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PaperclipPerfector  8hr ago (text post)   310 thread views

Friday Fun Thread for March 20, 2026

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ICC (the International Code Council), in collaboration with THIA (the Tiny Home Industry Association), is in the process of developing a new standard for "small residential units and tiny houses", ICC/THIA 1215.

  • The IRC (International Residential Code) already defines "tiny house" as 400 ft2 (37 m2) or smaller.

  • The latest draft of this new standard (available through the "documents" link on this page) additionally defines "small residential unit" as 1200 ft2 (111 m2) or smaller.

The name of the committee is "Standard for Off-Site Construction Tiny Houses", and this collaboration with THIA is building on a previous collaboration with MBI (the Modular Building Institute). However, this new standard will apply, not just to newfangled off-site (wheeled, modular, and panelized) construction, but also to traditional on-site (stick-built) construction.

For ease of visualization, here are examples of "tiny" and "small" floor plans. (I still am waiting for you to post the plan of your dream house (1 2)—or your dream neighborhood.)

(Can we extend this progression? "Normal" ≤ 3600 ft2 (334 m2), "large" ≤ 10800 ft2 (1003 m2), and "mansion" > 10,800 ft2 (1003 m2)? ;-) Generally, for apartment buildings (occupancy R-2) made of wood with no special fire rating (construction type V), the IBC prescribes limits of 7000 ft2 without sprinklers (no longer allowed in new buildings), 21,000 ft2 with spinklers and multiple stories, and 28,000 ft2 with sprinklers and one story. But no such restrictions apply to houses (occupancy R-3).)

This interesting article covers how ICC was caught flat-footed by data centers' sudden rise in popularity. In what occupancy do they belong?

  • Business, like electronic data entry?

  • Moderate-hazard factory/industrial, like lithium-ion-battery assembly and usage?

  • Moderate-hazard storage, like lithium-ion-battery storage?

This has important ramifications for code requirements.

In the end (technically not finalized at the time of this article's publication), the responsible committee decided to put it in moderate-hazard factory/industrial. (See the committee's response to proposal G38-25, contained in the "report of committee action to CAH 1" document on this page.)

ICC is in the very early stages of developing a guideline on data centers. Nothing but a tentative outline has been published so far (in the "documents" on the linked page).

ICC is in the very early stages of developing a guideline on data centers. Nothing but a tentative outline has been published so far (in the "documents" on the linked page).

Data centers have existed for decades. If the ICC hasn't figured out how to handle data centers, then maybe they're really no as important as you suggest.

And clicking that link takes me to this description of the G12 guidelines. I did not think it possible to channel the pompous, verbose writing of an overconfident undergrad without sounding like chatgpt, but damn this committee nailed it.

The G12 Guideline on Data Centers provides a clear, comprehensive, and easy‑to‑navigate framework that aligns the most relevant code provisions for modern data center design and construction. As data centers evolve in scale, operational complexity, and criticality, this guideline brings together key requirements from multiple disciplines, electrical, mechanical, fire protection, structural, water efficiency, and more, into a single, cohesive resource tailored specifically to these unique facilities.

By integrating applicable codes and standards to highlight how they relate within the context of data center operations, G12 enhances understanding for building officials, designers, and developers. It offers a clear pathway for achieving safety, reliability, and sustainability in the built environment, supporting the development of data centers that meet today’s performance needs while preparing for tomorrow’s technological advancements.

Clarification: The current IBC can "handle" data centers under any of the three occupancies listed above. The problem is that data centers are not specifically listed as an example under any of those occupancies, so a builder may run into problems if he thinks that they fall under one occupancy but the municipal code official thinks they fall under a different occupancy.

It is my understanding that similar problems have been noted in many local zoning ordinances (not based on ICC codes—the IZC is nowhere near as popular as the IRC and IBC): data centers are allowed in business zones, or even in residential zones, but because the new extra-power-hungry versions with loud fans are not specifically addressed the municipal code official is forced to allow them in business and residential zones even though loud uses should have been shunted off to industrial zones.

Thanks for the clarification. I'd be curious if there is anything that I would consider a datacenter that is located in a business zone instead of an industrial zone. In my mind, a "server room" doesn't become a "data center" until you start measuring the size in acres.

I suspect this whole effort is basically just Europeans catching up to how Americans already do things in practice. (That's my general uncharitable impression of most standards organizations that start with "International".)

I'd be curious if there is anything that I would consider a datacenter that is located in a business zone instead of an industrial zone. In my mind, a "server room" doesn't become a "data center" until you start measuring the size in acres.

The first result on Google for "data center noise complaints" turns up this location. It's in an "industrial/business" zone (1 2), but right on the edge. I guess the residents just want a bigger buffer between industries and their houses. (Or maybe they're just unreasonable NIMBYs who should have known what they were getting into when they bought a house immediately adjacent to an industrial zone.)

I suspect this whole effort is basically just Europeans catching up to how Americans already do things in practice. (That's my general uncharitable impression of most standards organizations that start with "International".)

No, ICC is a firmly USAian organization. I mentioned in my previous code-related comment that ICC recently rejected a proposal to add some European standards as alternatives to equivalent American standards.

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