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Old 08-10-2013, 11:38 AM
Peasant
 
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Location: ohio
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Default Is cracking of Block normal? Pict

I ran out of time last year and only built my fireplace (didn't face it with stone). This year I'm working on the pizza oven, so facing will take place next year. I noticed cracking of the block. All voids were filled with concrete and rebar, but I'm not thrilled to see the cracking. I'm guessing it is from last winters freeze/thaw. Is this something to worry about, or common due to the nature of the build?

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Old 08-10-2013, 11:53 AM
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Default Re: Is cracking of Block normal? Pict

Normally, when cracks travel through a block like that it is not normal, it is indicative of foundation failure. Normal shrinkage cracks stair-step the joints.
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Old 08-10-2013, 12:03 PM
Peasant
 
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Location: ohio
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Default Re: Is cracking of Block normal? Pict

I have cracks in the same location on the other side of the fireplace. Am I totally screwed? I have about a 5" base of concrete with rebar. It is on top of a few inches of chips and dust compacted. On top of the pad I put 2 layers of concrete block filled it with concrete. Total base thickness is 21" concrete/concrete block with concrete.

Will it find a spot and stop? Ugggg. This is not in a location where I can easily get a bobcat to redo.
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Old 08-10-2013, 12:06 PM
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Default Re: Is cracking of Block normal? Pict

It appears that the slab (assuming that is what we see at the bottom of that pic) has a substantial crack in it.
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Old 08-10-2013, 12:07 PM
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Default Re: Is cracking of Block normal? Pict

How big is the fireplace, do you have an overall pic?
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Old 08-10-2013, 12:18 PM
Peasant
 
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Location: ohio
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Default Re: Is cracking of Block normal? Pict

It's huge. The grate is 4' wide.
So I should dig to the sides of the foundation and look for cracks. If (hopefully) there are none, I repackage and top off with rock to prevent erosion. If there is a crack in the foundation, what do I do?

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Old 08-10-2013, 12:23 PM
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Default Re: Is cracking of Block normal? Pict

Best case scenario, it settles and you can proceed. Worst case, it will continue to move and mirror through you finish materials and eventually fail. If compaction was done correctly on the base and sub-base, you will probably be OK.
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Old 08-10-2013, 12:28 PM
Peasant
 
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Default Re: Is cracking of Block normal? Pict

This was my first time and in hindsight would
Have done a thicker layer of chips and dust and thicker pad. That is water under the bridge. I had no idea how much this thing would weigh.

I can only hope the structure of the fireplace will aid in minimizing distortion. The excessive rebar and concrete through the blocks may help it.

Thanks for your insight. Hopefully someone planning a build will so 200% on the base and not redo my mistake.
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Old 08-10-2013, 02:38 PM
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Default Re: Is cracking of Block normal? Pict

It appears that it is leaning to the left - it that just the picture?
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Old 08-10-2013, 04:03 PM
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Default Re: Is cracking of Block normal? Pict

If it gets worse, I might consider calling one of those companies that pump a cement type mixture under you slab to level it....It works on house foundations......
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