Section 675IAC14-4.3-38. Section R314.2.3; attics and crawlspaces

   Delete SECTION R314.2.3 and substitute to read as follows: Within an attic or crawlspace, foam plastics shall be protected against ignition by 1½ inch thick mineral fiber insulation, or ¼ inch thick plywood, or ⅜ inch particleboard, or ¼ inch hardboard, or ⅜ inch gypsum wallboard or corrosion-resistant steel having a base metal thickness of 0.016 inch or other approved material installed in such a manner that the foam plastic is not exposed.

EXCEPTION: Foam plastic insulation may be installed on the walls of attics and crawlspaces with no covering applied provided all the following conditions are met:

1. The maximum thickness/density is within the following:

a. Maximum 4 inch thickness with a maximum density of 4.0 pcf.

b. Up to 2 inch thickness with a maximum density of 2.5 pcf.

c. Up to 1 inch thickness with a maximum density of 2.0 pcf.

2. The maximum flame spread is 25.

3. The maximum smoke development rating is 450.

4. The entry to the attic or crawlspace is made only for service or maintenance (not used for storage).

5. There are not interconnected basement areas.

6. The air in the attic or crawlspace is not circulated to other parts of the building.

7. Where fuel-burning appliances other than direct vent appliances or exposed (not sealed) motors are located more than 10 feet away from the foam insulation in the attic or crawlspace.

(Fire Prevention and Building Safety Commission; 675 IAC 14-4.3-38; filed Jun 13, 2005, 3:00 p.m.: 28 IR 3268, eff 90 days after filing with the Secretary of State; readopted filed Aug 4, 2011, 8:35 a.m.: 20110831-IR-675110254RFA)