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barnesy 12-26-2008 02:04 AM

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???

exceloven 12-26-2008 04:19 PM

Re: Pouring the hearth
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Barnsey, That is kind of what I did. It worked out well for me. Good luck.


fil-ski 12-15-2009 06:59 PM

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.

ThisOldGarageNJ 12-16-2009 03:43 AM

Re: Pouring the hearth
thats pretty much what i did as well,, see pics


fil-ski 12-16-2009 01:56 PM

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.

fxpose 12-16-2009 04:06 PM

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.

Neil2 12-16-2009 04:19 PM

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.

fil-ski 12-16-2009 04:55 PM

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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