In one of the "Ask This Old House" TV show, Tom helped a guy to level a
concrete floor which was not even in this way:
- Find a 2x4 wood board that is straight.
- Put the 2x4 on top of the highest spot of the floor.
- Level the 2x4.
- Scribe on the 2x4 to transfer the ups and downs of the floor on the
- Use a power tool to cut the 2x4 along the scribed line.
- Put the 2x4 back on the floor to exactly where it was. This time the
2x4 should be flat on the floor with its top side becomes level.
- Do the same thing on another 2x4 and put it parallel to the first
2x4. (I guess the distance between them depending on how large the
floor is). These two 2x4 form a dam.
- Pour leveling compound into the dam.
- Put another straight wood over those two 2x4, and squeeze the
leveling compound in order to level it.
I really like this technique. My question is: What should we do with
those two 2x4? Should we leave them on the floor? Should we remove them
when the leveling compound is stiff enough? I would assume we want to
remove them. But the problem is that if we remove them, we would lose
the level surface when we try to level the area adjacent to the first
area. But if we don't remove them, I am afraid that they may become
This makes sense. This means that we will need to do a very good job in
leveling and smoothing the surface of the first area. Otherwise, any
unevenness in the first area will show itself in the adjacent second
area. This is probably still OK if we are going to put ceramic tiles
over the area.
Thanks for the info.
Really. Somehow, I didn't remember that they did that. You are
probably right. They needed to have a way to secure the woods in place
before they could pour the leveling compound into the dam; otherwise,
the leveling compound would burst the dam. Now, I think about this; I
seem to vaguely recall that they really glue the wood onto the floor.
But I seem to remember that the wood didn't have the greenish pressure
treated wood look. The wood just like a regular wood.
Yes, you are right. Tom indeed fastened the wood shrims on the
concrete floor. As I mentioned in my last post, I vaguely recalled
that Tom used adhensive to glue the wood shrims. I "seemed" to recall
that he said the adhensive was marine-grade and very high quality or
I surely hope that those wood shrims can withstand moisture because
that concrete floor is either right at the ground level or slightly
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