#1  
Old 12-26-2008, 02:04 AM
Serf
 
Join Date: Dec 2008
Location: Perth WA Australia
Posts: 1
Question Pouring the hearth

Just about to start construction and have a queary on the hearth. I thought about building the stand 5 blocks high and using the top row of blocks as the formwork for the structual and insulating hearth. I would lay 4 courses, put down a fibre cement sheet then put the last course on top. The reo bar would tie it all together and keep it stable. Could i then just use reo mesh in the 2 slabs for strength???
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Old 12-26-2008, 04:19 PM
Journeyman
 
Join Date: Aug 2008
Location: San Diego
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Default Re: Pouring the hearth

Barnsey, That is kind of what I did. It worked out well for me. Good luck.

Mark
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Old 12-15-2009, 06:59 PM
Serf
 
Join Date: Nov 2009
Location: Adelaide, Australia
Posts: 5
Default Re: Pouring the hearth

Hi Barnesy,
I was thinking about using the same method. Four bricks high and placing an 18mm compressed fibre cement sheeting between the fourth and fifth block then pouring in the concrete.

Just wanted to know how you went with this.
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Old 12-16-2009, 03:43 AM
Il Pizzaiolo
 
Join Date: Mar 2009
Location: USA
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Default Re: Pouring the hearth

thats pretty much what i did as well,, see pics

Cheers
Mark

Last edited by ThisOldGarageNJ; 08-16-2010 at 05:53 PM.
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Old 12-16-2009, 01:56 PM
Serf
 
Join Date: Nov 2009
Location: Adelaide, Australia
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Default Re: Pouring the hearth

Thatís a little different to what Iím thinking. It appears that you set the formwork above the last layer of bricks.

What Iím thinking of doing is adding one more layer of bricks to act as the form work.
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Old 12-16-2009, 04:06 PM
Master Builder
 
Join Date: Jul 2009
Location: Los Angeles
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Default Re: Pouring the hearth

For added security if I were doing something like this I would use narrower blocks (8x6x16) as the top formwork course so the entire slab perimeter would rest partly on the wider (8x8x16) blocks beneath.
But I guess with enough rebars extending into the blocks themselves, that's more than adequate.

Last edited by fxpose; 12-16-2009 at 04:11 PM.
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Old 12-16-2009, 04:19 PM
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Location: Vancouver Island
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Default Re: Pouring the hearth

I agree with fxpose.

Unless your suspended structural slab is supported on the wall (2 inches should do it) it will shear at the wall face.
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Old 12-16-2009, 04:55 PM
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Join Date: Nov 2009
Location: Adelaide, Australia
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Default Re: Pouring the hearth

Just what I was thinking guys. First four layers of 390x190x190 Besser blocks then on the Fifth Formwork layer a 390 x 90 x 190 block. That’s 100mm of overlay on the slab.

The other option was to use decomposed granite instead of concrete, level, and then place 2” Calcium silica board then fire bricks on top. Might save some time.
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