A proper roof replacement begins with a complete inspection and removal of all existing roofing layers, down to the bare decking, which is then assessed for rot, damage, or soft spots that must be addressed before new materials are applied. New underlayment, drip edge flashing, and ice and water shield — particularly important in cold climates — are installed as the foundation of the new roof system. The homeowner must also choose the right roofing material and product grade, as options vary widely in longevity, wind resistance, and warranty coverage. A licensed roofing contractor will ensure the work meets local building code requirements and that the completed installation qualifies for manufacturer warranties.