Community: Plans Review

Post images of your construction details, get feedback from the GBAGreenBuildingAdvisor.com community and advisory team.

Q & A Instructions

[Click map to enlarge]

The GBAGreenBuildingAdvisor.com web site has a wealth of articles on a wide variety of construction topics. Before posting your question, you may want to check out the articles on this page: How To Do Everything. You just might discover an article there that provides the information you seek.

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

If you want to post a question, 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!


15 Answers

Planning a new double-stud house — what should I change?

My wife and I are planning a 2,100-square-foot house in Massachusetts. Here's the plan: a south-facing wall with glazing equal to 13% of the 1st floor area. A 5" radiant slab on grade with 4' frost wall on footings insulated with 4" of xps underneath with a stepped foundation top to minimize thermal bridging.

We were planning a 10 1/2" cavity double-stud wall with dense-pack damp-spray cellulose and lots of air sealing. Huber Zip System exterior sheathing with strapping and vertical pine siding sealed on all sides for a rainscreen wall.

Asked By noah kaput | Sep 15 11
1 Answer

Do these calculations seem reasonable?

I created an excel heat loss model for a proposed house design to help me select what steps beyond code compliance will have the most impact. I would appreciate any comments that more experienced people might have on my results. The house is about 2300 square feet above grade in climate zone 5 (about 100 miles from the zone 6 border). The second floor is about 1/3 the size of the first floor. The baseline code compliant model uses the following assumptions:
• 2x6 walls, 16 o.c., cellulose in cavity
• Attic cellulose R = 38
• Basement R = 12
• Windows U = 0.35
• ACF50 = 3

Asked By Reid Baldwin | Jun 16 15
6 Answers

Skip the plywood, go right ot the Comfortboard IS

I live in central Vermont, heating zone 6, hoping to get a little bit of feedback on the wall system I have in mind for a 4 season workshop (barn), with small efficiency apartment on the second floor.

Asked By Blake Olson | May 2 15
1 Answer

New Home - Wall Assembly Review

I'm building my first custom home this summer and could use GBA's collective wisdom to vet the wall assemblies.

Stats:
Zone 5a
Logix Platinum ICF basement (R-28)
2x6 advanced framing, blown cellulose, 7/16" OSB, Tamlyn Drainable WRB, 1.5" Terrafoan EPS, Fiber cement or steel siding.
Conditioned attic with min. R-38 closed cell spray foam
"Innie" window placement

Questions:
Will placing the drainable WRB between the sheeting and EPS cause air flow that will serve to defeat the EPS insulation?
Does this mean I should move to an "Outie" window placement?

Asked By Nethaniel Ealy | Apr 16 15
7 Answers

Rigid foam overcoat method on my own house

Hello,
Been reading this website on and off for the last 7 years or so. I really appreciate the knowledge base here.

It is time to re-roof my own house, Denver, climate zone 5b. I plan on incorporating something similar to the JLC August 2014 article, "Project Overcoat" with a couple of caveats.

Asked By Matthew St Martin | Mar 20 15
14 Answers

Who the heck can draw an advanced framed house...or is it even drawn that way?

So I'm working toward building an affordable house and am not working with an architect (Talked to a friend of mine's firm and the $10,000 price tag is a huge part of my budget so no can do). I've also talked to a couple of draftsmen who don't know anything about advanced framing. Where can I find a semi-affordable draftsman who knows how to draw advanced framed plans?

Asked By Andrew Bennett | Mar 12 15
13 Answers

Please review my floor plan

See attachment for proposed floor plan. My dear, dear wife likes most of it except the location of the pantry/utility room. I've tried to move the flexroom to the area behind the garage (see second attachment), but I end with with a smaller closet and bath in the master. She urged me to ask other people...so people...I am askin'. What's your input on that or anything else you see?

Asked By Andrew Bennett | Mar 14 15
11 Answers

Plans Review with a few questions

We are getting closer to building our new home. The preliminary drawings have been completed (links to plans at the bottom). We aren’t exactly building a green house, but over the last year I’ve read an enormous amount of good information from this website and a few others to help guide me in building a more durable and energy efficient house than what is typically done around here (vented crawlspaces and ducts in a vented attic are pretty standard here).

Asked By Michael Geoghegan | Feb 4 15
3 Answers

Can R-10 XPS foam against concrete and R-15 mineral wool batts between framing be combined in a basement?

I'm in the process of finalizing the plans for my basement. Our current plan is to do R-10 XPS attached to the concrete blocks walls, followed by R-15 mineral wool batts between the studs. I live in central NJ, and the foundation wall is more than 60% above grade.

I'm now concerned about condensation between the mineral wool and foam. Allowing (extremely generously) R-5 for the concrete block, the foam + block is R-15 total.

Asked By David Pfeffer | Feb 26 15
3 Answers

Are leaks in a structure...

Checking for leaks? is the Green's leakage decreased in homes, now that it has gone green? Or, is it basically the same / near or = to studies (in normal construction techniques)?

Asked By arf shr | Feb 8 15
Register for a free account and join the conversation


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