vinyl floor can be glue to your concrete floor, no need to put anything under if the condition of your concrete is good, however, if your concrete floor is not flat, you need put 3/4" plywood or o*****.
vinyl floor can be glue to your concrete floor, no need to put anything under if the condition of your concrete is good, however, if your concrete floor is not flat, you need put 3/4" plywood or o*****.