The Northeast Independent School District in Bexar County, Texas, hired STR Constructors, Ltd., to renovate a middle school. STR subcontracted the tile work in the school's kitchen to Newman Tile, Inc. (NTI). The project had already fallen behind schedule. As a result, STR allowed other workers to walk over and damage the newly installed tile before it had cured, forcing NTI to constantly redo its work. Despite NTI's requests for payment, STR remitted only half the amount due under their contract. When the school district refused to accept the kitchen, including the tile work, STR told NTI to quickly make the repairs. A week later, STR terminated their contract. Did STR breach the contract with NTI? Explain.