The answer to 'difference between roof installation' is that there are two main options for roof installation: new roof installation and roof replacement. New roof installation involves installing a roof on a new building or structure, while roof replacement involves removing an existing roof and installing a new one.
The key differences between the two include the scope of the project, the materials and techniques used, and the overall cost. New roof installation typically requires more extensive planning and preparation, as the entire roof system needs to be built from scratch. Roof replacement, on the other hand, can be a more straightforward process, as the existing roof structure is already in place.