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.

6 Answers

Can an applied veneered cut stone on the exterior of a house in Houston, TX hang over the property line?

Any help appreciated, be it by links, PDFs, response.
Thank you

Asked By Rodrigo Marron | Jan 20 15
3 Answers

Masonry heaters and U.S. building code?

From what I understand US codes require two walls of masonry. My question is can the outer wall requirement be met with " stuco", and if yes is there a minimum thickness? Apparently European codes allow "single wall masonry heaters.

Asked By Jerry Liebler | Jan 16 15
11 Answers

Roof Trusses 4' oc?

Would roof trusses spaced 4' oc fall outside prescribed methods for stud construction of a house in the 2012 IRC and therefore require approval from an engineer (other than the engineers at the truss manufacturer)?

Asked By Jeff Cooper | Jan 9 15
2 Answers

Does Bora-Foam insulation qualify for the IRS energy efficiency tax credit?

I sealed my crawlspace and used Bora-Foam insulation board on the walls. I am unable to find any information on whether it is eligible to receive the tax credit.

http://nisuscorp.com/pest-management-professionals/products/bora-foam

Asked By Justin Shive | Jan 4 15
2 Answers

Does Bora-Foam insulation qualify for the IRS energy efficiency tax credit?

I sealed my crawlspace and used Bora-Foam insulation board on the walls. I am unable to find any information on whether it is eligible to receive the tax credit.

http://nisuscorp.com/pest-management-professionals/products/bora-foam

Asked By Justin Shive | Jan 4 15
1 Answer

Adding a dormer = new ventilation required?

Two friends of mine - one the building owner and the other a contractor - have been renovating an attic and plan to add a 10'x10' dormer. After providing engineering drawings at great expense, our city's building department is now asking for a 'ventilation plan' among other things, in order to get the permit.

It's an old building with no active ventilation in Hamilton, Ontario, Canada. Presumably the Ontario Building Code would mandate the ventilation. I suspect however that my friends are being jerked around by the building department.

Asked By Jonathan Dalton | Dec 12 14
4 Answers

Curious exceptions to the rigid foam thermal barrier

I've noticed that it is common practice for rigid foam to be used on attic hatches and garage doors without being covered by a thermal barrier, which building codes require. Is there some implicit exception for doors/hatches? Or does the small amount of foam used cause it to be simply overlooked?

Asked By Nick Welch | Dec 11 14
8 Answers

Span tables for dead loads above 20 PSF.

Does anyone know where I can find span tables or equations to calculate dead loads in excess of 20 PSF?

Every table I've found including IRC, AF & PA show dead loads of only 10 or 20 PSF. I'm looking to see my options for a pour over a subfloor I'm designing for an addition. I do plan on having a Structural Engineer double check my math and stamp the drawings, I just would prefer not to pay them and extra $500-600 to pretend like it took them all day to do a set of calculations for the floor joist, girder, and columns.

Thanks for any help in advance!

Asked By Michael McArdle | Dec 6 14
2 Answers

Moisture in sleeper bays over T&G roof decking?

8 years ago. The existing clerestory low slope roof had 2x sleepers over T&G decking with insulation between with sheathing and a membrane roof over. the new addition duplicated this and the entire roof was re-roofed with a new membrane. the 2X T&G decking is exposed to the living space below and is dry...no leaks. the owner is complaining of a "Soft" roof and suspects that interior moisture is trapped in the 2X sleeper bays and rotting. any thoughts? EPD

Asked By ed spencer | Nov 24 14
11 Answers

Plumbing vents exiting ridge cap

Can't seem to find anything in the code, easily missed though. I have a customer who wants a metal roof installed however they have had bad experiences with pipe flashings through the roof and don't like the look of them. While I don't care for the pipe boots, (for metal roofing), appearance they seem to work well.

Anyway, to the question... Is there anything code or common sense wise that says vents couldn't go through the ridge cap? I know it wouldn't look as good but, would limit water flowing over them.

Asked By RMills Miller | Nov 21 14
Register for a free account and join the conversation


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