Let Versico simplify your next VersiWeld TPO installation with prefabricated Inside Corners. TPO Inside Corners are pre-molded and are used for flashing inside corners on a variety of details. Installation is fast and easy with no cutting or stretching required. Versico’s TPO Inside Corners are part of the Certified Fabricated Accessory (CFA) Program. Certified Fabricated Accessories are the only factory fabricated TPO accessories that meet the stringent quality tolerances required to be included in a Versico warranted roofing system.