What would be the R value rating of Spray in Expanding Foam or the use of Structural Insulated Panel SIP over traditional R-11 fiberglass batting in the walls of a home?

The R-value of expandable foam depends upon the type of foam used. Close-cell foam has an R- Value of about 5-6 per inch of thickness. Open-cell foam has a rating of about 2.5 to 3.5 per inch. However, Open- cell foam has quite a bit more sound-proofing ability than close-cell foam. For home insulation, you will need a vapor barrier as well.