Chapter 6, Table 6-6 B (I-P Units), Notes, is hereby deleted in its entirety and the following provisions shall be substituted therefor:

a. Insulation R-values, measured in (h·ft²·°F)/Btu, are for the insulation as installed and do not include film resistance. The required minimum thicknesses do not consider water vapor transmission and possible surface condensation. Where exterior walls are used as plenum walls, wall insulation shall be as required by the most restrictive condition. Insulation resistance measured on a horizontal plane in accordance with ASTM C518 at a mean temperature of 75°F at the installed thickness.

b. Includes crawl spaces, both ventilated and nonventilated.

c. Includes air return plenums with or without exposed roofs above.

d. Vapor retarders shall be installed on cooling supply ducts in spaces vented to the outside in geographic areas where the average summer dewpoint temperate based on the 2-1/2 percent column of dry-bulb and mean coincident wet-bulb temperature exceeds 60°F (16°C).

e. Insulation shall have an approved weatherproof barrier.

f. Buried heating and cooling ducts do not require insulation.

g. City of Topeka jurisdiction shall use Envelope Criteria Table 5-15 for the climate zone.