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Post by Vortex on Jan 29, 2018 11:08:20 GMT -8
Well done, nice work.
People often cone the top of the riser like that to stop fly ash building up there.
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Post by flybyjohn on Jan 29, 2018 11:11:42 GMT -8
That's good about the cone then, an accidental success.
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Post by flybyjohn on Feb 1, 2018 11:21:26 GMT -8
I poured the concrete bed over the base bricks and then flipped them over. I now have a nice flat surface to start my firebox sides.
The perlite on the sides of the riser sections were beginning to fall out as the clay dried so I found that a mixture of 1 part fireclay and 2 part silica sand made a nice stucco type mortar that did not shrink much when it dried out. I put it on over the outside of the riser sections where the perlite was exposed. it seems to be holding together well right now.
I might need to add some cement of some sort into my mortar because it seems to stick the firebrick together good when wet but after it is all dried out the bricks just fall apart. I soaked the bricks in water for about 20-30 seconds each before putting the mortar on them. Is there something I am doing wrong here?
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Post by Vortex on Feb 1, 2018 13:39:51 GMT -8
Are you not going to be vibrating the firebox casts to get the air bubbles out? It would be difficult on top of bricks.
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Post by flybyjohn on Feb 1, 2018 15:36:44 GMT -8
The firebox is just going to be firebricks mortared together. See the plans drawings on page 2. The riser section is the only thing I made forms for and they weren’t really cast I guess, more like tamped into the form. I have been thinking that if the firebox needs more insulation, I can weld some thin steel sheets to my metal sled and fill the 1 inch gap with perlite or vermiculite.
How long does mortar need to setup before lighting a fire inside it?
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