Old 03-10-2011, 09:38 PM
Join Date: Mar 2011
Location: Arizona
Posts: 4
Default Insulating Concrete Hearth

Does anyone know how long you need to let the perlite/portland cement mix for the insulating hearth set up before starting to build the oven on top of it?
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Old 03-10-2011, 10:34 PM
Il Pizzaiolo
Join Date: Jan 2007
Location: Tampa, FL
Posts: 1,446
Default Re: Insulating Concrete Hearth

I waited 1 week. It takes at least 4-5 days before it feels like it can handle the weight and abuse of climbing around on it to build the dome.

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Old 03-11-2011, 04:32 AM
Join Date: Mar 2011
Location: Arizona
Posts: 4
Default Re: Insulating Concrete Hearth

Thanks for the info. I'm building the form for the hearth this afternoon after work, going to make the pour tomorrow, then I have next week off. I'm hoping to get a lot done!
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hearth, insulating hearth

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