Hi, it is time to start insulation my lemans. I'm thinking about using Eastwoods Thermo-coustic Sound Deadener & Heat Barrier. I want to do floor from the toe boards to under and behind the rear seat. Also the roof, doors and kick panels. A bulk pack for $160 Includes 9 18"x30" sheets to cover a total of 33.75 sq. ft. Will that be enough for what I plan to do or should I order more / less? Thank you in advanced.