You need something for the second layer called quot underlay quot.
Second floor concrete over plywood.
You need the 2nd layer.
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.
Radiantheatflooring concreteflooroverwood mikedayconcrete in this video i m pouring a radiant heat concrete floor over a plywood deck.
Good side plywood is your quot go.
Many nice products to choose from.
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.
We are building a 2 story condominium complex with concrete slab on grade.
For the second story a foamed type of lightweight concrete is being used over plywood for sound absorption between floors.
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.
It lays down ultra flat.
May 4 2020 self leveling concrete concrete overlays the following project was executed by tom zilian of madstone floors from boston ma who created a polished concrete floor over a plywood substrate.
Rip them down to 3 shims.
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.
Roller painting kit http a.
You cannot go over the 1 2 quot.
Floating a floor over that lightweight concrete is your best bet.
Spacing as you normally would.
Duraamen s param 5500 goes on thin in a 3 8 to 1 2 thick application.
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.
Substrate the thing sitting on your joists.
Tacking this row down with a couple finish nails will give you better results then shim and nail through them.
Here is step by step diy wood floor preparation for laminate or hardwood floor installation.