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Old 01-25-2011, 05:59 PM   #1
Join Date: Apr 2009
Location: Quebec Canada
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Oops -- help!


I spent a whole day, mixing concrete, pouring, smoothing out and mixing some more. I've been filling in trenches where I have installed a new drain, waste, vent system -- about 40 feet in length in total.

Now, I was very careful to mix well with (about) a 6 inch slump (sort of average.) I filled the trenches and gave it as much of a crown as surface tension would allow. It creamed up nicely but as soon as the moisture was absorbed, it shrank below the surface of the floor by as much as 1/16th inch. For half of the trench, it will be hidden by a floor or a wall. the other half will be painted and this is where I'm having problems.

How can I level out the pour? Can I use thinset or some other self leveling thin mix? Any other suggestions?


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Old 01-25-2011, 06:57 PM   #2
Join Date: Oct 2008
Location: Ontario
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Originally Posted by Allthunbs View Post
I spent a whole day, mixing concrete, pouring, smoothing out and mixing some more.
Hard work, aint it ??

Sorry, I couldn't resist.
I put a thin layer of concrete to smooth out some rough steps. Its been 3 or 4 years now, outdoors, and its holding up fine. No flaking at all. Probably helped that the base material was rough. I don't recall exactly what product it was, but I think it was from Rona, and was intended to be used thin. Pretty sure I used the white adhesion promter too (not sure what the proper name is, I call it milk).


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