#11  
Old 09-05-2013, 05:39 AM
Peasant
 
Join Date: Sep 2012
Location: ohio
Posts: 42
Default Re: Is cracking of Block normal? Pict

Just a follow up to this situation. I dug out around the foundation and there is no failure.

The foundation consists of the following: 5" chips and dust compatced, 5" concrete with rebar, 2 layers of CMU filled with concrete to bring the height up to the patio.

The cracks stop at the bottom layer of the actual oven. There are no cracks or failure in the CMU or poured base.

My theory is that the cracks in the walls could be caused by building hot fires (its a large fireplace) during cold months whild there is water in the wall. That's the only thing i can figure.

The interior of the fireplace is lined with splits and doesn't offer much insluation to protect the CMUs (which are filled with rebar and concrete).

I am planning on adding a layer of full brick firebricks to the interior to provide some protection to the CMUs.

Any input or advise? Has anyone seen this before with underprotected walls?

Thanks
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  #12  
Old 09-05-2013, 06:02 AM
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Il Pizzaiolo
 
Join Date: Jun 2007
Location: South Carolina,USA
Posts: 1,923
Default Re: Is cracking of Block normal? Pict

Quote:
Originally Posted by caspian View Post
Just a follow up to this situation. I dug out around the foundation and there is no failure.

The foundation consists of the following: 5" chips and dust compatced, 5" concrete with rebar, 2 layers of CMU filled with concrete to bring the height up to the patio.

The cracks stop at the bottom layer of the actual oven. There are no cracks or failure in the CMU or poured base.

My theory is that the cracks in the walls could be caused by building hot fires (its a large fireplace) during cold months whild there is water in the wall. That's the only thing i can figure.

The interior of the fireplace is lined with splits and doesn't offer much insluation to protect the CMUs (which are filled with rebar and concrete).

I am planning on adding a layer of full brick firebricks to the interior to provide some protection to the CMUs.

Any input or advise? Has anyone seen this before with underprotected walls?

Thanks
Yup, I have.....when ever the firebrick is directly bonded to the cmu. Usually there is a air space...a thermal break, especially on outdoor fireplaces.

I would remove the splits and build a new box with full size FB, leaving a 1" gap between the cmu and the FB.

Then you should work on getting some weather protection on the cmu before winter comes. Once you get cracks the damage will get worse faster. If you don't have time for anything permanent, then coat it with Thoroseal at least.
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  #13  
Old 09-05-2013, 07:16 AM
Peasant
 
Join Date: Sep 2012
Location: ohio
Posts: 42
Default Re: Is cracking of Block normal? Pict

Thanks for the advise. I will patch the cracks and seal it with Thoroseal.

Should I fill the 1" void with vermiculite or just leave it open? I am guessing open is better in case water gets in there through the chimney.
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  #14  
Old 09-05-2013, 08:01 AM
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Default Re: Is cracking of Block normal? Pict

Open or loose perlite/ vermiculite.
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  #15  
Old 09-05-2013, 08:18 AM
Peasant
 
Join Date: Sep 2012
Location: ohio
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Default Re: Is cracking of Block normal? Pict

Will this work just as well to get me through the winter? Price seems better and this project is draining me.

Heavy Duty Waterproofing Base Coat at Menards

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  #16  
Old 09-05-2013, 08:30 AM
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Default Re: Is cracking of Block normal? Pict

Can't say, I have never used that product. You can get a 5 gal bucket of powder thoroseal for 30-50$.
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