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How flat does concrete need to be when laying laminate wood flooring?
After removing porcelin tiles from concrete slab, the mastic or adhesive is still stuck to slab. Do I need to remove it by chiseling it all off , or skim coat it, or just lay the laminate with the padding attached right over the mastic?
Answer:
It depends on several things. Is the floor you intend to install: glue down, nail down or floating? If you are going to glue or nail, then yes-the concrete needs to be clean/smooth, you may even have to patch/float low spots. If the floor is floating, then scrape most of the mastic off (special tool-not too expensive), any small imperfections will be hidden by your vapor barrier and padding. If you are skipping the vapor barrier/padding-you are back to needing a smooth and clean surface. The old mastic will cause ripples and cracks in your wood, it may even cause the planks to separate at the seams. Buy or rent the floor spud-minimal effort and about 15 minutes will "clean" a 10 X 15 room. Couple of hints...mist the floor with water (not enough for puddles) and that will keep the dust down; use a shop vac to clean up. A floor spud is a heavy long handle chisel-you scrape the floor while standing up, much better than on your knees.
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