Community: Building Code Questions

[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!

Does green building seem to be at odds with the code?

Please encourage your building inspector to come here and participate in this Code Q&A; in the meantime, jump in with your experiences -- both positive and negative.

0 Answers

My organization, the Northwest EcoBuilding Guild, Olympia, WA, just launched a new website, the Code Innovations Database, Its a new resource with one simple goal in mind: “making it easier to build green.” www.CodeInnovations.org.

Asked By Chris van Daalen | Apr 23 14
4 Answers

I have a 1971Lancer double wide mobile home with hardboard exterior walls that seem to be toxic. I am sensitized to chemicals due to chronic pain and fatigue. The hardboard has a strong petrochemical aroma when the sun heats it; or when i open up the wall space, such as when working on an 120v wall box. I have been around all the other house components before (vinyl, paint, carpeting, MDF, etc) and have finally realized its the hardboard that is the main culprit.

Asked By Joe Tichenor | Apr 18 14
1 Answer

In climate zone 2 what is the required R value if doing sealed crawlspace and insulating foundation walls instead of floor? Table N1102.1 lists crawlspace walls. Is this for sealed and when not insulating the floor? That value is 0 for my climate zone. Is that accurate or is that for vented?

2nd question:
Should an air exchange (in addition to air supply to crawlspace) be installed in the above scenario? I think the code asks for it but I read somewhere (possibly on here) that the positives are outweighed by the negatives. Is that true? Is it preferable to not install that?

Asked By Chris Purvis | Apr 7 14
24 Answers

I have a flat unvented roof on my 100-yr old rowhouse in Philadelphia, climate zone 4. There is about 18" between the top of the ceiling and the bottom of the roofdeck. I'm looking at my options for air sealing and insulating this roof--there is currently no insulation at all.

Asked By Andrew Levitt | May 4 11
5 Answers

My foundation contractor didn't install any anchor bolts in the slab for my new house.
Are there any anchor bolts that meet code that I can install? Wedge, epoxy, etc.?

Asked By Mark Breitenfeld | Mar 23 14
1 Answer

I am building a non-vented flat roof in CEC zone 8/ DOE zone 3-92705. Roof structure will be structural sheathing on 12" I-joist. For slope, sheathing over 2x furring strips (1/4"/12"). I have read all the posts about various ways to insulate.

If the actual roof is something like a 2-ply SBS membrane and the insulation under the structural sheathing is a closed-cell flash-and-batt system, should I worry about the spaces between the 2x furring strips used over the structural sheathing for slope?

This space will not be vented. Will this space trap moisture?

Asked By keith messick | Mar 14 14
7 Answers

Do 5/32" and 3/16" suffice as window panes? Can they affixed to each other to achieve greater thickness to abide by codes?

I have a bunch of 6 ft by 7 ft glass panes that are 5/32" and 3/16" inches thick, I also have shipping containers I am considering furnishing into a commercial business/cafe. Please take note I am an absolute novice in construction at almost every regard and still in the information gathering stages, so I am trying to acquire as much information as possible before I need to spend money and if I can make use of what I already own, that can save me lots.

Asked By human being | Mar 9 14
4 Answers

First of all, I have a guide book to the code but not the actual code book. I have read the section on egress over and over, I have looked for answers on the net and as you can imagine it is up to how someone interprets the code. There is a lot on handdrail but nothing that says stair treads have to be a min. of 36" which is what half of the people seem to think. The only reference to 36" that I have seen is for above the handrail. That is not an issue for me. I need to know if I have treads between the timber stringers, can they be 32"? I need to do a 4 step landing at bottom turned 90 degs.

Asked By John H. Stehman | Feb 14 14
1 Answer

Felt or Tyvek?

Asked By ray hemming | Feb 8 14
1 Answer

Last year I undertook a whole house outsulation project in Coastal Connecticut climate zone 5 with 1 inch polysio. New vinyl siding and new construction vinyl windows were also installed during the project.

This was passed during our inspection and permitting approval process and thanks to the research on this site was able to undertake the project with confidence.

Asked By Paul Krsiak | Feb 7 14
Register for a free account and join the conversation


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