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Interpretations Request Input

Original Request

  • Request ID: 8549
  • Requested By: Samuel Cassity
  • Requester E-Mail: Sam@ZAArch.com
  • Code Version: 2021
  • Code: ENERGY
  • Code Description:
  • Chapter:
  • Section: TABLE C402.1.3
  • Topic: CLIMATE ZONE 2, ALL OTHER, MASS, R-5.7ci, Note c
  • Question: Does a typical CMU building with #5 rebar at 4'-0" o.c. maximum in solid concrete fill and 16" deep bond beam at top of an 8'-0" wall qualify as a MASS Building?
  • Comment: None
  • Attachment 1: Download

Existing Interpretations and/or Declaratory Statements Related to this request

Input Received:

This would be up to the designer to provide the calculations on this wall.
David Young on 08/05/2021 at 12:56 PM
agree with David. It is up to the design professional.
Samuel Greenberg on 08/05/2021 at 2:27 PM
Agree, but see what defines the "mass walls" in Section C402.2.1.
Linda Patrick on 08/05/2021 at 6:50 PM
I don't know about a mass building, but it would be a mass wall for energy purposes. While the commercial section of the FBC-EC does not define mass walls, the residential portion does have a definition. The code permits the use of definitions from other volumes of the code when a term is not defined in the volume in question.
Joseph Belcher on 08/05/2021 at 11:55 PM
I agree with Joe.
Timothy Moore on 08/16/2021 at 1:36 PM

Answer:

This would be up to the designer to provide the calculations on this wall.
On 08/16/2021 at 1:01 PM

Commentary:

It could be a mass wall for energy purposes. While the commercial section of the FBC-EC does not define mass walls, the residential portion does have a definition. The code permits the use of definitions from other volumes of the code when a term is not defined in the volume in question.

Comments on Draft:

Concur with response
Larry Schneider on 08/11/2021 at 1:27 PM
Agree with response
Pedro Quintela on 08/11/2021 at 1:38 PM
May want to re-word it. Put the first sentence at the end and maybe write it this way -
Refer to Section C402.2.1 for examples of mass walls.
Linda Patrick on 08/11/2021 at 1:47 PM
1. It is a mass wall because it does not match any of the other choices in that section of the chart, and 2. footnote c states that you can substitute the continuous insulation with an ungrouted masonry wall, so the wall described exceeds the minimum standards of footnote c.
Timothy Moore on 08/11/2021 at 2:15 PM
Agree and I would recommend including the Comment by Tim Moore.
Joseph Belcher on 08/13/2021 at 5:16 PM
Concur with response
Larry Schneider on 08/16/2021 at 1:12 PM
agree
Michael Grimm on 08/16/2021 at 2:07 PM
Why did we get this again? I agree with Tim Moore. This is a mass wall.
Joseph Belcher on 08/17/2021 at 6:47 PM
Sorry, I see why we got it again.
Joseph Belcher on 08/17/2021 at 6:48 PM
Publish Draft Interpretation