Hi friends,
Few months ago, We had found some of the basement floor were getting limp. Which was build from plywood and supported by 2x4 in columns to rise on top of concrete floor. Until recently I finally have time to start changing the floor, At first everything looks fine. But scary picture come in the centre section of the basement. Lots of white things grown under the plywood, I can easily break woods in prices and saw the white mold grown inside the plywood layers. Even the 2x4 can cut like the cheese too. Also I notice those wood weight are much lighter. (Attach with the photos) and now I using a 50-pint dehumidifier to dry up the basement and immediately bleach and clean. All these bad wood now had been removed and left outside my house. Then I used bleach again to clean over that area.
For more detail information, the floor area which had now been removed was actually enlarged by 3 feet in width and length. This is to ensure that there should have left no more mold underneath inside the house.
I am here would like to get input of how to clean this mess and better plan before just cover back the floor. Please tell what kind of chemical that I can use to protect it coming back in the future,
Thanks[IMG]c:\CIMG6617.JPG[/IMG]

Post the pic using Go advanced/manage attachments.

It's proabbably effervescence and will need an acid etch to get rid of + possible painting with Dryloc paint. The etch is critical. Dryloc has it it powder that you mix with water and it's not as bad as the dilute HCL acid called muratic acid.

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Hi friends,
Few months ago, We had found some of the basement floor were getting limp. Which was build from plywood and supported by 2x4 in columns to rise on top of concrete floor. Until recently I finally have time to start changing the floor, At first everything looks fine. But scary picture come in the centre section of the basement. Lots of white things grown under the plywood, I can easily break woods in prices and saw the white mold grown inside the plywood layers. Even the 2x4 can cut like the cheese too. Also I notice those wood weight are much lighter. (Attach with the photos)

and now I using a 50-pint dehumidifier to dry up the basement and immediately bleach and clean. All these bad wood now had been removed and left outside my house. Then I used bleach again to clean over that area.
For more detail information, the floor area which had now been removed was actually enlarged by 3 feet in width and length. This is to ensure that there should have left no more mold underneath inside the house.
I am here would like to get input of how to clean this mess and better plan before just cover back the floor. Please tell what kind of chemical that I can use to protect it coming back in the future,
Thanks

Did you remove every sliver of wood from the entire floor surface? It is very obvious to us that whoever did this floor does not know anything about below grade flooring. I am betting the floor plates under the walls are white wood just like the jacking used under the ply wood. Here is what some pros use. Mold Remediation Products Also the next sub floor you install I urge you to consider Dricore sub flooring. Find out where/how the moisture is getting in because NOTHING PREVENTS MOLD ON A DAMP SURFACE. If a floor gets repeatedly wet mold will start growing in 24-48 hours. Mold Remediation Products

Here is what some pros use Mold Remediation Products This is a duplicate post please go back to your other post and we'll try to merge these. Only start one post and then do all replied on that same post

I just read your other posts so I know why that floor is wet. You need a structural engineer to evaluate what you have, it appears to be a real mess.

This isn't the usual case, but I agree that it's a structural problem.

Here is some info on efflorescence: Efflorescence -- White Fluffy Crystalline Powdery Deposit on Concrete

This, "mold" is generally white and fluffy in appearance. There needs to be a water and a source of concrete like material