#1  
Old 04-02-2014, 06:25 AM
Serf
 
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Location: El Paso Texas
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Default Base on existing Cement, is this recommended?

Hello I am a complete noob to the whole oven experience and eager to learn all I can to build a great piece. My whole concern before I even begin contemplating the design of my build revolves around a comment I read on the instructions for a barrel oven through brickwoodovens. It stated that it is not recommended to build the oven on an existing cement patio or slab due to the amount of weight it will be delivering to the cement. Is this a true statement or was it a general warning to avoid possible legal issuesI ask because I have mostly only pre-laid cement available to start a build and the area that could serve to dig is small and currently used to entertain my 2 year old baby girl and I just don't have the heart to take up space in her area. Also because this patio is in the back part of my home it has a pitch to help with water drainage, Is it possible to build on top of this cement and later compensate for the angle to make a level surface. Please help as I am a complete newbie and while the info on this forum is great many of the terms are yet confusing and a bit overwhelming. Thank you!
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Old 04-02-2014, 09:20 AM
Peasant
 
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Location: Anchorage, AK
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Default Re: Base on existing Cement, is this recommended?

A typical patio slab is going to be a relatively thin poor of non reinforced concrete, and who knows what type of prep work was done to the soil, i.e. digging down and putting in a layer of compacted gravel.

Odds are such a slab will crack when the weight of a concrete block base and WFO is built on top of it. You're looking at ~1000#'s, a couple thousand $ in materials and several 100 hours of labor. It would be a pity to have all the effort and money lost because you didn't put in a proper foundation.

If you're not able or willing to put in a proper foundation, I think you'd be better off looking at one of the pre made portable ovens with a stand.
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Old 04-02-2014, 09:49 AM
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Default Re: Base on existing Cement, is this recommended?

That is a good question. I think I agree with Paul though. Last thing you want is put a lot of effort and money into building your oven on a foundation that is "not quite strong enough". I estimated my oven to weigh about 8000 lbs. I would definitely think you want your concrete slab to be re-bar reinforced.
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Old 04-02-2014, 12:17 PM
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Default Re: Base on existing Cement, is this recommended?

A bigger problem than the slab is the ovens from that company.
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Old 04-02-2014, 06:31 PM
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Default Re: Base on existing Cement, is this recommended?

There 2 things of major importance that you need to be sure of. 1. Is you foundation going to be up to specification for what you put on top of it and 2. Is what you are going to put on top of it up to specification for what you want it to do.

Foundations are a bit like insulation, more is better and the minimum will barely suffice.

Barrel ovens are good for what they are good for and dome ovens are good for nearly everything. Just my humble opinion. You will get all of the advice you can handle once you decide exactly what you want to build.
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Old 04-02-2014, 07:03 PM
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Default Re: Base on existing Cement, is this recommended?

If the sub grade is prepared correctly then 4" is fine.
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Old 04-02-2014, 07:10 PM
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Default Re: Base on existing Cement, is this recommended?

Quote:
A bigger problem than the slab is the ovens from that company
I second that.
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Old 04-02-2014, 07:47 PM
Serf
 
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Default Re: Base on existing Cement, is this recommended?

Well that does make a lot of sense I guess when it comes down to all the work you are going to go through why not be safe than sorry. And I really don't know the extent of the way the cement was laid so I guess that really sums it up for me. Digging it is for me I guess, I know the baby will appreciate the times we will be having by the wood fired oven. Now to convince the spouse that I will be robbing the baby of some playing space . Nothing
I cant fix with a little shopping . Thank you to all who posted I really appreciate the advice and I can now start the planning for my brick oven.

P.s. the mold option seemed a little cheesy and lacked pride if you ask me, which is how I stumbled across this great forum.

again thanks a lot!
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Old 04-03-2014, 05:43 AM
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Default Re: Base on existing Cement, is this recommended?

Quote:
Originally Posted by stonecutter View Post
If the sub grade is prepared correctly then 4" is fine.
There are quite a few factors that make up the strength, or suitability of a slab for it's intended use. I have to respectfully disagree w/Stonecutter w/the 4" thick slab statement. Will 4" work most of the time, if all other factors are good? Yes. But, just having a 4" slab w/a proper base is, in my opinion, not enough. If you are going to invest the time and money into a WFO on a slab/footing, make sure it's designed to do what you are considering. Anyone considering building a WFO w/block base, etc., should do some research before starting. The difference in time and expense between "rolling the dice" and doing it as it should be done, is not alot, for the peace of mind you will get. Remember, everything starts w/a good foundation. Not the place to cut corners. Just an opinion from an experienced concrete person.
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Old 04-03-2014, 06:51 AM
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Default Re: Base on existing Cement, is this recommended?

Mario

I also second the comment about a Brickwood Oven, I started to build one and then built a Pompeii instead. See my thread here:

http://www.fornobravo.com/forum/f8/3...nia-19283.html (32 Inch Pompeii in Northern California)

Neil
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