Vinyl Plank underlayment for basement
I'm completely decided that the finished floor will be Luxury Vinyl Plank, from either Torlys or Fuzion Floors (both have the anti-microbial cork backing). Torlys slightly gets the upper hand because they're the only vinyl plank manufacturer that makes vinyl stair treads/risers/bull-noses to match the floor.
I have absolutely NO issues with water leaks or moisture in my basement and humidity levels are incredibly stable throughout my home year-round. So, my #1 priority is floor warmth/comfort/quietness (opposed to water resistance). That being said, I had planned to use the Dricore R+ (with the grooved styrofoam adhered to OSB... not the plastic dimpled version) subfloor tiles, which has an R-value of 3, with either of the above-mentioned cork-backed vinyl plank products.
I was speaking with a contractor that was pushing the Torlys product and he was adamant that I did not need to use a subfloor (downplayed the Dricore R+) and insisted that I ONLY use the Torlys LV-Pro Underlayment directly on top of the concrete slab. He claimed that this floor would be "very warm and I could walk bare feet". I had a look at the sample, and this product is soooo thin, really not much thicker than the sill gasket foam I used under the bottom of my wall's sill plates, but the foam was more dense. There's hardly any info about this product online. I found one source that states this product has an R-value <1
I'm just having a really hard time believing that this product would be warmer than Dricore R+ subfloor.
Sure, Dricore R+ is certainly a thicker product and I lose just under an inch of head room (not a big deal since my basement ceilings are about 7'5").
Does anyone have any experience using the Torlys LV-Pro underlayment in a basement.... or any underlayment foam (not DMX 1-step) directly on concrete, for a finished vinyl plank floor?
EDIT: Turns out the contractor's recommended Torlys product is actually called "Torlys XV" not Torlys LV-Pro. It's still a very similar thin foam sheet. I can't find ANY info about Torlys XV anywhere on the internet.