Sifu
SAWHORSE
- Joined
- Sep 3, 2011
- Messages
- 2,830
I have a multi-family building, type V construction with each unit using an aquatherm unit located above the bathroom. The plenum that encloses the units is limited to the smoke/flame spread requirements of IMC 602.2.1. Got no issue there. However the bottom of the plenum is constructed out of wood, which is now exposed inside the plenum. First take is not permitted if no smoke/flame spread. BUT, IMC 602.2 allows the plenum construction to be built of the same type of construction as the building. Further, the commentary for the materials within section-IMC 602.2.1 says "this section addresses those items that are installed within plenums, not the materials that bound and create the plenum space". So have any of you run up against this, and what is your take. Seems a little strange to allow wood inside a plenum