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 Washington Administrative Code (Last Updated: November 23, 2016)
 Title 51. Enterprise Services, Department of (Building Code Council)
 Chapter 51-11C. State Building Code adoption and amendment of the 2015 edition of the International Energy Conservation Code, Commercial.

  Section 51-11C-402141. Table C402.1.4—Opaque thermal envelope requirements, U-factor method.  

Latest version.
  • Table C402.1.4
    Opaque Thermal Envelope Requirementsa,f
    a
    Use of opaque assembly U-factors, C-factors, and F-factors from Appendix A is required unless otherwise allowed by Section C402.1.4.
    b
    Where heated slabs are below grade, below-grade walls shall comply with the F-factor requirements for heated slabs.
    c
    Heated slab F-factors shall be determined specifically for heated slabs. Unheated slab factors shall not be used.
    d
    Exception: Integral insulated concrete block walls complying with ASTM C90 with all cores filled and meeting both of the following:
     
    1. At least 50 percent of cores must be filled with vermiculite or equivalent fill insulation; and
     
    2. The building thermal envelope encloses one or more of the following uses: Warehouse (storage and retail), gymnasium, auditorium, church chapel, arena, kennel, manufacturing plant, indoor swimming pool, pump station, water and waste water treatment facility, storage facility, storage area, motor vehicle service facility. Where additional uses not listed (such as office, retail, etc.) are contained within the building, the exterior walls that enclose these areas may not utilize this exception and must comply with the appropriate mass wall R-value from Table C402.1.3/U-factor from Table C402.1.4.
    e
    "Mass floors" shall include floors weighing not less than:
    1. 35 pounds per square foot of floor surface area; or
    2. 25 pounds per square foot of floor surface area where the material weight is not more than 120 pounds per cubic foot.
    f
    Opaque assembly U-factors based on designs tested in accordance with ASTM C1363 shall be permitted. The R-value of continuous insulation shall be permitted to be added or substracted from the original test design.
    [Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402141, filed 1/19/16, effective 7/1/16.]
RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402141, filed 1/19/16, effective 7/1/16.