The answer to 'how to install roof replacement' is to completely remove and replace the existing roof. This involves tearing off the old shingles, repairing any underlying damage to the roof deck, and installing new roofing materials according to the manufacturer's instructions. The process typically takes 2-5 days for a full roof replacement, depending on the size and complexity of the home.
It's important to work with a licensed and insured roofing contractor who can ensure the job is done properly and safely. They will handle the removal and disposal of the old roofing materials, install the new roof flashing, shingles, and other components, and provide a warranty on the workmanship. DIY roof replacement is not recommended, as it can be dangerous and requires specialized knowledge and tools.