Plastic foam felt cork and rubber are common choices.
White stuff under floor paper under hardwood floor.
How to use foam underlayment under a hardwood floor.
White silicone vapor paper 400 sq ft roll for hardwood naildown applications over wood subfloors superior alternative for any application where one would use felt red rosin or tar paper does not emit any toxic fumes like asphalt based products 100 recycled and recyclable usa made paper will not mark walls like tar paper can be used with.
Installation of hardwood flooring using wax paper was common to prevent the slivers from the rough lumber getting caught between the tongue and groove connection of the neighbourhood boards of hardwood flooring.
As a last point i really don t like using tar paper as a hardwood floor underlayment under any conditions as my personal hangup.
The flooring contractor plans to use a vapor retardant paper over the subfloor that he calls hydroguard.
It is a plastic coated paper imprinted.
They offer soundproofing insulation a moisture barrier and added comfort while also helping to level out the subfloor.
The floor will be standard 3 4 x 2 1 4 inch select white oak.