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Leveling concrete under vinyl floor

My problem is my heating and cooling ducts were moved to the attic. The old ducts in the floor in a concrete slab were filled with concrete. In my laundry room the duct was not filled level so I filled it with floor leveling compound and then applied vinyl self-stick tile. The compound keeps breaking loose and causing a bulge under the tile. I will remove the tile and chip out the compound. What should I use to fill in the void over the concrete that won’t keep popping up?

My house Tulsa, OK area if this helps.

Re: Leveling concrete under vinyl floor

We always use a latex primer to seal the concrete before we start the leveling process.This helps the leveler to adhere to the floor better.......We use a latex fortifed patching compound that can be used from 1/2 inch to a feather edge.....Sometimes we mix the latex primer with the patching compound for even greater strength.And we always latex primer or use a secondary glue under self sticking tiles

Re: Leveling concrete under vinyl floor

plani-patch works well ....its made by mapi...i think lowes carries it

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