Vertical Insulation: Continuous insulation is applied directly to the slab exterior, extending downward from the top of the slab for the distance specified.įully Insulated Slab: Continuous insulation extends downward from the top of the slab and along the entire perimeter and completely covers the entire area under the slab. Horizontal Insulation: Continuous insulation is applied directly to the underside of the slab and extends inward horizontally from the perimeter for the distance specified, or continuous insulation is applied downward from the top of the slab and then extends horizontally to the interior or the exterior from the perimeter for the distance specified. For example, "R-10 at 36 in." means that insulation with a rated thermal resistance of 10 must be installed and that the insulation must extend a distance of 36 inches form the top surface of the slab. 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: The publication offers crucial supplement for professionals concerned with ventilation and indoor air quality.Slab-on-Grade Insulation Requirements in ASHRAE Standard 90.1 The user’s manual is intended to support building professionals, including architects, engineers, manufacturers, plan examiners, field inspectors, general and specialty contractors, and operation and maintenance personnel. “The user’s manual assists in the design, installation, and operation of buildings in accordance with Standard 62.1-2019,” said Wayne Thomann, chair of Standard 62.1 Project Monitoring Subcommittee. “It is important to remember that Standard 62.1 is written to be code enforceable, and therefore contains only mandatory language, while the user’s manual paraphrases and explains the requirements, making it a valuable resource for both the architects and engineers designing the building and those responsible for constructing, operating and maintaining the building. The user’s manual facilitates compliance with the performance requirements defined in the standard.” The publication was created to be used alongside ANSI/ASHRAE Standard 62.1-2019 and explains how to apply the criteria set out by the standard, by providing examples, sample calculations, and best practices for professionals concerned with ventilation and indoor air quality in nonresidential buildings. The latest 62.1 user’s manual focuses on ASHRAE’s primary ventilation standard, ANSI/ASHRAE Standard 62.1-2019. ASHRAE has released the 2019 edition of the Standard 62.1 User’s Manual.
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