For SI: | 1 inch = 25.4 mm. ci = Continuous insulation. NR = No requirement. |
LS = | Liner system—A continuous membrane installed below the purlins and uninterrupted by framing members. Uncompressed, unfaced insulation rests on top of the membrane between the purlins. |
a | Assembly descriptions can be found in Chapter 2 and Appendix A. |
b | Where using R-value compliance method, a thermal spacer block with minimum thickness of 1/2-inch and minimum R-value of R-3.5 shall be provided, otherwise use the U-factor compliance method in Table C402.1.4. |
c | 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. | |
d | Where heated slabs are below grade, they shall comply with the insulation requirements for heated slabs. |
e | Steel floor joist systems shall be insulated to R-38 + R-10ci. |
f | "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. | |
g | Not applicable to garage doors. See Table C402.1.4. |
h | Peripheral edges of intermediate concrete floors are included in the above-grade mass wall category and therefore must be insulated as above-grade mass walls unless they meet the definition of Mass Transfer Deck Slab Edge. The area of the peripheral edges of concrete floors shall be defined as the thickness of the slab multiplied by the perimeter length of the edge condition. See Table A103.3.7.2 for typical default U-factors for above-grade slab edges and footnote c for typical conditions of above-grade slab edges. |
i | For roof, wall or floor assemblies where the proposed assembly would not be continuous insulation, an alternate nominal R-value compliance option for assemblies with isolated metal penetrations of otherwise continuous insulation is: |
Assemblies with continuous insulation (see definition) | Alternate option for assemblies with metal penetrations, greater than 0.04% but less than 0.08% | Alternate option for assemblies with metal penetrations, greater than or equal to 0.08% but less than 0.12% |
R-9.5ci | R-11.9ci | R-13ci |
R-11.4ci | R-14.3ci | R-15.7ci |
R-13.3ci | R-16.6ci | R-18.3ci |
R-15.2ci | R-19.0ci | R-21ci |
R-30ci | R-38ci | R-42ci |
R-38ci | R-48ci | R-53ci |
R-13 + R-7.5ci | R-13 + R-9.4ci | R-13 + R-10.3ci |
R-13 + R-10ci | R-13 + R-12.5ci | R-13 + R-13.8ci |
R-13 + R-12.5ci | R-13 + R-15.6ci | R-13 + R-17.2ci |
R-13 + R-13ci | R-13 + R-16.3ci | R-13 + R-17.9ci |
R-19 + R-8.5ci | R-19 + R-10.6ci | R-19 + R-11.7ci |
R-19 + R-14ci | R-19 + R-17.5ci | R-19 + R-19.2ci |
R-19 + R-16ci | R-19 + R-20ci | R-19 + R-22ci |
R-20 + R-3.8ci | R-20 + R-4.8ci | R-20 + R-5.3ci |
R-21 + R-5ci | R-21 + R-6.3ci | R-21 + R-6.9ci |
1. | The ratio of the cross-sectional area, as measured in the plane of the surface, of metal penetrations of otherwise continuous insulation to the opaque surface area of the assembly is greater than 0.0004 (0.04%), but less than 0.0012 (0.12%). |
2. | The metal penetrations of otherwise continuous insulation are isolated or discontinuous (e.g., brick ties or other discontinuous metal attachments, offset brackets supporting shelf angles that allow insulation to go between the shelf angle and the primary portions of the wall structure). No continuous metal elements (e.g., metal studs, z-girts, z-channels, shelf angles) penetrate the otherwise continuous portion of the insulation. |
3. | Building permit drawings shall contain details showing the locations and dimensions of all the metal penetrations (e.g., brick ties or other discontinuous metal attachments, offset brackets, etc.) of otherwise continuous insulation. In addition, calculations shall be provided showing the ratio of the cross-sectional area of metal penetrations of otherwise continuous insulation to the overall opaque wall area. |