Yes! A subfloor provides a solid surface in your van conversion to secure your finished flooring to. Without a solid subfloor, your finished flooring can lift, crack and warp.
No! It is possible to fasten your plywood subfloor right to the van metal flooring. You would want to run furring strips when you plan on putting insulation between your van metal floor and subfloor.
We would suggest you use 1/2"-3/4" plywood. Plywood is stronger than OSB, so if you do go with OSB be sure to use at least 5/8". If you plan on using a "glue-down" flooring, you will want to use plywood for proper bonding.
Furring strips on a Sprinter Van floor. (3/8")
* Be sure to check under your van floor to insure you don't puncture anything. Another good practice is to silicone each hole you make to make it air tight.
3/4" Subfloor covered in luxury vinyl plank.
This might not be the vans subfloor you're looking at, but its right under that beautiful luxury vinyl plank!
* If you are using vinyl plank flooring or a glue down flooring, make sure to use a plywood with good-one-side (G1S). This provides a solid, smooth surface for optimal bonding.
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