Cut and Nail Down a Smooth Plywood Underlayment Arrange the 1/4-in. underlayment on the floor in the approximate shape of the bathroom floor and tape the sheets together with duct tape.

If you have an open seam in your vinyl sheet floor, don't procrastinate ... Then, lay wax paper over the seam, followed by a scrap of plywood. Weigh down the plywood with stacks of books or ...