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The R-value specification in standard defines both the rated R-value of the insulation and the depth or width of the insulation. For unheated slabs, insulation may or may not be required depending on your climate zone, whether or not the project is residential, and which edition of Standard 90.1 is being referenced. Heat losses from heated slabs are greater than that of unheated slabs because the temperature is warmer. Heated slabs-on-grade will feature hot water pipes or coils embedded within or beneath the slab to provide space heating. Unheated slab-on-grade floor: a slab-on-grade floor that is not a heated slab-on-grade floor. Heated slab-on-grade floor: a slab-on-grade floor with a heating source either within or below it. Let’s unpack the issue in the context of ANSI/ASHRAE/IES Standard 90.1 – Energy Standard for Buildings Except Low-Rise Residential Buildings.įirst, the standard defines two classes of slab-on-grade: Slab-on-Grade Insulation Requirements in ASHRAE Standard 90.1 When it does, project teams will often lean on energy codes and standards to settle the issue. The prospect of slab-on-grade insulation can become complicated. A particular solution may provide great continuity of the thermal barrier but be problematic in terms of constructability. Another configuration may better conceal the insulation yet it allows an undesirable thermal short along the edge of the slab. One arrangement may be more conducive to maintaining a continuous thermal barrier from a wall down through its foundation but it allows unsightly exposure along the building perimeter.

Yet, slab-on-grade insulation can be arranged in a number of configurations, each with pros and cons. It seems like it should not be so complicated. Originally published on Apby BNP Media through the Building Enclosure Blog.