a new house build near Minneapolis, Mn. I'm trying to design a wall that is both easy to build and has good performance.

Asked By Karl Overn | Apr 20 14
0 Answers

Martin will be speaking on "Affordable Green Homes for Cold Climates" in Montreal, Quebec, at 7:00 p.m. on Friday April 25, 2014. The event will be held in Room 3110 at the School of Architecture at the University of Montreal. He will be speaking in French.

For more information on the event, visit the Maison Saine website.

Asked By Martin Holladay | Apr 21 14
1 Answer

Hi

Does anyone have a recommendation for crawlspace exhaust fans?

Would an appropriately sized Panasonic be the simplest option?

Asked By Jill Neubauer Architects | Apr 21 14
1 Answer

Walkout basement in zone 4C (west coast) 2x6 framed exterior wall with r20 fiberglass batt insulation. To eliminate the 'step' (many houses have a finished shelf) of concrete foundation which comes up 2', client wants walls framed from floor to underside joist inside foundation to avoid the shelf, creating a space between the framed exterior wall and the new interior wall. Should the vapour barrier (6 mil plastic be relocated to inside of newly framed wall, and if so, should new wall be insulated? the full cavity be insulated? thanks, dan

Asked By dan nugent | Apr 21 14
5 Answers

All,

I'm a licensed GC designing an addition to my personal residence which we built in the late 80s. The original house was built with 2x6 studs and might very well have been the first house built in NC with a sealed crawl space. (I gave my building inspector a copy of a sealed crawl space article by the TVA, and he OK'd the sealed crawl space.)

I would greatly appreciate some input on a couple aspects of the design.

Thanks,

Bill

Project synopsis:

Asked By Bill Daugherty | Apr 20 14
7 Answers

I am renovating my house, installing solar panels and getting rid of my gas forced hot air system and replacing with mini-splits (very small home < 1000 sq feet)
I would like to install an energy efficient heating system in the bathroom (about 6' x 8') as I'm not sure the heat will effectively get there, plus I like to have a separate zone for the bath for the usual reasons. i had thought about electric radiant heat in the floor but have heard that can be quite an energy drain.
Do people have a suggestion for a very small heating unit for this purpose?
Thanks!
Maggie

Asked By maggie wilbur | Apr 19 14
2 Answers

is there a ballpark rule of thumb that spans different regions for the mean monthly sunshine or possible percent sunshine that is conducive to a favourable result in PHPP?

Asked By erik olofsson | Apr 20 14
4 Answers

I have a recurring question / situation that comes up in my east central MN location (6b-7a border). There are many 1970's homes undergoing remodeling and looking to add insulation for improved comfort and energy effciency. Miost common construction is drywall, kraft faced R13, 2x4 walls, 3/4" Bildrite (asphalt fiberboard sheathing).

Asked By Troy Tvedt | Apr 17 14
43 Answers

In another thread, my choice for HVAC was appropriately questioned. The system seems inordinately complex, costly, and convoluted. At least, on the surface. But digging deeper, the reasoning behind the design becomes clear. But, does that make it right? Is this the best HVAC design, or is it redundant and wasteful?

Here are the pertinents:
• Climate Zone 6
• 2700 sq. ft. finished space in story-and-a-half (bungalow style) house
• 2000 sq. ft. unfinished basement (future completion for aging parents)
• 4 Bdrm, 3 ½ bath house
• Tight, highly insulated home

Asked By Kent Jeffery | Apr 16 14
1 Answer

Are the ductless minis that utilize a cassette unit vs a wall unit, less efficient?
Are there any drawbacks to a cassette unit over a wall mounted unit?
Lastly, can a cassette unit be mounted on a wall or is that not a good idea?

Asked By Peter L | Apr 19 14
Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!