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The goal of the Building Performance Knowledge Community (BPKC) is to promote architects as leaders in the application of technical design for building performance; in the use of high-performance design criteria, codes, and standards; and in programming, designing and managing building performance. To advance, disseminate, and advocate—to the architecture profession, AIA members, building owners, the construction industry, the academy, and the public—design practices that create buildings that are healthy, energy efficient, and durable.

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"Details Forum"

  • 1.  "Details Forum"

    Posted 05-12-2019 17:27
      |   view attached
    The "Details Forum" is a major project in 2019 of the Building Performance Knowledge Community (BP-KC).

    The objective is to provide online information that shares good details among architects via a web location within the BP-KC site.  Another focus is to provide a vehicle for publicizing the activities of technically-oriented architects.

    A draft detail of a Parapet has been prepared as a test case for implementing a first draft of the "Details Forum."
    See the attachment.

    Stay tuned for this first draft to be published soon.

    Project participants are:
    Brad Gellert (lead)
    Stephen Katz
    Drake Wauters


    ------------------------------
    Joseph Deringer AIA
    Institute for Sustainable Performance of Buildings
    Berkeley CA
    ------------------------------

    Attachment(s)



  • 2.  RE: "Details Forum"

    Posted 05-14-2019 16:05

    Thanks for the message about the start of the Details Forum. What a great idea. And an excellent example as the inaugural article about parapet thermal performance. Thanks to Payette for sharing their research and analysis. Very thoughtful way to address a common issue. We have had concerns about building a parapet on top insulation, perhaps crushing the insulation material and reducing its effectiveness. However, the simple approach of inserting insulation within the framing at the level of the roof insulation is a good approach. Thanks, again.

    Sherman Aronson

     
     
    Sherman C. Aronson, AIA, LEED AP BD+C
    Senior Associate
     
        
       
    1216 Arch Street
    Philadelphia, PA  19107‑2835
    Tel: 215 563 3900 Ext: 124
    www.BLTa.com
     
     
     


    NOTICE
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  • 3.  RE: "Details Forum"

    Posted 05-16-2019 07:44
    I have a retail client interested in trying frost protected shallow foundations for their stores.  Can anyone tell me of someone who does them regularly so we can learn from them and develop some confidence?
    William J. DeVos
    APD Engineering and Architecture
    237 Rockingham Street
    Rochester, NY   14620
    (585) 435-0364
    <rflbilldevos@gmail.com>





  • 4.  RE: "Details Forum"

    Posted 05-17-2019 17:36
      |   view attached
    We have done them. The American Society of Civil Engineers has a "Design and Construction of Frost-Protected Shallow Foundations". See attached. Your air freezing index is probably similar to mine. I recommend a civil or structural engineer for the foundation design.

    ------------------------------
    Mike Sealander AIA
    Sealander Studio
    Brooklin ME
    ------------------------------

    Attachment(s)

    pdf
    ShallowFndn.pdf   1.67MB 1 version


  • 5.  RE: "Details Forum"

    Posted 30 days ago
    Wow Mike, Thank you.  i was doubtful i'd get a response.  I am familiar with the ASCE guide, but it's great to see your marked up copy!  Would it be possible we could talk sometime more about your experience and what engineers you've used?  i have two geotechs who have had only a little experience and less with structural and civil.


    William J. DeVos
    APD Engineering & Architecture
    237 Rockingham Street
    Rochester, NY   14620
    (585) 435-0364
    <rflbilldevos@gmail.com>





  • 6.  RE: "Details Forum"

    Posted 28 days ago
    ​I did this one time for an exterior application that needed frost protection but had too many buried utilities on the site. It worked. It is a very interesting concept that should work.

    Our neighbors to the north are the experts in this area I believe. Perhaps it would be useful to contact the Canadians.

    ------------------------------
    Paul Johnson FAIA
    SmithGroup
    Detroit MI
    ------------------------------



  • 7.  RE: "Details Forum"

    Posted 28 days ago
    Thank you Paul, it's good to hear of your success too and that's a really good idea to look to the Canadians.  I'll see what i can learn.

    Thank you, Bill.
    William J.  DeVos, AIA
    Senior Architect
    APD Engineering & Architecture, PLLC
    615 Fishers Run, Victor, New York 14564
    T:  585.484.1302
    ǀ M:  585.435.0364 

    <rflbilldevos@gmail.com> <wdevos@apd.com>





  • 8.  RE: "Details Forum"

    Posted 24 days ago
    I think a Section here on building details is a great idea and the parapet, a very common problem area, is a perfect place to start.  The details presented compare two routes for the thermal barrier to follow at the parapet.  The discussion suggests that short-cutting the thermal barrier across the base of the parapet will have the advantage of reducing the total surface area of heat-transmitting wall exposed to the exterior. The proposed thermal shortcut uses spray foam inserted between the metal studs.  Some things to consider:

    1.     The vertical studs penetrate the spray foam so the R-value of the foam has to be de-rated accordingly.

    2.     To place the spray foam as shown would require a horizontal sheet "backer" closing off the space between studs.  The detail does not show what the backer material might be or how it would be held in place.  Often, vertical studs are doubled around openings and close-packed at corners multiplying the labor and practical problems of placing the backer and the foam.

