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ASHRAE-90.1-2022- - Page 065

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  1. The roof insulation values in Tables 5.5-0 through 5.5-8 shall be adjusted in accordance with Table 5.5.5.1.1-2. Informative Note: See Informative Appendix K, Figure K-2(b). c. Where a mass wall has interior insulation that represents more than 50% of the total wall insulation R-

value, the interior insulation shall extend to the underside of the roof deck, shall be permitted to be interrupted by framing members, and shall comply with one of the following:

  1. Additional insulation having a rated R-value of insulation not less than R-5 shall extend inward on the underside of the roof deck for not less than 2 ft and be permitted to be interrupted by roof framing members.
  2. Additional insulation having a rated R-value of insulation not less than R-5 shall be placed at the exterior of the roof edge and be located between the bottom plane of the roof insulation and the plane of the bottom of the roof assembly in contact with the exterior wall .
  3. The wall insulation values in Tables 5.5-0 through 5.5-8 shall be adjusted in accordance with Table 5.5.5.1.1-1.
  4. The roof insulation values in Tables 5.5-0 through 5.5-8 shall be adjusted in accordance with Table 5.5.5.1.1-2. Informative Note: See Informative Appendix K, Figures K-2(c) and K-2(d).

5.5.5.1.3 Parapets within the Field of a Roof. Exterior continuous insulation having a minimum rated R-value of insulation not less than R-5 shall be applied to both vertical sides of the parapet and extend from the coping at the top of the parapet to not less than the top of the roof insulation below.

Informative Notes:

  1. See Informative Appendix K, Figure K-3.
  2. Parapets that are an integral part of a fire-resistance-rated wall, and the exterior continuous insu- lation applied to the parapet, shall comply with the fire resistance ratings of the building code.

5.5.5.2 Walls and Intermediate Floor Intersections. A t floor and exterior wall intersections, the exte- rior wall insulation shall comply with Sections 5.5.5.2.1 and 5.5.5.2.2 as applicable to the type of floor intersection, exterior wall assembly, and location of the exterior wall insulation.

5.5.5.2.1 Intermediate floor edges that do not serve as balconies or floor overhangs shall comply with the following as applicable:

a. Where a wall has exterior continuous insulation, such insulation shall extend continuously past the floor

edge. b. Where a wall has cavity insulation that represents more than 50% of the total wall insulation R-value, the

cavity insulation shall extend to the underside of the floor deck and shall be permitted to be interrupted by floor framing members and wall top and bottom plates or tracks. ( Informative Note: See Informative Appendix K, Figures K-4[a] and K-4[b].) c. Where a mass wall has integral insulation that represents more than 50% of the total wall insulation R-

value, the intermediate floor intersection shall comply with one of the following:

  1. The full thickness of integral insulation shall extend past the floor edge.
  2. Where the intermediate floor deck extends through the integral insulation, insulation having a rated R-value of insulation not less than R-5 shall be maintained to the full depth of the floor edge on the exterior side of the floor edge. See Informative Appendix K, Figures K-4(c) and K-4(d). d. Where a mass wall has interior insulation that represents more than 50% of the total wall insulation R-

value, the interior insulation shall extend to the underside of the floor deck, shall be permitted to be interrupted by framing members, and shall comply with one of the following:

  1. Additional interior insulation having a rated R-value of insulation not less than R-5 shall cover the full depth of the floor edge. Such insulation shall be permitted to be interrupted by floor framing members. Fire safing applied to the full depth of the floor edge meets this requirement.
  2. Additional insulation having a rated R-value of insulation not less than R-5 shall cover the full depth of the floor edge on the exterior side of the wall .
  3. The wall insulation values in Tables 5.5-0 through 5.5-8 shall be adjusted in accordance with Table 5.5.5.2.1. Informative Note: See Informative Appendix K, Figures K-4(e) and K-4(f). e. Where mass walls have not less than 50% of the rated R-value of insulation on the exterior side of the

wall and the remainder on the interior side, the insulation on the interior side of the wall shall be permit

ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 63

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