Floating a floor over that lightweight concrete is your best bet.
Second floor concrete over plywood.
Rip them down to 3 shims.
You need the 2nd layer.
Plywood substrate in a kitchen metal lath stapled over plywood substrate the installation of calcium aluminate cement based self leveling concrete param 5500 along with expanded metal lath for reinforcement is a successful fast track method to convert a plywood subfloor into a beautiful concrete floor.
When installed correctly your concrete over plywood floor will not permit moisture through will not warp or buckle and will come with all the benefits of concrete in an easy to care for floor.
If you are looking for the beauty and personalization available in decorative concrete flooring you can absolutely achieve this look with an installation over your plywood sub floor without any compromises in quality.
Good side plywood is your quot go.
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Here is step by step diy wood floor preparation for laminate or hardwood floor installation.
Please send us information regarding the proper chemical.
Then shim the new flooring up to meet a flat spanner that rests on another piece of flooring on the other side of the dip.
You need something for the second layer called quot underlay quot.
Go get a bundle of cedar shakes.
Duraamen s param 5500 goes on thin in a 3 8 to 1 2 thick application.
You cannot go over the 1 2 quot.
Radiantheatflooring concreteflooroverwood mikedayconcrete in this video i m pouring a radiant heat concrete floor over a plywood deck.
Tacking this row down with a couple finish nails will give you better results then shim and nail through them.
The minimum plywood subfloor thickness is 3 4 for a 3 4 nailed down floor so you would have 1 1 2 above the existing subfloor.
We are building a 2 story condominium complex with concrete slab on grade.
Substrate the thing sitting on your joists.
For the second story a foamed type of lightweight concrete is being used over plywood for sound absorption between floors.
Many nice products to choose from.
Spacing as you normally would.