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Old 08-26-2010, 10:52 PM
Serf
 
Join Date: Mar 2007
Location: Arizona
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Default Hearth build up / strength question

Ok, I'm totally a newbie on this and am learning as I go. I have built my stand (a corner model) for an angled 42" oven. I poured the concrete slab for the hearth base and then the perlite/portland cement mix to the specs outlined in the plans. The perlite mix goes right to the edges of the hearth.

My question is this: Given the structural limitations of the perlite/portland mix, what are my options for putting a finishing layer on the hearth to protect against moisture, or alternatively, can I build up walls and a roof on top of the hearth? Will the perlite/portland mix hold up with the weight?

In retrospect, I probably should have formed it off to limit the perlite to just beyond the perimeter of the dome, but it is too late for that.

Any thoughts sincerely appreciated.
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Old 08-27-2010, 09:59 AM
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Default Re: Hearth build up / strength question

It is easy enough to remove the perlcrete from the area where your walls will be, and that is what you will need to do.
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Old 08-31-2010, 07:17 AM
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Default Re: Hearth build up / strength question

Thank you for asking this question! We did the same thing, but ran short of the perlite/concrete mix.

Tscarborough, do you mean we'll need to chip off any perlite mix that does not go right under the dome? Many thanks in advance, Heather in Pittsburgh
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Old 08-31-2010, 04:50 PM
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Default Re: Hearth build up / strength question

Yes. Cut back the perlite to just short of the dome. If not, and depending on your finish, this layer could be a constant source of water entry.

The way to thing of this is to draw a circle - this is the inside of the oven. Draw a circle around that - this is the brick and hearth brick, the thermal mass. Another circle around that - this is the insulation. Another circle around that- this is the support slab and finish/cladding.

Last edited by Neil2; 08-31-2010 at 04:56 PM.
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Old 08-31-2010, 06:10 PM
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Join Date: Jul 2010
Location: Pittsburgh
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Default Re: Hearth build up / strength question

Just one more question. If we are going to put a layer of tile on top of the perlite level, would we still need to cut it back? Would we be better served to do so anyway?

Many thanks!

Heather
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