#1  
Old 04-17-2009, 04:58 AM
Serf
 
Join Date: Sep 2008
Location: brisbane
Posts: 11
Default hearth slab how long

Hi all just poured the slab that i will put my fire bricks on and i used vermiculite for the top part its been 4 hours and it has not set. how long does it take. i am feeling very sad at the moment started work early so i could get into it and well friday night is not going to well.

P.S am i going to have to dig it out any info would be great will i sleep well
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Old 04-17-2009, 09:15 PM
MK1 MK1 is offline
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Join Date: Mar 2009
Location: Nottingham
Posts: 123
Default Re: hearth slab how long

I've heard it can take a couple days to fully cure and even then the stuff is spongy like cork. What was your cement to vermiculite ratio?

Mark
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Old 04-17-2009, 09:43 PM
Serf
 
Join Date: Sep 2008
Location: brisbane
Posts: 11
Default Re: hearth slab how long

Thanks for that MK1 it seems to be getting better now 24 hrs later i am glad you said about the being like cork.

P.s wish i had have known that. i did not sleep last night stressing about what i did wrong. My mix was 5-1.

I wonder why the whole lot will not crack once i have finished it if its going to be like cork.

Thanks all
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Old 04-18-2009, 04:35 AM
MK1 MK1 is offline
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Join Date: Mar 2009
Location: Nottingham
Posts: 123
Default Re: hearth slab how long

Base,
Some people (experienced) use even less portland cement, so yours will bear the weight. Don't get on it too soon. I'm just now pouring the hearth slab today so I've never used it, but your question has come up many times and I've read about half of everything on this forum. Do a search.
I have investigated the design James and help has put forth. It is very well thought out, and better yet field tested. We owe them.

Mark
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Old 04-18-2009, 09:39 AM
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Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: hearth slab how long

Keep it damp for at least 7 days.
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