What is the best method for raising the flooring to match hardwood when installing LVP over concrete, while preventing moisture and keeping costs low?
Asked by Amelia Matthews 
2 months ago
Last Updated: July 26, 2024
I started prepping the carpet for new flooring, thinking of putting LVP over the hardwood underneath. I know it might not be the norm, but I’d rather not remove all the hardwood. There’s a spot where the concrete is lower than the hardwood by half an inch. Any suggestions on how to raise the flooring to match? I was thinking of using a 6 mill underlayment and adding half-inch plywood to level it out. Is this a good idea to prevent moisture? I’ve also considered self-leveling compound or a product like Dricore, but that might be pricier. What do you think?
What if you screw half-inch plywood to the concrete using tapcons (make sure to counter sink the screws)? You can also place the plywood over some #15 tar paper if moisture is a concern.
Hey , that was exactly what I was wondering about! 😂 It seems like I might be on the right track.
Just lay down half-inch plywood and cover it all with the LVP.
I’m not too sure about placing plywood on top of a concrete slab – the concrete retains moisture and the plywood soaks it up. It just seems like a recipe for disaster!
Make sure to prepare the concrete before installing the subfloor.
Would ald Zaccaro use adequate underlayment to keep moisture away from the plywood?
I would start with a moisture test first. If there is moisture present, you can apply a sealant directly onto the concrete. I can’t remember the specific product name, but you can easily look it up online or ask a flooring company.
You could try laying down a thick plastic, but I prefer using a self-leveler and adding a transition where the two floors meet.
I poured self leveler on this concrete slab.
Have you heard about LVP flooring?
Whoa, ald Zaccaro!
I’ve heard that Home Depot sells a plywood with a honeycomb material on the bottom specifically for this type of project. It comes in smaller squares, making it easy to install. This option allows for ventilation underneath and can help level it with your hardwood.
Have you considered using a penetrating concrete sealer before adding the plywood?
Plywood comes in half-inch thickness and can elevate the surface for you.