I know, I know, this topic is beaten to death here.  However, I searched and am still uncertain which options are best, so I thought I’d add another discussion.

1500 sq ft of cathedral ceiling.  2×6 depth (sistered to 2x4s).  No soffits or roof venting possible.  Kansas City.

First bid came in at $6200 for full depth fill of open cell foam.  This is contrary to all research I’ve read that says open cell would be a bad choice because of moisture issues in the winter.  Also, this yields a lower R value than other options.

Second bid came in at $6800 for one inch of closed cell, with the rest of the depth blown in fiberglass or cells.  This yields R24, but research suggests that half of the R value should be closed cell. (buildingscience.org article)

I started looking at DIY solutions using Foam It Green or Tiger Foam, or rigid foam, in combination with batts.  I could spray 2″ of closed cell and add R13 batts for a total of R26.4 for around $3600 or so.

Thoughts on acceptability of this solution over other combinations?  For example, foamed in rigid foam plus spray, or cc plus oc spray, etc.

Thanks for your time.