675 IAC 14-4.4-54 Section R408.3; unvented crawlspace

Sec. 54. Change SECTION R408.3 as follows: (1) Delete the text of ITEM 2.1 of SECTION R408.3 and substitute to read as follows: 2.1. The walls of the under-floor space are insulated in accordance with Chapter 11 and Section R316 of this code. Uninsulated mechanical ductwork is allowed and shall have no openings into the under-floor space. A hard surface pad with dimensions of at least 16 inches (407 mm) by 16 inches (407 mm) and an electrical receptacle shall be located adjacent to the sump or gravity drain to allow for the installation of dehumidification equipment in the event of high humidity conditions in the under-floor space. (2) Delete the text of ITEM 2.2 of SECTION R408.3 and substitute to read as follows: 2.2. The walls of the under-floor space are insulated in accordance with Chapter 11 and Section R316 of this code with insulation materials listed for the interior of a dwelling, or the materials shall be protected in accordance with their listing. A concrete floor at least 2 inches (51 mm) thick installed over a vapor retarder complying with item 1 of this section shall be installed on the ground surface of the under-floor space. Conditioned air shall be circulated through the under-floor space at a rate of at least 1 cfm (0.03 m3) for each 50 square feet (4.6 m2) of under-floor space. (3) Delete the text of ITEM 2.4 of SECTION R408.3 and substitute to read as follows: Construction of the crawlspace area shall be in accordance with Section R703.8.6 and Figure R703.8.6(1). The crawlspace perimeter walls are insulated in accordance with Chapter 11 and Section R316 of this code, and insulated or uninsulated ductwork supplies conditioned air to the crawlspace area.