For commercial flat-roof recoveries
https://long-wizard-8b2.notion.site/A-Roofing-Contractor-can-repair-or-replace-roofs-covered-by-asphalt-shingles-3b16da13525d8034be33fb83c4efdefd
For commercial flat-roof recoveries, a Roofing Contractor can help determine whether adding a TPO or PVC layer is suitable for the situation.