Yes. At StormForce we have created a roofing system for all of our roof replacements that includes repair and nailing of the decking; replacing all of the drip edge metal; using a quality underlayment leak barrier; replacing flashings; replacing plumbing boots; installation of ventilation systems; and using quality roofing products. These all work together. Leaving one or more of these out is common and will compromise the life of your roof and your warranty.