putting Allure vinyl floating floor in kitchen. removed old stick on tiles, now sub-floor is sticky.
You don't need to put any barrier under Allure, but you do need the floor they are going on to be perfectly smooth and firm. If it isn't smooth, any bumps or dips will eventually show through the vinyl. If it isn't firm, the vinyl will get dents where any furniture sits, or anything else sits for any length of time. If the glue is smooth, I would do nothing before installing the Allure. If it isn't, you are going to have to use a solvent to remove it or install some thin plywood to give you a smooth hard surface. I think I would have left the old tiles and smoothed them out with an embossing leveller.
You have one of two choices. You can either remove the glue from the subfloor or add a layer of lewan board (1/8 thick) to give you a clean surface to adhere your vinyl floor to. Be sure you use the proper adhesive for bonding your floor to wood. Also check the height of the finished floor to make sure the transition into other room is at the same level and doors clear the flooring. If necessary, you can get a thicker underlayment to elevate the flooring to the correct height. Just stay away from OSB (oriented strand board) and especially MDF (medium-density fiberboard, a.k.a. particle board). Both of these decompose with moisture. Stick with good old plywood. It won't let you down.
I have put the allure down on a few different jobs and have been pretty impressed so far. I would just put a sound deadening pad underneath it. It comes in rolls and you get what you pay for quality wise. It is sold in the flooring department, and a good one will cost about 45 cents a square foot. Just duct tape the seams, no need to staple down, and lay your floating floor over the top.
