You need the 2nd layer.
Second floor concrete over plywood.
Duraamen s param 5500 goes on thin in a 3 8 to 1 2 thick application.
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.
Roller painting kit http a.
Go get a bundle of cedar shakes.
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.
Good side plywood is your quot go.
Floating a floor over that lightweight concrete is your best bet.
It lays down ultra flat.
You cannot go over the 1 2 quot.
Many nice products to choose from.
Spacing as you normally would.
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.
Rip them down to 3 shims.
We are building a 2 story condominium complex with concrete slab on grade.
You need something for the second layer called quot underlay quot.
Tacking this row down with a couple finish nails will give you better results then shim and nail through them.
Substrate the thing sitting on your joists.
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.
For the second story a foamed type of lightweight concrete is being used over plywood for sound absorption between floors.
Things i mention in this vid.
Radiantheatflooring concreteflooroverwood mikedayconcrete in this video i m pouring a radiant heat concrete floor over a plywood deck.