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Gas forge cement popped off - Heellppp

Jonas Liebel

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Hi there,

I wanted to use my propane tank gas forge for the first time and started to slowly heat it up, but apparently I didn't let the cement dry long enough, resulting in a loud "bang", a huge flame and a hole in my cement walling. 

First of all, do you think the big flame that shot out of both ends of the forge was caused by the cement coming off or the other way round?

Second, how do I fix the holes? Should I just put some new cement into them and hope that everything bonds together nicely? 

I'm a little bit lost, so any help would be greatly appreciated :(:unsure:




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You're fine.  :lol:  Lightly dampen the surface and patch it with more cement.  Sometimes you can then light the forge immediately using the minimal amount of heat, but since you already had one steam explosion I'd let it cure for at least a week, or even better, if you have a low-power incandescent light bulb or other source of gentle heat, put that bulb in the forge and turn it on, and leave it on for 24 hours or so. 

The flames coming out may or may not be an issue.  Some flame is normal, and if you've never used gas before it can be scary.  A LOT of flame coming out means you have too much fuel or too little air.  What kind of burner are you using? 

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Having once tried to light one of my forges without checking to make sure that I had the blower hose attached to it rather than my other forge I would go with Alan and say that it was the fuel air mixture that caused the gas to ignite with a bang and a ball of fire.


HELP...I'm a twenty year old trapped in the body of an old man!!!

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Looking at the position of the damage, being directly opposite the burner opening I'm going to hazard a guess that two seperate things happened. Trapped steam caused the liningto crack and pop off and the first-time lighting experience created the "Whooompf" effect.

Seperate issues. Patch as per Alan's post and roll on. No harm, no foul.

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Yup, a good pop from spalling will definitely make fer a bung pucker moment, and as Al pointed out patching is easy enough......:D

If ya can't be good don't git caught  !!                                        People who say stuff can't be done need to

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And I will show you a good man to listen to ......

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Fun fact: the Romans used to mine for gold in a similar fashion. They would make the slaves light a fire at the base of a rock wall. When the rock got hot, they'd pitch water onto it and BOOM! 

This is why wet river rocks will explode if heated too quickly. In other words, get the clay dry before you heat it too quickly. 

Edited by Zeb Camper
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1 hour ago, Jerrod Miller said:

Actually, it is a thermal expansion and contraction issue that the Romans used and why river rock explodes.  The forge lining is a steam build up issue.  

Oops :wacko:. I figured the trapped moisture in wet river rocks would be the thing that causes them to blow up, just because dry rocks won't explode. I wasn't sure about the Roman thing though, thermal expansion/contraction does make more sense.

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