Generally, the contractor would be liable for damage due to water damage resulting from a rain that the contractor knew, or reasonably should have known might occur. In a remodel, where portions of the building are finished and thus susceptible to significant damage if there is water intrusion, the bar is further raised.
As an Owner (assuming that is your 'role') you do not need to be concerned as how the contractor did, or did not protect your property. You only need be concerned about the result.
Aside... use of Fire and Ice or similar self-adhered flashings and membranes as 'overall' waterproofing on roofs (especially in 'attic' applications) can be a poor decision, depending on specific design/detailing of the building, ventilation, whether joist spaces are enclosed or open, local climate, and other factors). Use of a waterproof membrane that does not breathe can in some circumstances cause more problems than it solves. Trapped moisture and/or condensation resulting from its use can end up causing decay of structural components as well as mold in same. You should make sure you discuss this with the contractor (who probably doesn't realize/understand the implications... possibly someone at the building department... or preferably a consultant that specializes in roofing and waterproofing systems as a whole, and has experience in diagnosing and solving moisture problems in structures.