#11  
Old 04-14-2010, 09:23 PM
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Default Re: Fire Brick Size?

More great pictures. Thanks

Is this order correct:

Block stand
30X30 slabs--concrete?
Perlite/concrete insulation layer?
Thin layer of mortar to set firebricks
oven floor

I have seen a few designs that have an isulating layer recessed in the top cavity between the blocks, a layer of cement that spans the blocks and then oven floor.

I am about to get serious but I am still looking for fireclay to make my own homebrew. So far $29.00 to ship a $15 dollar bag,50 lbs.

Derk
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  #12  
Old 04-14-2010, 09:48 PM
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Default Re: Fire Brick Size?

Have you googled masonry suppliers for your area?

Yes, I had some old 30x30x2 inch pads I used instead of placing a slab, then 4" of perlcrete, a mortar leveling bed, then the floor.
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Old 04-14-2010, 10:07 PM
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Default Re: Fire Brick Size?

I have found a few ceramic/pottery places I am going to try tomorrow. There seems to be different types of fireclay. Is your percrete pad sturdy? Hold the weight well ? Compress? There seems to be many approaces to slab, insulation, floor percrete combinations.
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  #14  
Old 04-14-2010, 10:14 PM
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Default Re: Fire Brick Size?

Ceramic/pottery places around here charge $9.50 for a firebrick while the masonry supply houses charge a buck fifty for the identical unit.

The compressive strength of 8-1 or even 12-1 is more than adequate for this application. There are many ways to skin the cat, but the purpose is to build a thermal mass, highly insulated.
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  #15  
Old 04-15-2010, 01:40 PM
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Default Re: Fire Brick Size?

Tom,

What was the recipe for your home-brew fireclay mortar? there seems to be many skinned cat ideas on this also.
I have found fireclay (dry) here in Salt Lake. It is about $16.00 per 55lb but no shipping.

Derk
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Old 04-15-2010, 03:06 PM
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Default Re: Fire Brick Size?

Sand, lime, fireclay, cement, 3:1:1:1 for the brick seems to be best (I used pre-mixed), and a little different for the area around the flue.
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  #17  
Old 04-15-2010, 04:56 PM
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Default Re: Fire Brick Size?

I ordered one bag of refmix from a retailer in CA and now have a fireclay supplier in SL so I will use the Refmix for the joints on the arch, fireclay and sand for oven floor bed and your mix for flue? and odds and ends.

Derk
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  #18  
Old 04-15-2010, 04:57 PM
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Default Re: Fire Brick Size?

Sorry,
Which pre-mix did you use?
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Old 04-15-2010, 07:22 PM
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Default Re: Fire Brick Size?

Able Refractory cement out of Houston. It is an air-set water soluble, not recommended for exterior use.
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