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I am using concrete bricks for an outdoor fireplace base. The concrete slopes downhill. Can I use cement patch to raise it 1/2" over 5' x 30 " span?

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  • Will the concrete bricks sit on a concrete slab that slopes downhill? Will they sit directly on dirt? Do you need to raise it 1/2" over a 5' span or over a 30" span? Please edit your question to clarify these details.
    – FreeMan
    Jun 20, 2022 at 18:06
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    How long would you like it to look good for, 1/2/5/10/25 years? If 1 or 2 years yes. Anything else it is easier (cheaper if your time has value) to pour a thicker slab than do the prep work required to make concrete patch stable in a 1/2" lift over a decent period of time. Jun 20, 2022 at 22:14

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Solution 1:

Use diamond saw and cut the concrete block in an angle, so they sit straight.

Solution 2:

Build a concrete platform to level the bricks.

A cement patch 1/2 inch thick over 5 foot long sitting on a plain dirt/ground wont last a day.

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