[Bldg-sim] Per 90.1, mass wall or steel-framed wall?

[Nick Caton]

To round out the topic:  Outside the context of LEED/Appendix G modeling (if you're concerned with prescriptive compliance), the threshold of what constitutes a mass wall is based on heat capacity (thermal mass), defined further in the 90.1 definitions.

I once looked hard at the issue and came away with this easy rule of thumb: any wall construction including a course of standard 4" brick exceeds the threshold and can be considered a mass wall.  I would expect pretty much any wall including CMU to follow suit, filled or not.

~Nick
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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Ramana Koti
Sent: Friday, May 03, 2013 10:41 AM
To: Nathan Kegel
Cc: Bldg-Sim
Subject: Re: [Bldg-sim] Per 90.1, mass wall or steel-framed wall?

Thank you guys, that was helpful.

Ramana.

On Fri, May 3, 2013 at 11:11 AM, Nathan Kegel <nathan.kegel at iesve.com<mailto:nathan.kegel at iesve.com>> wrote:
Assuming it's new construction, of course.

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From: bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org> [mailto:bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org>] On Behalf Of Chris Baker
Sent: Friday, May 03, 2013 9:49 AM
To: Ramana Koti; Bldg-Sim
Subject: Re: [Bldg-sim] Per 90.1, mass wall or steel-framed wall?

Ramana,

Per Table G3.1 section 5b, the baseline is always a steel-framed wall for Appendix G modeling. So you get to take credit for additional thermal mass.


Chris Baker

AIA, PE, BEMP, BEAP,
LEED AP BD+C


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________________________________
From: bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org> [mailto:bldg-sim-bounces at lists.onebuilding.org]<mailto:[mailto:bldg-sim-bounces at lists.onebuilding.org]> On Behalf Of Ramana Koti
Sent: Friday, May 03, 2013 9:37 AM
To: Bldg-Sim
Subject: [Bldg-sim] Per 90.1, mass wall or steel-framed wall?

Dear all,

For a LEED EAp2/EAc1 energy model, does the following above-grade wall situation fall under a mass wall or a steel-framed wall in the baseline?

8" CMU wall (load bearing) with steel studs to the interior just to create a cavity for the batt insulation etc.

Thanks,
Ramana Koti.

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