You have to apply it to both the deck and the back of the vinyl.
Can you roll vinyl on cement.
So technically if you are installing vinyl plank flooring onto concrete you already have a subfloor.
The unhappy result will be tiles that either pull up curl or crack.
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.
Allow the cement to dry to the same level as that on the floor then roll the vinyl up so that the cement layer is outside the roll.
Then you have to use a rolling technique that takes practice to gradually roll out the vinyl over the tacky glue without it s.
Any debris on the floor will show through the vinyl and will likely cause damage.
The slab doesn t have to be level for vinyl but it must be smooth and relatively flat.
Fill large cracks and dips with a floor leveling compound designed for concrete.
If you are planning to install vinyl tile on a concrete floor the concrete will need to be prepared correctly or the tile will not correctly adhere to the floor.
But to be honest contact cement is trickier.
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.
The cement board is not smooth.
It can be constructed from wood plywood plastic or concrete.
Just roll it on and blade it smooth.
Although it s possible to install vinyl flooring directly on concrete it s not a great idea.
Roll a thin layer of contact cement onto the rear of the vinyl flooring using a medium nap paint roller.
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I ve seen vinyl separate from the concrete over time in applications like yours plus a.