Removed approximately 15,000 square feet of cold tar over felt roof system including insulation. Installed new flat roof system to be fully-adhered Ethylene-Propylene-Diene-Monomer (EPDM) membrane, 60 mils thick. Mechanically fastened new rigid insulation to achieve minimum total R-value of 25. Replaced roof drains. Provided new flashings, pipe boots, counter-flashings, and other roof accessories as required.