We had my house spray foamed this week. My agreement states that the ceiling would have 5" of foam applied. As we are starting to put drywall up we are measuring the depth of the insulation and in the majority of locations the foam is between 3 or 4" With runs of ceiling at 2",There are even a few places that are less than 1/2"  My expectations are that the contractor come back out and add more foam, is this something that can be done post install? Has anyone here had this problem before? We are falling behind on drywall etc because of this.