Re: The lighter-weight firebricks used in kilns are they used a insulation?

Posted by Rado (144.134.145.235)

In Reply to: The lighter-weight firebricks used in kilns are they used a insulation? posted by Bob Bourne

Bob,
You could use these to insulate the oven on sides and top. If building only one oven they can be broken to fragments with hammer and poured on top in boxed in oven. Light weight bricks have higher density comparing with vermiculite (in insulation sense they absorb more heat than vermiculite, as their purpose is to last in glowy red hot temps in kilns or be in contact with el. power spiral heating elements, they are not insulation only kilns made of these bricks are still insulated on outside with efficient material.) Even though they are not commonly used in traditional wood fired ovens, ones you have them why not to use them. I haven't seen your slab how you have it with the layer of firebricks (the other heavy/dense type) put flat onto the slab. Structurally and efficient, insulating bricks could be great at the bottom under the slab especially when the slab is thinner and with thinner hot face layer on top when the whole floor gets hotter. r

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Re: The lighter-weight firebricks used in kilns are they used a insulation?