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Green Building News

Marc Rosenbaum Offers a Free Online Lecture

On September 4, Rosenbaum will give a free presentation on calculating heat loss to the ground

Marc Rosenbaum is an energy expert and educator who offers online courses to architects and builders.

Heat loss from basements and slabs to the ground is complicated. If you’re interested in learning more on the topic, you might want to take advantage of a free lecture being offered by energy expert Marc Rosenbaum.

At 1:00 p.m. on Thursday September 4, 2014, Rosenbaum will offer a free online lecture on heat loss to the ground. The presentation is intended for architects, builders, and others who want to have a better idea about how buildings interact thermally with the ground and how to calculate heat loss to the ground.

THERM and the Los Alamos algorithms

Starting with with the 2D THERM model of a basement, Rosenbaum will look at the U-factor that THERM calculates for the foundation assembly, and use that to calculate the design heat loss of the basement, and estimate the annual heat loss as well.

He will then do a quick reality check to vet that calculation, and present the simplified Los Alamos algorithms for calculating heat loss from basements and slab-on-grade foundations. These algorithms will be applied and compared with the THERM calculation.

Rosenbaum will also discuss how to apply these algorithms to a walk-out basement condition. Finally, he’ll look at how to estimate design heat loss in the case where the insulation is in the frame floor over a basement.

For more information on Rosenbaum’s free online lecture, click this link: Understanding and Calculating Building Heat Loss to the Ground.

Once again, Rosenbaum will offer a course on net-zero homes

Rosenbaum’s free lecture is a teaser to lure prospective students to his online course, Zero Net Energy Homes, scheduled to begin on September 15. The Zero Net Energy Homes course is part of NESEA’s Building Energy Master Series.

The tuition for that 10-week online course is $895. Enrolling in the course includes a membership in NESEA and discounted admission to the Building Energy conference in Boston. For more information, click here: Zero Net Energy Homes.

Marc Rosenbaum is a well-known energy consultant and the director of engineering at South Mountain Company on the island of Martha’s Vineyard in Massachusetts. He is the author of many Green Building Advisor articles, including Minisplit Heat Pumps and Zero-Net-Energy Homes and Practical Design Advice for Zero-Net-Energy Homes.


  1. Lloyd Brown | | #1

    Time zone?
    "At 1:00 p.m. on Thursday September 4, 2014 ... "

    1PM in which time zone? EDT? PDT? BST? Did I miss this somewhere?

  2. GBA Editor
    Martin Holladay | | #2

    Response to Lloyd Brown
    I assume that the lecture begins at 1:00 Eastern Daylight Time, but the Heatspring website doesn't specify the time zone.

    For more information, you can contact Heatspring by email: [email protected] .

  3. Peter L | | #3

    No Slab/Below-Grade Foam Allowed
    Since so many of the other GBA forum posters were against below grade foam I assume they will not be attending.

  4. Nick Welch | | #4

    1PM Eastern Time.
    I registered and it says 1PM Eastern time.

  5. Hobbit _ | | #5

    nonlinearities galore
    I wonder if it takes into account whether foundation walls are
    hollow cinderblock or solid, and how much of same is exposed
    above grade...


  6. Hobbit _ | | #6

    direct link
    It's probably be way too late to comment meaningfully on this, but
    at this point there's a video of the presentation out and here's the
    direct link to it for those of us who prefer to not let our browsers
    jump through all kinds of meaningless hoops just to find a media file:

    67 Mb, just about an hour's worth.


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