If you lay vinyl over it the vinyl will conform to all the imperfections in the cement board and your vinyl flooring will appear dimpled not smooth.
Can you roll vinyl on cement.
Just roll it on and blade it smooth.
Sweep and vacuum the entire floor thoroughly before rolling out the vinyl.
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However some people prefer to add another thin layer of subflooring between the concrete and vinyl.
I ve seen vinyl separate from the concrete over time in applications like yours plus a.
A subfloor is the bottom layer of any floor.
It can be constructed from wood plywood plastic or concrete.
Roll a thin layer of contact cement onto the rear of the vinyl flooring using a medium nap paint roller.
The slab doesn t have to be level for vinyl but it must be smooth and relatively flat.
Although vinyl flooring is flexible it will separate if you install it over an uneven surface so if the concrete has high spots you need to grind them down and if it has low spots or cracks you need to fill them with concrete patching.
Any debris on the floor will show through the vinyl and will likely cause damage.
Fill large cracks and dips with a floor leveling compound designed for concrete.
So technically if you are installing vinyl plank flooring onto concrete you already have a subfloor.
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Although it s possible to install vinyl flooring directly on concrete it s not a great idea.
You have to apply it to both the deck and the back of the vinyl.
Then you have to use a rolling technique that takes practice to gradually roll out the vinyl over the tacky glue without it s.
But to be honest contact cement is trickier.
The unhappy result will be tiles that either pull up curl or crack.