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ronwass 03-14-2013 06:06 PM

Different kind of foundation. Am I crazy?
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My wife is letting me build an oven in the yard, after many years of pleading (on my part).

She doesn't like the idea of a hulking mass of concrete in the yard. I kind of agree with her. especially since I want the mouth of the oven to be higher up to cook from the deck. Deck is about 3 feet above ground.

Attached, find an idea for a foundation that uses piers and pressure treated girders.

Maybe 5 piers total? 4 at the corners, and one in the middle?

Does anyone see any problems? If so, what would you change? If not, what size footers would you use? 8 or 10 inch?

Mostly interested in suggestions to attach and pour hearth slab to top of the wood.

Advantages of this is that it is absolutely not affected by frost. Also, saves a ton (or three) of concrete mixing and pouring.

Faith In Virginia 03-14-2013 06:46 PM

Re: Different kind of foundation. Am I crazy?
Hello Ronwass, Are you crazy? The definition of crazy "Insanity is doing the same thing over and over again but expecting different results." Or asking the same question over and over expecting a different answer.

I think we already discussed this here...

What you need to consider is the pounds to the square inch of support to the total weight of the finished oven. 4 8x8' is 256 sq inches or 1.78 square feet. Not much support.

Also using piers that are not continuous to the load you will need to take into account any horizontal forces. So let's say the left side piers settle under the load you could have a tipping issue.

let's start there.

How tall will this base need to be to get the oven to the proper height to the deck?

silvfox 03-14-2013 07:28 PM

Re: Different kind of foundation. Am I crazy?
If I recall correctly when we last discussed building on peirs it was concrete peirs. The limitations and requirements will be similiar for wood. You could use treated 6 X 6 southern yellow pine set four feet below grade on concrete pads. Four posts, no need for a center post. Diagonal knee bracing with 2 x 6's will prevent racking. Use bolts not screws or nails.
Four 2 x 12's bolted thru posts with sixteen 1/2" galvanixed bolts serve as beams. 2 x 10's set perpendicular on beams 12" on center for joists, all pressured treated lumber. The concrete slab could be poured on a deck of corrugated steel or durarock.

ronwass 03-15-2013 12:21 PM

Re: Different kind of foundation. Am I crazy?
No, Faith, that last thread was about frost depth. This is about above ground structure.

This is something like what I am talking about although, obviously pier-ed into the ground in my case:

PhotoPlog - Hearth and Stand

Thank you for the info regarding the specifications. I'm going to examine them closely.

Regarding height, if I want to reach cooking height while standing on the deck, I need to add about 18 inches to standard height.

Faith In Virginia 03-15-2013 03:00 PM

Re: Different kind of foundation. Am I crazy?
That picture was a great help.

What I would do if you want something like the picture but fixed to the ground. Dig your four footers to the frost depth. I would make a pad about 18 inches square 6 inches deep for each post (others may have other recommendations on size) But I think that will work fine. Then take your pressure treated posts and run them from the footer to the bottom of the stand as one piece. (make sure the pressure treated is rated for below ground)

Then I would make that lower shelf at the same height as your deck and through bolt it to the deck at that point.

That should work just fine. I have my oven set on logs so no problems with wooden bases. I also think that would look quite nice.


silvfox 03-15-2013 04:13 PM

Re: Different kind of foundation. Am I crazy?
Faith it sounds like your on the same page as me with your suggestions and added more clarity to what I proposed. After seeing the photo my suggested lumber dimensions are overkill if the domed will just be stucco with no brick enclosure.

Faith In Virginia 03-15-2013 04:21 PM

Re: Different kind of foundation. Am I crazy?
Hi John, Yes that photo was worth 1000 words. I think it will be very sturdy and will look quite nice.

ronwass 03-15-2013 09:36 PM

Re: Different kind of foundation. Am I crazy?
Thank you both for the encouragement and specifics. I like your idea of the bottom shelf bolted to the deck.

Obviously that wasn't my picture and I may not make it exactly like that but I'll let u know how it comes along.

Faith In Virginia 03-16-2013 07:03 AM

Re: Different kind of foundation. Am I crazy?

We love pictures here so keep us up to date on your progress. If you have any structure questions about the base just ask. Then you get to the fun part...building the oven ;-)

Have fun!!!

ronwass 03-16-2013 09:37 PM

Re: Different kind of foundation. Am I crazy?
1 Attachment(s)
Thanks so much for the advice.

Well here's a picture of my lame mock-up so the wife could see what a giant oven looked like in the yard.

Created it in a matter of minutes with stuff lying around in my garage. Fastest oven build here I'll bet. Least functional oven though.

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