Insulation? Foam board vs spray foam.

[DRH1175]

I going to insulate my garage walls and because of Moisture issues I want to use a foam product. I was thinking either of 3 inches of foam board or 2 inches board and a inch of closed cell over that.

Either way I will be using can foam around all edges for a air tight seal. Would there be any advantages to using the Closed cell spray foam in this situation.

[efgh]

I would think open cell would hold water in the small air pockets in the foam around the windows. just my thoughts.

[Broadside]

Closed cell spray foam is the best thing on the market for insulating but as always its the most expensive. I would figure the price and the time cutting the foam board to fit and compare it to the price of just spraying the whole thing with 2 inches(R-14 and air sealed) and see if your time is worth the savings. Closed cell foam is going for about $1.80 to $2.00 a square foot for 2 inches installed from dealers. just my opinion.