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How to tell level-ness of concrete floor

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How to tell level-ness of concrete floor mattmeitzner 10-11-2007
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Posted by on October 11, 2007, 4:41 pm
Okay, I know this is probably a stupid question with an obvious
answer, but...How do I tell if my concrete basement floor is level or
not? It's not so bad that it's obviously wavy, but I don't want to
plan on finishing the basement with an engineered wood floor only to
find out that it's slightly out of level. I've heard as little as 10
mm over a 3m length will cause problems, but I am not sure how to
detect this amount of dip or rise. Thanks for any help!


Posted by mm on October 11, 2007, 5:22 am
On Thu, 11 Oct 2007 13:41:43 -0700, mattmeitzner@gmail.com wrote:

>Okay, I know this is probably a stupid question with an obvious
>answer, but...How do I tell if my concrete basement floor is level or
>not? It's not so bad that it's obviously wavy, but I don't want to
>plan on finishing the basement with an engineered wood floor only to
>find out that it's slightly out of level. I've heard as little as 10
>mm over a 3m length will cause problems, but I am not sure how to
>detect this amount of dip or rise. Thanks for any help!

Level or flat?

For level, fill the room full of water and measure the depth at
different places.

For flat use a long straight edge that you have verified is straight
by putting it against something else that is flat.

Posted by clot on October 11, 2007, 6:41 pm
mm wrote:
> On Thu, 11 Oct 2007 13:41:43 -0700, mattmeitzner@gmail.com wrote:
>
>> Okay, I know this is probably a stupid question with an obvious
>> answer, but...How do I tell if my concrete basement floor is level or
>> not? It's not so bad that it's obviously wavy, but I don't want to
>> plan on finishing the basement with an engineered wood floor only to
>> find out that it's slightly out of level. I've heard as little as 10
>> mm over a 3m length will cause problems, but I am not sure how to
>> detect this amount of dip or rise. Thanks for any help!
>
> Level or flat?
>
> For level, fill the room full of water and measure the depth at
> different places.
>
> For flat use a long straight edge that you have verified is straight
> by putting it against something else that is flat.

Yup, hence my post.


Posted by clot on October 11, 2007, 4:45 pm
mattmeitzner@gmail.com wrote:
> Okay, I know this is probably a stupid question with an obvious
> answer, but...How do I tell if my concrete basement floor is level or
> not? It's not so bad that it's obviously wavy, but I don't want to
> plan on finishing the basement with an engineered wood floor only to
> find out that it's slightly out of level. I've heard as little as 10
> mm over a 3m length will cause problems, but I am not sure how to
> detect this amount of dip or rise. Thanks for any help!

Lay a bit of steel angle iron over the surface and observe?

Posted by clot on October 11, 2007, 4:47 pm
clot wrote:
> mattmeitzner@gmail.com wrote:
>> Okay, I know this is probably a stupid question with an obvious
>> answer, but...How do I tell if my concrete basement floor is level or
>> not? It's not so bad that it's obviously wavy, but I don't want to
>> plan on finishing the basement with an engineered wood floor only to
>> find out that it's slightly out of level. I've heard as little as 10
>> mm over a 3m length will cause problems, but I am not sure how to
>> detect this amount of dip or rise. Thanks for any help!
>
> Lay a bit of steel angle iron over the surface and observe?

Sorry, should have added "and put a spirit level on it?"


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