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  #1  
Old 06-03-2011, 02:19 PM
Serf
 
Join Date: May 2011
Location: california
Posts: 7
Default Oven base installation on existing (uneven) patio

Hi all,

I'm new to the forum and just beginning my pizza oven installation (process).

Question for you all: I would like to install the oven (42") internal width on an existing patio adjacent to an existing BBQ island. The existing patio is 1 inch sandstone mortered in place on top of 3 inches of rebar reinforced concrete (correctly installed) both are installed at an approx: 5 degree angle to drain water away from the house. [See attached photos]

I would like to install the base of the oven as depicted however need a suggestion for how I should treat the existing concrete and sandstone base. Should I remove the sandstone and install a further 2 inches of concrete on top of the existing concrete and plumb to level for the pizza oven? Any suggestions?

Thanks, Steve
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Oven base installation on existing (uneven) patio-photo1.jpg   Oven base installation on existing (uneven) patio-photo4.jpg   Oven base installation on existing (uneven) patio-photo5.jpg  
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  #2  
Old 06-03-2011, 03:52 PM
GianniFocaccia's Avatar
Il Pizzaiolo
 
Join Date: Jun 2009
Location: Disneyland, CA
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Default Re: Oven base installation on existing (uneven) patio

If it were me, I'd leave that great-looking sandstone in place and gradually make up the 5degree slope with mortar between courses. Once the cores are filled you're good to go.
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Old 06-03-2011, 05:07 PM
BriggsARNP's Avatar
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Join Date: Apr 2011
Location: Pasco Wa
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Default Re: Oven base installation on existing (uneven) patio

I agree. I don't think that the sandstone will have any problems supporting the oven if it is already on a solid concrete base.
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Old 06-04-2011, 06:33 AM
Apprentice
 
Join Date: Jan 2011
Location: Perth, Wesern Australia
Posts: 178
Default Re: Oven base installation on existing (uneven) patio

Agreed with above..

In regards to the level.. either level it from the first block.. or once you poor the reinforced concrete top.. correct the level there..?
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Old 06-04-2011, 05:59 PM
Serf
 
Join Date: May 2011
Location: california
Posts: 7
Default Re: Oven base installation on existing (uneven) patio

Thanks everyone for your replies.

I've found the sand stone to "flake" a bit on the surface layer due to weather and the very porrus nature of the stone.

Do I need to worry about a heavy oven on top or will the weight of the oven and the fact that the sand stone is covered in cinderblock keep it from deteriorating?

Thanks! Steve
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Old 06-04-2011, 09:23 PM
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Default Re: Oven base installation on existing (uneven) patio

You could always mark out where your oven is going and cut through the sand stone down to the concrete.

If you do cut out allow 10-20mm all around for some jiggle room which you can later mortar up.

It looks like some of the sandstone has moved previously as there are cracks around the mortar pointing between the stones.
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Old 06-05-2011, 08:36 PM
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Location: Vancouver Island
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Default Re: Oven base installation on existing (uneven) patio

Your sandstone sections will likely crack.

As Brickie suggests, I would cut them back at the line of the new block wall. This can be done with either a masonry blade on a circular saw or (preferred) a masonry blade on an angle iron (keep the stone wet).

You can then leave the sand stone under the walls or remove then as you prefer. I would think that your existing base is more than adequate to support the proposed oven.

Last edited by Neil2; 06-05-2011 at 08:41 PM.
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Old 06-11-2011, 11:02 AM
Serf
 
Join Date: May 2011
Location: california
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Default Re: Oven base installation on existing (uneven) patio

Thanks everyone, appreciate the insight.
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  #9  
Old 06-13-2011, 05:53 AM
Peasant
 
Join Date: Jun 2011
Location: Ohio
Posts: 40
Default Re: Oven base installation on existing (uneven) patio

I have a similar situation as above. I have decided to construct a 4' square cinder block base on my brick patio. The patio is have been throug 6 Ohio winters, so it has settled as much as it's gonna.

Rather than place the block directly on the bricks, I bought nine 16" x 16" x 2" concrete squares and laid them on top of the brick. I figure this will help distribute the weight over a larger area and help alleviate my concerns that the brick might sink.

Initial layout of the cinder block atop the 9 squares revealed a tiny bit of wobble. I assume this would go away once the cinder block holes are filled with cement and the top cement form is applied.

The patio slopes left-to-right for drainage purposes. Thus the left cinder blocks are 1/2" higher than the right side. Is this a big deal? I could correct it on the 1st row, or on the top form...or keep it at 5 degrees (maybe water running off the top slab is a good thing?).

Anyone done something like this before? Am I an idiot?

Wednesday is when I start pouring cement down the block holes. Any input is really appreciated.
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Old 06-13-2011, 06:06 AM
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Default Re: Oven base installation on existing (uneven) patio

Your oven is very heavy. It will compress your brick patio, particularly if the bricks are laid on sand instead of stone dust. I'm a little concerned that uneven settling under load, combined with dry stacking of your blocks may create a problem down the road.

Are you space constrained? Why are you building on a finished patio, instead of pouring a proper slab next to it? Brick patios aren't cheap, I'm wondering why you are covering it up.
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