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Old 02-03-2009, 01:10 PM   #1
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Firepit Question


After many days or research I finally built my own firepit on my patio. I have an extended concrete patio so I decided to build on top of the slab and there is where my question is. I built the structure out of brick and flagstone. I stacked the bricks soldier style in a circle and capped off the top and exterior with flagstone. I also inserted a steel pipe for drainage. (attached picture)

Well, we made a small fire this last weekend and after about an hour later there were 2 loud pops and some concrete blew upward. After I extinguished the fire I notice a small pit of concrete missing from the slab (nothing blew from my structure).

Is it possible that there was some small air pockets in the original slab laid by the home builder or could the lighter fluid have leaked into the concrete pores and blew?

Yesterday, without anyone around I made a rather large bonfire to see if it would happen again and nothing happened?

Should I be worried to use it again???
Thanks.
cp
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Old 02-03-2009, 04:15 PM   #2
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Firepit Question


Quote:
Quote:
Originally Posted by phxccw
I built a firepit on on existing concrete and it popped after one fire...could I lay firebrick on the bottom of the pit to protect???

Ayuh,..

I have a Firepit, which is merely a big steel Ring, 3/8" thick, 3' 6" diameter,+ about 15" tall....
Kinda like a heavy piece of pipe, lain on end...

I have nothing But a concrete patio where it's at,...
I took a bunch of chimney bricks from a recent tear-down,+ layed them out flat, all sides just touching, in a pattern that's slightly larger in daimeter than the steel ring,..
I then have 4 more of these bricks to hold the steel ring 2" off the bricks for draft...
These are just plain ole Junk Bricks,...

Over the last 3 years, I've moved this assembley around the patio several times to several places,...
Other than replacing a few of the Bricks every now,+ then,...
I've had No stains, No spadling, just No Sign of where it's been used....
During this time,...
I've burnt Most of a 100' Poplar tree that I had cut down...
That's Alota Fires,.. Hot fires too....
I just posted this up in the thread you hi-jacked in the General Topics forum...

After seeing your picture here,...

If you leave a blanket of Ashes, or Sand in the bottom of the pit,...
You'll be Fine...
That's Why it didn't happen the 2nd fire you had,...
I assume the ashes from the 1st fire were still there,...

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Old 02-03-2009, 04:36 PM   #3
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Firepit Question


So do you think it will be a waste to set some firebricks at the bottom? I'm just paranoid with company being around it and all.


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Originally Posted by Bondo View Post
I just posted this up in the thread you hi-jacked in the General Topics forum...

After seeing your picture here,...

If you leave a blanket of Ashes, or Sand in the bottom of the pit,...
You'll be Fine...
That's Why it didn't happen the 2nd fire you had,...
I assume the ashes from the 1st fire were still there,...
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Old 02-03-2009, 05:45 PM   #4
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Firepit Question


Quote:
So do you think it will be a waste to set some firebricks at the bottom? I'm just paranoid with company being around it and all.
Ayuh,....

Plain ole red building Bricks will work just Fine,... No need for Firebrick....

Actually,...
A fire bed of Sand, or Ashes, oh, say 2" to 4" is about Ideal........
With, or Without the Bricks....

The only thing I can see in your picture that I would do Differently is,...
You don't have any place for a Draft, down Low....

I don't see the pipe you mentioned,+ you don't say it's diameter,...

I'd probably would lay in 6 or 8 pieces of 4" pipe, on the slab,+ built over them...
The free flowing Up-draft helps with the swirling smoke....
Same as when I have to add a few bricks to hold my fire-ring up off the brick bed...

More Draft, Cleaner Fire....

Looks Great,....

Last edited by Bondo; 02-03-2009 at 05:49 PM.
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