How to find if the floor is made of concrete from the external look

Hi,
I am not related with the world of construction but I would be grateful if I could have any help or hints about this issue.
I prefer to leave in a flat which is not made of wood or paper walls. As a tenant often I had problems hearing other people's TVs or private conversations which resulted in wasting quite some time trying to relocate.
Is there any way I could say about the construction from the external look or shape, age or any other way.
I think I have noticed a correlation that houses which have a flat roof, tend to be made of cement rather than wood. Any commends?
many thanks!
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polar wrote:

Concrete is more sound resistant than wood, but even in concrete construction of apartments the dividing walls are usually not made of concrete. And certainly, wood-frame construction can be made to be sound proof.
If all you're concerned about is sound, just find some other way to determine how quiet a structure is. It's impossible to tell form the outside just by looking.
--
(||) Nehmo (||)


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