30 percent roof rule 3

https://therepairreplaceroofinsight.clearhavendigest.com/posts/roof-repair-or-replace-when-to-fix-and-when-to-start-over

The 30 percent roof rule is a guideline for homeowners and builders that limits the total area of a roof that can be altered or added to in a single project to 30 percent of the original roof surface. This helps maintain structural integrity and prevents overloading the existing framework, which is especially important when adding solar panels or skylights.