I priced out that Tiger foam and it is almost as expensive as the pro guy. If I want to match the r- value I was quoted it would cost more. Granted we pay more for Tiger foam up here in Canada but it is the bloody shipping that kills it. Outrageous shipping costs. I was thinking of spraying 1" on the garage ceiling (living space above) and ductwork to seal everything up. Could I then use Fiberglass bats below? I would then have two vapour barriers though. The six mil poly for the glass and the foam acts as a vapour barrier by itself. Not sure that would work?