Spray foam duct insulation?

[mtlogcabin]

I have a proposal for spray applied foam to be used on ductwork in a SFR vented crawlspace. Anybody have experience with this procedure

We use the 2009 IMC for com and residential

http://swdurethane.com/documents/112_013.pdf

604.4 Foam plastic insulation.

Foam plastic used as duct coverings and linings shall conform to the requirements of Section 604.

This is the product and ES report. No mention of applying the product specifically to metal ducts. My concern is this will be a gas fired furnace and I am not sure about the air temps from the furnace and how that might effect the foam.

http://swdurethane.com/documents/112_013.pdf

http://www.icc-es.org/reports/pdf_files/ICC-ES/ESR-2003.pdf

 

[Francis Vineyard]

IRC allows it, SFP is used frequently here. Apparently the closed-cell comment is in error.

At the final code hearings May 21, 2007 in Rochester, NY the International Code Council (ICC) approved the use of closed cell SPF as insulation over ducts in attics and crawl spaces for residential buildings. The code change was approved in the International Energy Conservation Code (IECC) and the International Residential Code (IRC) however, it was not approved in the International Mechanical Code (IMC). Because the IMC takes precedence in the International Building Code, SPF is not yet approved as insulation on ducts inside attics and crawl spaces of commercial buildings.

http://www.inhomefoam.com/sprayfoamnews_ICC.html

Francis