Hi Dave
I'm fond of cellulose myself for the following reasons.1.Cellulose insulation is enviroment friendly,it is THE best example of using recycled materials in isulation,made of 75% recycled materials(newspaper).You can purchase "stabilized" cellulose today which is less prone to settling.But to be fair to Tri polymer it is non CFC non Hcfc however it's recycle content is much lower(most foams are around 10%)Also over time tri polymer is prone to shrinkage-lowering your R-value.Hope that was of some help Dave!

tripolymer will not settle, has a better R-value and will fill any voids, cellulose will get caught on wires and will not fill every where. i also have learned that cellulose installers only expect to fill to 93% of the cavity. tripolymer will fill 100% of the cavity.blower door test have shown that tripolymer drastically out performs other insulation's in a retofit application see more at injectionfoam.com