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2015 IECC - scoping question for insulation at commercial crawlspace

Discussion in 'Commercial Energy Codes' started by George McGerd, Jun 13, 2017.

  1. George McGerd

    George McGerd Bronze Member

    Dec 19, 2013
    Likes Received:
    2015 International Energy Conservation Code -

    We are renovating a commercial building which has an unheated crawlspace, concrete foundation walls and concrete floor decks. We will be performing IEBC Level 3 Alterations, so it is my understanding that all IECC requirements apply to all areas receiving alterations.

    IECC chapter 4 stipulates prescriptive insulation requirements for "floors" and "walls, below grade". The project is situated in zone 4, so the requirements are U-0.076 (or ± R-13.2) for "mass" floors and/or R-7.5ci for "below grade walls".

    Question: Does the IECC stipulate that the "floors" above the unheated crawlspace must be insulated or can we insulate the below-grade foundation walls to R-7.5 ci only?

  2. TJacobs

    TJacobs Sawhorse

    Oct 19, 2009
    Likes Received:
    You can do either one...if you don't insulate the crawl you will need to insulate the floor.

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