Rosin paper is used under hardwood flooring to provide a vapor barrier.
Rosin Paper Under Laminate Flooring. With thinner vinyl flooring construction, adding a foam underlayment can effect the locking system strength. You should use one of the following, foam.
All About Underlayments from www.hoskinghardwood.com
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You will need to install it under your wood floors if a padding is not already attached to the hardwood planks.
When laminate flooring is installed, it normally sits on a floating membrane. Place a cushion under the plywood if the finished floor that you are attempting to protect has an irregular surface, like that of mexican saltillo tile. Many models of hardwood planks have dampening foam already attached. Laminate flooring is made by covering a high density fiberboard (hdf) with melamine impregnated paper.
