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.
Vacuum any dust and.
If it is uneven or wood slats you will need to apply 1 4 underlayment to the top.
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.
If the plywood is porous prep the subfloor by applying a primer that fills the pores and makes the floor ready to accept the adhesive.
Hard set adhesive is spread along the subfloor and then the vinyl planks are laid down on top.
Assess the condition of the wood.
A subfloor is the bottom layer of any floor.
It can be constructed from wood plywood plastic or concrete.
So technically if you are installing vinyl plank flooring onto concrete you already have a subfloor.
Allow the compound to dry and sand away any roughness with medium grit sandpaper.
You can t do that with glue down vinyl.
When you glue down vinyl plank flooring over a wood subfloor a double layer construction of the wood subfloor is required.
Apply floor patching compound to any cracks in the old vinyl to create a smooth surface.
Step 4 spread the adhesive.