Very nice how-to article on how to repair a raided seam sheet of vinyl flooring.
“Sheet vinyl flooring covers a large area of floor with minimal seams, but over time the adhesive can lose its bond, and the seams may rise as a result. Raised seams not only ruin the look of your floor, they present tripping hazards. By putting off the repair, it can lead to further damage to the floor. Most homeowners can repair a raised vinyl flooring seam in just a few steps.
Step 1Apply heat to the flooring around the raised seams using a hair dryer. The heat from the hair dryer softens the vinyl, which prevents it from cracking as you repair the seam.
Step 2Lift the raised section of vinyl flooring up from the floor, and then scrape as much old adhesive from the subfloor as possible with a putty knife. If both sides of the seam have lifted, do the same on the other side.
Step 3Remove large chunks of adhesive as you scrape, and then vacuum debris, dirt and dust from the subfloor beneath the vinyl flooring.”