#11  
Old 02-25-2012, 03:52 AM
david s's Avatar
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Location: Townsville, Nth Queensland,Australia
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Default Re: Homemade Perlite Board.. and Door

The problem with Plaster of Paris is that it holds moisture really well. It will still hold together when wet but if there is a substantial amount it will turn to steam really suddenly and blow it apart. Wet plaster takes about a week to dry out.
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  #12  
Old 02-26-2012, 06:35 AM
fornax hominus's Avatar
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Location: ottawa valley canada
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Default Re: Homemade Perlite Board.. and Door

I built mine just like yours, 1'' of ceramic fibre, 2 1/2 '' of vermicrete with aluminum sheet surround bolted through to a wood exterior .. 2 years on [100+ heats] , all is well . I have staining around the bolt heads as they are the thermal conduit ... they sure get hot! but nothing else.. it is a bit heavy but I put 2 large wooden handles on so you can get a balanced grip.
I did attach a heavy woodstove gasket around the perimeter to finish the seal ..gasket glue would not hold on the wood, so I ended up holding it in place with construction staples.
happy cooking!
tim
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