How to build a new basement floor over uneven styrofoam?

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Posted by: from Montreal
7/6/2019 at 9:19:42 AM

I'm going to build a subfloor in my basement over top of what's there now. Right now there is gravel, then poly vapor barrier, then pink styrofoam insulation and then 1/2 plywood. The floor is uneven at the moment, the highest point being 1.5" higher. I have 4.5" to work with if I leave the plywood there. What is the fastest way to build a deck style floor on top? Should I remove the plywood and build it right on the styrofoam or should I leave the plywood there and just put floor joists right on top?

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Date/Time7/7/2019 at 12:36:47 PM

When building a floor like that it's always best to have the floor joist On Solid ground or concrete then you insulate in between and put the vapor barrier on top before you put the plywood. Once this is done if it's not perfectly level you can use self leveling product before finish floor. Self-leveling product is not recommended for hardwood. I do recommend you calling a trusted Pro contractor in your local area since without seeing your project it is very hard to give you the best recommendations

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