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The Custom Residential Architects Network (CRAN®) Knowledge Community develops knowledge and information to benefit architects who are engaged in, or who are interested in learning more about, custom residential practice. CRAN® presents information and facilitates the exchange of knowledge and expertise to promote the professional development of its members via discussion forums, national symposia and conventions, publications, and local activities.

2024 CRAN® Symposium

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2023 Symposium

The CRAN® 2023 Symposium was held October 11 - 15. View the schedule for more info>.

  • 1.  Retrofit existing floor/ceiling assembly to reach STC 50+

    Posted 20 days ago

    As garage conversion to ADU is becoming more and more common, I am coming accross the issue of having to modify the existing floor/ceiling assembly to satisfy the requirement for frire separation, STC 50+ and ICC. This upgrade can be very inconvenient to home owners as they might have to remove the floor finish to provide a sound break underlayment, in addition to other imprvements that can be done from the floor below, specifically, for SFD over a garage.

    I have been doing research and cannot seem to find a way to retrofit the assembly that can demonstrate an actual STC value. The plan checkers seem to rely on pre-approved system like from the Gypsum Association. 

    Am I looking at this the wrong way? Is there a method to provide proof that by decoupling the ceiling, providing acoustical insulation, sealing gaps, adding mass, damping, etc., WITHOUT having to touch the existing floor finish above, it will provide an acceptable/equivalent level to STC?



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    Matias Santini AIA
    Hogan Land Services
    Santa Rosa CA
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    Jain us at AIA24 for practice-related sessions! June 5 to 8, Washington, DC, click here to learn more.


  • 2.  RE: Retrofit existing floor/ceiling assembly to reach STC 50+

    Posted 20 days ago

    have you checked HUD guidelines?

    https://www.hud.gov/sites/documents/DOC_16419.PDF



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    Ivan Contreras, LEED AP, AIA
    CONTRERAS MUNOZ & CO
    Miami FL
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    Jain us at AIA24 for practice-related sessions! June 5 to 8, Washington, DC, click here to learn more.


  • 3.  RE: Retrofit existing floor/ceiling assembly to reach STC 50+

    Posted 16 days ago

    This document had something I could work with. Thank you.



    ------------------------------
    Matias Santini AIA
    Hogan Land Services
    Santa Rosa CA
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    Jain us at AIA24 for practice-related sessions! June 5 to 8, Washington, DC, click here to learn more.


  • 4.  RE: Retrofit existing floor/ceiling assembly to reach STC 50+

    Posted 19 days ago
      |   view attached

    We work on existing buildings all the time and I have found this document, GA-600, from the Gypsum Association the most helpful. 

    Hope it works for you! 



    ------------------------------
    Suzie Van Cleave AIA
    Van Cleave Architecture + Design
    Milwaukee, WI
    ------------------------------

    Attachment(s)

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