Can I lay parquet directly on this floor?

[snowjim]

Hi,

We have now chiseled up the tiles from the floor, which took 2-3 days. What remains is chipboard with some thin white adhesive (that the plaster was attached to), and in some places, there is a bit of paper from the plaster, which I have tried to remove as much as possible.

This is how it looks:


http://i.imgur.com/mcJNzzH.jpg


http://i.imgur.com/zFqaLcf.jpg

White adhesive


http://i.imgur.com/j6ok18A.jpg


http://i.imgur.com/UMXfLou.jpg


http://i.imgur.com/cHlN5y0.jpg

http://i.imgur.com/WDY2zD9.jpg

Here is a crack about 20-30 cm where the floor gives quite a bit when you step down, I guess the flex is 3-4 mm, but it's firm around it.


http://i.imgur.com/oELmeYG.jpg


http://i.imgur.com/UDqZqo4.jpg

The house has a wooden frame, which means it has some movement even though it was built in the 70s.

The question is whether you can lay parquet directly on this or if you should cast a layer first? The advantage of casting is that it becomes more even, but since the floor might flex a bit, I suspect you need quite a thick layer. This is how the casting looked earlier:



Edit: I can add that the floor to be laid is Kährs Como Oak Matt Lacquer 3-strip. Since you can hear footsteps from the entrance down to the livable basement, step foam will be laid under the parquet.

 

[Jc1972]

I would install parquet on that surface as long as it is generally even. Minor unevenness/roughness doesn't matter.

There are better products than regular foam if you find footstep noise to be a problem, and it's much more enjoyable to do it properly now than to regret it afterward.

 

[snowjim]

I would lay parquet on that area as long as it is mainly even. Minor unevenness/roughness is not an issue.

The answer I hoped for after all the work I put into breaking up the old one

There are better products than regular foam if you experience impact sound as a problem, and it's much more rewarding to do it properly now than to regret it later.

Aha, interesting, do you have any tips? I've only encountered impact sound foam in connection with packaging when we were moving But I know there was a standard thickness and different qualities (hardness) for them. For example, many budget stores had very flimsy foam while the more expensive ones had stiffer foam. I suspect that it's the stiffer type you should go for, but if there are better alternatives, I'm interested!

 

[Jc1972]

Check for example here (there are probably more similar products):
http://prastangen.se/decibel-concept/