oven stand size

[thebigt]

Re: oven stand size

Good decision. Good luck w/it.

Thanks... I will be using the proper sized rebar and if it's too tall I'll look at putting in a small step.

[NCMan]

Re: oven stand size

Good decision. Good luck w/it.

[thebigt]

Re: oven stand size

I would pour a full four inch slab for the cantilever. For a cantilever, two thin concrete slabs set on top of one another doesn't equal what the strength of a full thick single pour would yeild. That is, if it is properly reinforced.

just sayin'

That's what we decided to do. Those pillars moved easily so today my brother and I used concrete glue to stick them in place and when I get back from my trip I am going to pour a new 60x70" hearth slab ib place of the old slab and go from there....in case I flip back to wanting a 36" oven ;P

[NCMan]

Re: oven stand size

I would pour a full four inch slab for the cantilever. For a cantilever, two thin concrete slabs set on top of one another doesn't equal what the strength of a full thick single pour would yeild. That is, if it is properly reinforced.

just sayin'

I agree. I know that will not be your ideal height, but at this point, to do it right, there is no other way. Is it feasible to add a small step later to make up the height difference? Also, I'd refrain from using that 3/4" rebar.

[Gulf]

Re: oven stand size

I need an additional 4 inches of depth to accommodate a 32" Pompeii oven. The additional 2 inch slab on top was to add thickness to support the weight

I would pour a full four inch slab for the cantilever. For a cantilever, two thin concrete slabs set on top of one another doesn't equal what the strength of a full thick single pour would yeild. That is, if it is properly reinforced.

just sayin'

[david s]

Re: oven stand size

David.....can you clarify to me how cantilevering a slab makes it stronger?

If your supports under the slab are inboard from the perimeter (cantilevered) then you reduce the span between the supports. This means that less strength is required to support the same load and that means that you can make the supporting slab thinner if you wish.
It's like building a house of cards, only you make sure it won't fall down.

[thebigt]

Re: oven stand size

I need an additional 4 inches of depth to accommodate a 32" Pompeii oven. The additional 2 inch slab on top was to add thickness to support the weight

[thebigt]

Re: oven stand size

My foundation was built two years ago and is 50*50. I poured it this way as I had planned on doing that foam form oven then got smart and decided on a pompeii

[NCMan]

Re: oven stand size

I think what you may mean is perhaps this: not making the slab bigger to make it stronger, but keeping it the same size and building the foundation a bit smaller, thereby placing more of the load over your foundation? I'm guessing that's what you mean.

[NCMan]

Re: oven stand size

I usually cantilever the supporting slab. I think it looks better and because the span is less than if you have your supports at the outside, it makes it stronger too. Remember that most of the weight is inboard from the perimeter so the supports are better placed under where the weight is. Regarding size, my oven is very small (21") by most members standards but does pizza parties of up to 35 easily and cooks the family roast or a few loaves of bread with minimal fuel. A small oven is also way cheaper and faster to build. "small is beautiful" For some reason Americans have been led to believe that bigger is better. Look at their cars of the 70's

David.....can you clarify to me how cantilevering a slab makes it stronger?

[thebigt]

Re: oven stand size

If I could get away workout having to pour a slab on top even better as the height is perfect now but I want it to last... Perhaps may pouring a new slab with the proper thicknesses is the right thing to do.

When wanting to make everything perfect I keep second guessing which route to go lol

[NCMan]

Re: oven stand size

I just had some 3/4" rebar but I can purchase another size if thats too big.

Basically what I was looking to do was build another piece between my two existing slabs to fill that gap in the picture. This would essentially allow me to make my hearth 56". From what ive been told a canteliver has to be 4" thick and my existing slab is only 2 1/2" thick so I wanted to pour another 2" thick slab over the entire area to make it 4 1/2" thick.

So....you are pouring a 2" cap on top of the existing? If so, in my opinion, I would not use any rebar in something that thin, even 3/8". I would advise using a small aggregate, a strong mix and perhaps some fiber mesh on something that thin. There are builders on here w/experience pouring slabs that thin for counter tops,etc. that can probably give you firsthand help and most of my experience is pouring "normal" thicknesses. I feel the slab is not thick enough at 2" to use rebar, especially if they overlap. Using rebar that is too thick can have an adverse effect on the slab and actually cause a crack. Also,there is no standard that states how thick a cantilever has to be. All this is just my opinion. I would hope others, especially those w/experience pouring thin slabs, will chime in.

[thebigt]

Re: oven stand size

The thickness of your cantilever, or whole slab for that matter depends on how much weight you're asking it to support. Plenty of builders have cut their bricks with a 5" angle grinder fitted with a diamond blade ( but wear a decent respirator the brick dust is dangerous)

I just need the additional canteliever to hold up the oven entrance.

[david s]

Re: oven stand size

The thickness of your cantilever, or whole slab for that matter depends on how much weight you're asking it to support. Plenty of builders have cut their bricks with a 5" angle grinder fitted with a diamond blade ( but wear a decent respirator the brick dust is dangerous)

[thebigt]

Re: oven stand size

I'm not sure I follow what you plan to do, but 3/4" rebar is a bit thick. Did you mean 3/8"?

I just had some 3/4" rebar but I can purchase another size if thats too big.

Basically what I was looking to do was build another piece between my two existing slabs to fill that gap in the picture. This would essentially allow me to make my hearth 56". From what ive been told a canteliver has to be 4" thick and my existing slab is only 2 1/2" thick so I wanted to pour another 2" thick slab over the entire area to make it 4 1/2" thick.