Thank you for posting your feedback on the DAP Touch ‘n Foam Pro System 15 Kit. This kit is DAP's smallest two-component spray polyurethane foam kit. As with all two-components kits, coverage is expressed as a board foot, this is defined as 12” x 12” square by 1” thick. A System 15 Kit is designed to provide 15 board feet or 1.3 cu. ft. (theoretical output) when properly applied. Even small variations in application conditions, application technique and/or the depth/thickness of applied foam can significantly impact the product's coverage rate. Because you did not provide sufficient background details, there is no way to determine if your coverage expectations are in line with the product's theoretical output. At your convenience, please contact DAP’s Technical Customer Service Department at 888-327-8477 so that we can obtain some additional information from you.