Vinyl floors under 4mm should be installed right over the subfloor.
Osb underlayment for vinyl.
I should note the imperfections are more due to the nature of how osb versus the smoothness of plywood.
This makes the subfloor almost perfectly flat by evening out the surface with its foam layer making the vinyl lock in place easier and sturdier.
Osb subfloor is mostly serving as a base under the finish floor hardwood engineered wood vinyl tile etc and even below the underlayment in some cases.
The rule of thumb is any vinyl over 4mm can have a vinyl specific underlayment.
Other osb negatives contractors builders and home remodelers have mixed opinions about the use of osb for flooring mostly tending toward the negative.
Direct gluing vinyl sheet and tile to osb subfloorsinstalling a glue down vinyl floor sheet or tile directly over oriented strand board osb subflooring has become a hot topic for me of lately.
Putting a soft product under vinyl plank will result in an unstable floor that is much more inclined to being damaged and even punctured or torn over time.
Particle board is an inexpensive smooth product that can be used for underlayment under carpeting and vinyl flooring.
My subfloor is made of osb and is overall flat but with a slightly roughed up surface.
The subfloor consists of sheet materials that are nailed or screwed to the joists to.
This swelling although undesirable and to be avoided is virtually unnoticeable under a laminate floor unless it is very pronounced.
Vinyl planks require hard thin underlay because the product itself is softer.
While underlayment for vinyl planks may be used under hardwood and laminate the reverse is not true.
Most flooring vinyl flooring manufacturers do not allow direct glue down directly to the subfloor.
With thinner vinyl flooring construction adding a foam underlayment can effect the locking system strength.
Plywood underlayment is usually 1 4 inch thick and sold in 4x8 sheets.
Plywood is recommended and approved as an underlayment by almost all flooring manufacturers including resilient flooring like vinyl.
A typical wood framed residential flooring system is more complicated than you think.
In addition to the visible surface flooring material the carpet tile or hardwood there is usually an underlayment and beneath that is a subfloor that serves as the foundation and structural reinforcement for the floor.
