Dear on basement floor

[ambly]

Hello,

I am in the process of remodeling the basement and have now ripped up an old plank floor.
Under this, they had laid tar and then paper before framing the floor above.

I am going to tile the floor, so my question is how much of the tar needs to be removed?

 

[ktm250]

Everything. Tar is an oil product that makes, basically, nothing stick to it.

 

[ambly]

How do I get rid of it the easiest/cheapest way?

Do I have to rent a giant machine for that then?

 

[ktm250]

Concrete grinder usually takes care of most things.

 

[moddha]

...available in all possible sizes, from small handheld to large ones like lawnmowers.

 

[Alko]

Tar dear, sounds tough.

Maybe an idea to try one of those vibrating scrapers that Festool has, which can handle some of it before using the router. Depending on how large the area is, of course.

 

[mattiasp]

No, it's not tar, but asphalt or actually Bitumen. Tar is obtained when you dry distill wood, and Bitumen is an oil product. Everything has to be removed anyway. I had the same problem in my bathroom. I rented a machine that milled away the asphalt in half an hour. The edges I had to take with a remediation milling machine that I also rented. I actually have pictures of the machines. I also rented a dust separator.