Energy Code Reqm't for Aircraft Hangar Doors?

[ETThompson]

Hi

I'm helping out one of my company's other offices on a university aircraft hangar project. S-1 classification, about 12,000sf. Existing metal building structure to remain. We're under the 2024 Ohio Building code and the equivalent Ohio Existing Building code.

The project is essentially a recladding project, using insulated metal panels for the walls and a standing seam roof with a liner system for the roof. Minimal other work inside the building, new MEP, new accesible restroom, and minor fixes.

We have confirmation from the building official that they will accept this project under the OEBC as an "alteration". For the new work then we have to meet the new code, including the new energy code. The OBC gives us either ASHRAE 90.1 (2019) or IECC, we are using the former because our engineer is using ASHRAE and our understanding is you can't "mix and match".

So the prescriptive requirements for the walls in ASHRAE is R-0+R15.8 for the walls above grade.

What requirement would apply to these large hangar doors? There are (6) of them, (3) per side that slide out and stack along tracks. These doors are each 20' high by just under 20' long, with the entire opening about 110' long. Thought we don't have the ASHRAE document (engineer only sent the walls and roof page), the internet says the u-value requirement for doors is .094 for opaque elements. So lower than the requirement than walls.

Haven't done this building type before so appreciate any help or insight you can give.

Thanks

 

[Yankee Chronicler]

Which compliance method are you using?

And why is it being regarded as an alteration? Why isn't it a repair? From the definitions in the OEBC:

[A] ALTERATION. Any construction or renovation to an existing structure other than a repair or addition.

[A] REPAIR. The reconstruction, replacement or renewal of
any part of an existing building for the purpose of its maintenance
or to correct damage.

In general, if you aren't adding, removing, or relocating any walls, doors, or windows it isn't an alteration. From the 2021 IEBC Commentary for section 503.1:

Alterations include renovations, which imply that
something is changed in the structure. For example,
the removal, rearrangement or replacement of partition
walls in an office building is an alteration because, in
part, of the possible impact on the means of egress,
fire resistance or other life safety features of the building.
Conversely, the replacement of damaged trim
pieces on a door frame is considered a repair, not an
alteration.

 

[ETThompson]

Hi

Thanks for the response! We're using the prescriptive compliance method and it is being approached an an alteration because there is more scope beyond what I described - in addition to the entirely new walls and roof (and associated insulation etc), we're replacing the mechanical system, we're replacing an existing restroom with a new accessible one, and adding an Laundry Room, putting on a new floor coating, new lighting, new fans, etc etc. Our assessment was with all that we couldn't call it a repair.

 

[thriftwoo]

OEBC 301.2 says, "Repairs shall comply with the requirements of Chapter 4". It doesn't say repairs need to be classified as alterations if you're also doing alterations elsewhere.