Can I reuse underlayment for vinyl flooring replacement?
I think what you meant was underlayment; but generally, yes you can still use it, unless you suspect or find damage. And scraping up vinyl is so tedious that many people or contractors would not even bother to tear up the old vinyl before laying down another floor, but I suppose that depends on the situation... for example maybe new vinyl over the old vinyl is not a good idea because the old vinyl is not in good condition anymore.