If the subfloor is perfectly smooth plywood then you could install the vinyl directly to it.
How to install glue down vinyl plank flooring on wood subfloor.
Apply floor patching compound to any cracks in the old vinyl to create a smooth surface.
A subfloor is the bottom layer of any floor.
You can t do that with glue down vinyl.
If it is uneven or wood slats you will need to apply 1 4 underlayment to the top.
It can be constructed from wood plywood plastic or concrete.
Assess the condition of the wood.
Vacuum any dust and.
Because vinyl is waterproof floating planks don t require an underlayment especially if they have a backing but you can install a vapor barrier if the floor needs extra moisture protection.
Allow the compound to dry and sand away any roughness with medium grit sandpaper.
When you glue down vinyl plank flooring over a wood subfloor a double layer construction of the wood subfloor is required.
Glue down vinyl plank flooring adheres to the subfloor using either one of two types of adhesives.
So technically if you are installing vinyl plank flooring onto concrete you already have a subfloor.
Step 4 spread the adhesive.
Simply nail the sheets of underlayment to the wood sub floor and make sure everything is covered.