I'm helping a family member put laminate flooring in their foyer. Currently there is 20-year-old parquet over top of cement slab. What is the best/quickest/cheapest option. I'm hoping to not have to pull up the parquet if at all possible. Any thoughts on putting foam underlayment down before putting down the laminate? Any increase in the "height" of the floor can be resolved by using reducer thresholds. What do you all think?