It is no surprise that machine-welded seams hold the advantage over hand-welded seams, removing the risk of fish mouths and creating a stronger seal between pieces of cover sheet.See our crews in action as they apply the cover sheet to a newly applied commercial roof in Denver, CO. We removed an old, leaky 3 ply Built Up Roof (BUR) weighted down with gravel ballast. We replaced it with a properly draining TPO roof over new ISO insulation and solid Densdeck.If you have questions or concerns about your commercial flat roof (Gravel ballast, TPO, EPDM or PVC), call today for a no-obligation inspection and commercial roof report. Cenco is open every day, and we can always be reached at (720)-583-1690.