    3.     Placing the spray foam: Is it placed from below via long nozzle inserted up behind the beam?  Installers have told us this is not practical.  Placed from above before the parapet is sheathed?  This can create construction sequence issues.

    4.     But the most unpredictable risk is the possibility of condensation forming in the un-vented, un-tempered, space above the foam.

    The discussion assumes the necessity of a parapet.  If optimum thermal performance is a goal, then early design discussions should question this necessity.

    ------------------------------
    Alan Swift AIA
    Director, Design Integration
    dbHMS Design Build Engineering
    Chicago IL
    ------------------------------



  • 9.  RE: "Details Forum"

    Posted 18 days ago
      |   view attached
    Hi everyone, this is a great discussion one which I can help with feedback. I rarely build these days, I was/am a licensed builder with a carpentry trade background, so I have a bit of an idea what's going on.
     I am in Australia and I know that a lot of our building regulations and methodologies overlap, so I thought it may be of some interest to see a few details that I created. I do all of my details in 3D, I actually animate them in Sketchup so our subcontractors get it right the first time. Here is an example https://3dlibrary.rubysketch.com/entries/pronto-panel-3d-residential-detail
    I've attached a 3D model, you can open it in Chrome or Internet Explorer. FYI. The attached 3d file is my method of communication these days, I have pretty much given up on paper; I no longer share plans, 3D models & more importantly IP, I only send the detail they need to get the job done.

    There are plenty of details if you care to look, I would be interested in hearing your thoughts.
    Regards Andrew Dwight
    BTW I will be attending the AIA conference in Vegas next week, so if you hear and Australian accent, come and say G'day. B)


    ------------------------------
    Andrew Dwight
    Designer/BIM manager AAD Build
    Sydney Australia
    ------------------------------



  • 10.  RE: "Details Forum"

    Posted 13 days ago
    Hi Alan,
    Thanks for the great comments you seem to be the only person in this discussion who noticed the condensation issue, so I'll direct my response to you (though it would be nice if others addressed the topic of the OP).  The detail attachment file stated that "The question with the non-Dow details, is there a danger of condensation occurring in the cavity in the parapet wall above the insulation level?"  It looks to me like the non-Dow detail has an unlabeled layer of 5/8" thick sheathing material continuous on back side of the parapet.  That looks like a potential path for vapor transmission into the cavity.  Do you think it would help to break the continuity of the layer like they do in the Dow detail?

    ------------------------------
    Richard Linsky AIA
    Project Architect
    Jacobs/Wyper Architects, LLP
    Springfield PA
    ------------------------------



  • 11.  RE: "Details Forum"

    Posted 12 days ago
    The idea of sharing and discussing details is great!

    I do have another comment on the parapet details: I do not find a clear indication of the continuity of the air barrier on these details.  Certainly, making sure we have continuous thermal insulation is important, but if there is air leakage at the roof/wall intersection, then the thermal barrier is compromised and moist air will condense where we don't want it.
    • For the wall, spay foam insulation can serve as an air barrier, but how does it transition to membranes?  What happens when we use rigid foam insulation boards instead of the spray foam?
    • For the roof, do we want the single-ply membrane to serve as the air barrier, or are we using a air/vapor retarder membrane below the roof insulation to serve this purpose?  In either case, how are penetrations sealed?
    • And then, how does the roof air barrier meet the wall air barrier?


    ------------------------------
    Margaretha Eckhardt AIA, CSI, CCS, LEED AP
    Payette Associates, Inc.
    Boston MA
    ------------------------------



  • 12.  RE: "Details Forum"

    Posted 12 days ago
    @Margaretha E. Eckhardt AIA, CSI, CCS, LEED AP ​, Great point - I was wondering the same thing.  A detail like this should clearly indicate the various barriers and their continuity.  Unfortunately, the detail in the attachment doesn't provide enough information.

    ------------------------------
    Richard J. Linsky, AIA, CSI, CDT, NCARB
    Project Architect
    Jacobs/Wyper Architects, LLP
    Philadelphia, PA
    ------------------------------



  • 13.  RE: "Details Forum"

    Posted 12 days ago
    @Joseph J. Deringer AIA, I'm enjoying this discussion, but I'm wondering about the goal of posting the detail in this forum.  Is the intent to come up with constructive criticism that will improve the detail that is ultimately posted on the "Details Forum"?  Or is it simply a point of departure for discussing the depicted condition?  TIA for clarifying! ​​​

    ------------------------------
    Richard J. Linsky, AIA, CSI, CDT, NCARB
    Project Architect
    Jacobs/Wyper Architects, LLP
    Philadelphia, PA
    ------------------------------



  • 14.  RE: "Details Forum"

    Posted 11 days ago
    Perhaps the parapet detail can serve as an example that we can all comment on and once it has been updated to address the group's comments it can serve as a model for development of other details.  It is not realistic for us to develop a complete set of all possible details, but if there is a set of good, thoroughly thought-through generic details, it would be a good resource for working through the specific details for our projects.

    ------------------------------
    Margaretha Eckhardt AIA, CSI, CCS, LEED AP
    Payette Associates, Inc.
    Boston MA
    ------------------------------



  • 15.  RE: "Details Forum"

    Posted 11 days ago
    Looking forward to the first draft. Thanks for sharing!

    ------------------------------
    Sarah Gudeman
    Mechanical Engineer
    Morrissey Engineering
    Omaha NE
    ------------------------------