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Old 10-31-2010, 01:00 PM   #1
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Cracks in fire pit


I have built an outdoor fire pit/fireplace and it does great but I have two cracks in mortar joints that naturally tend to expand after heating up almost like expansion joint.
How can I repair/fix this? Iíve tried to repair with fireplace mortar but as the fire heats up it reappears.
Suggestions appreciated!
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Old 10-31-2010, 02:05 PM   #2
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Are you using fire brick? or regular stone/rock?
The mortar can only do so much expansion by itself.
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Old 10-31-2010, 02:12 PM   #3
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Fire brick in the base, 4" concrete block for the sides.
it's cracking along the mortar joint though.
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Old 10-31-2010, 03:28 PM   #4
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You are dealing with a differential co-efficient of expansion in the joint between various products an unless you can change to entirely firebrick, I'm thinking the problem won't go away.
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Old 10-31-2010, 08:51 PM   #5
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Anything in contact with direct flame or temps higher than 500 degrees needs to be lined with firebrick laid with refractory cement. It won't be long before the CMU begin to crack and spall.
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Old 11-01-2010, 01:26 AM   #6
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don't pay attn to the previous posters,,, what you need to do is build MUCH smaller fires then the block won't get hot,,, did you ever hear of fireplaces built from river rock exploding ? 1 of the things i remember from boy scout days amazing how much information was included in that little handbook & the merit badge pamphlets,,, guess those who play little league baseball, soccer, football, etc have as much ' real life ' information to get them thru life

of course listen to them - just had to get my $.03 into the thread,,, many changes have taken place in our culture at the rate is geometric
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Old 11-01-2010, 08:58 AM   #7
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Quote:
How can I repair/fix this?
Ayuh,... How about just leaving it be, 'n callin' it drainage....
It ain't like the fire is gonna drain out thru it...but the rainwater will...
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