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Do I have a Mass Floor?
March 3, 2020
3:34 pm
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Forum Posts: 1
Member Since:
March 3, 2020
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I‘m seeking clarification regarding the energy code IECC 2012 and C402.2.5 Floors over outdoor air or unconditioned space. We are trying to determine what the floor insulation requirements will be for a new enclosed building we are adding on top of a composite concrete deck which is raised approx. 4’ off the roof of an existing building. The composite lightweight concrete and metal deck is supported by steel beams and steel HSS columns. The weight of the slab and the weight of the metal deck comes in at 35 psf. The light weight concrete comes in at 115 pcf. I believe this qualifies as a mass floor, in which case we would propose using 2-2 1/2” of continuous rigid insulation on top of the concrete slab to achieve the R-10Ci ( zone 4) floor insulation requirement. We would then add backerboard and an interior floor finish on top of the continuous rigid insulation (R-10 ci). In your opinion does the concrete deck qualify as a mass floor and if so would we be meeting the insulation requirements of a mass floor with the described system?  


Thanks in advance

Joshua Kaltreider