36" Pompeii in DC

[Gulf]

Re: 36" Pompeii in DC

So, if I'm following you correctly, it's worth putting mortar down to make sure the individual blocks lay flat, but I don't need to worry if the whole thing is sloped slightly, because the form will fix that. Makes sense.

I'm liking the C; for some reason it hadn't occurred to me that I could just add more bricks or blocks on the counter side to get the level up--since I'm thinking of putting something on the hearth landing to get it level with the oven entry, making the counter support taller could make things a lot easier.

Laying the mortar down on the first row can help with two things:
1. Helping to get the stand back into level (atleast some of it) .

2. It will help you dry stack the remaining courses without as much "wave" in the block which will give you tighter "dry stacked" joints.

Even if you had the foundation "perfectly level" and then "dry stacked" block on top or it you would not "top out" the stand perfect. Concrete blocks ain't perfectly formed. Close but no cigar .

I think that option C will be your best, if you want to keep the landing and side counters even. It gives you some room for adjustment at a later date.

[rsandler]

Re: 36" Pompeii in DC

So, if I'm following you correctly, it's worth putting mortar down to make sure the individual blocks lay flat, but I don't need to worry if the whole thing is sloped slightly, because the form will fix that. Makes sense.

I'm liking the C; for some reason it hadn't occurred to me that I could just add more bricks or blocks on the counter side to get the level up--since I'm thinking of putting something on the hearth landing to get it level with the oven entry, making the counter support taller could make things a lot easier.

[Gulf]

Re: 36" Pompeii in DC

You may want to lay the bottom row of block in a bed of mortar, if you feel that it needs the extra leveling. However, you can correct for a lot of differential with the form for the hearth.
Also, I would go with "C". You can adjust the level with brick, block etc. when you find out what the exact height of your landing is going to be.

Edit: I was referring to "dry stacking" the remaining courses of the the stand.

[rsandler]

Re: 36" Pompeii in DC

Laid out the blocks for the first course of my stand last night. I didn't do too horribly at getting the pad level, but I'm definitely going to need mortar to get the blocks nicely level.

In the meantime, I've been thinking ahead to my hearth and how to do the counter on the side of the oven. Originally I had envisioned pouring concrete, at the same time as the heath itself, but I'm realizing that might be somewhat complicated. Certainly more work than pouring the pad and just placing/pouring a countertop surface at a later date.

As I see it, the advantage of having the countertop be on top of concrete is that then it will be level with the oven landing. The downside is a more complicated and challenging concrete pour (something I've already shown I'm not that good at!)

I see four options:
(1) Make an L of blocks, place a slab of countertop on this later, resulting in a counter lower than the oven landing (picture 1).
(2) Make and L of blocks, pour 3.5" of concrete at the same time as the hearth. (picture 2)
(3) Make a C of blocks, and pour a 3.5" slab at a later date. (picture 3)
(4) Make a rectangle of blocks and pour a 3.5" slab at a later date. (picture 4)

Of course, these are not mutually exclusive. Perhaps I need to do a C or a rectangle and pour it with the hearth. But I figure it I'm just holding up a slab of counter, I don't necessarily need the kind of lintel needed to hold a much bigger hearth plus a ton of oven.

Suggestions appreciated!

-Ryan

[rsandler]

Re: 36" Pompeii in DC

Dino: Yeah, the rain's been giving me grief already and I'm not very far along. I'm contemplating getting some kind of canopy to put over the oven so I can work in a light rain. It wouldn't keep things dry in one of these crazy thunderstorms, but it would keep me from having to cover everything up every time it starts to drizzle.

Gulf: Good to know! It seems like the edges of the hole have been holding together in the short term, so with any luck I'll avoid any mini landslides until I can get a retaining wall in there.

-Ryan

[Gulf]

Re: 36" Pompeii in DC

Your foundation looks great! They don't have to be "perfect" and trialed to a glass finish.

Also, I don't see any major drainage problems up hill of your oven base. As you said "just a little more digging" and maybe a very short retainer wall on the uphill sides. You could finnish the oven and wait until you have a better idea of how to finish the patio area in front of the oven before you worry about that.

[Dino69]

Re: 36" Pompeii in DC

Hey, rsandler. I am a bit south of you in Harrisonburg.

The rain has been slowing me down all summer. I would be finishing my dome this weekend but I am on call and it is raining.

The slab looks good and your work is just starting.

David

[rsandler]

Re: 36" Pompeii in DC

Yesterday my office was gave everyone the afternoon off, and conveniently we had ~3 tons of concrete mix delivered that morning. So in honor of Labor day, my wife and I labored heartily to pour the slab foundation! I should note that neither of us had any experience with pouring concrete save for filling a couple of post holes long ago. So it was an adventure. We took turns doing the mixing in the wheelbarrow, 3 bags each and then switch. We managed to get it done, but oy, that was a chore.

Just starting:


Me mixing concrete


My lovely wife taking her turn (I owe her big time for helping on this!)



All done!


Not the prettiest concrete slab ever. Indeed, a candidate for the ugliest! But, like the Pompeii plans say, no one will ever see it, so it just has to be level and structurally sound. Fairly sure I managed that...

[rsandler]

Re: 36" Pompeii in DC

More progress:

My "assistant" helping tamp down gravel in the excavation:



Graveled, framed and plastic down:



Wider view:



I thought I was digging out enough to have room for a retaining wall on the back and left side, but it ended up being tighter than expected. I'll probably have to do some more digging after the foundation is poured and the form is out of the way.

I've also gotten the rebar and remesh all cut to size (fun with angle grinders), and would have gotten it in the frame and tied up, but I got chased inside by the rain. A task for tomorrow night, or maybe later this evening.

Then, time to figure out how I'm getting concrete

-Ryan

[rsandler]

Re: 36" Pompeii in DC

Thanks, that's helpful. A retaining wall is probably the way to go, although it will be a bloody pain since it will end up being underneath the deck as a result :P.

[Gulf]

Re: 36" Pompeii in DC

1. I wished that I had of placed a 4" row to make my oven higher. Many suggest that you do a mock up to help you decide what is the correct height for you. Will you be installing some type of pavers in front of your oven in the future? Most are a minimum of 2".

2. If the slope where you are placing your oven is this steep, then chances are the slope behind and in front are too. You could dig down level behind your oven and install a short retainer wall. This dirt can be used to back fill the retainer wall and/or build up in front of your oven stand.
My advice is to install the retainer wall a few feet behind your oven and train the water to run on either side and away from your oven base. Do not use your stand as a retainer wall. That opens up a whole can of worms .

Once this area is level you can adjust the form to what you need. Many use a 4" form on top of the drainage gravel. I tend to over build .

[rsandler]

Re: 36" Pompeii in DC

Thanks, that's helpful. Two questions though (asked because although I know I've seen pictures on the forum I couldn't turn any up in a quick search): (1) Wouldn't that make the front of my oven an additional 4+ inches above ground, making my work surfaces possibly too high? (2) The slope is actually greater than the height of the form, so how does that affect things?

[Gulf]

Re: 36" Pompeii in DC

I've nearly got the foundation dug out, and I've realized that the ground slopes down about 6 inches from the back of my foundation to the front. Any suggestions out there on how to put a level 5.5" concrete pad onto a 6" slope? I'm a total newbie at this sort of thing.

Hope this helps. There are a lot builds out there that have plenty of pics for this too.

[rsandler]

Re: 36" Pompeii in DC

I've nearly got the foundation dug out, and I've realized that the ground slopes down about 6 inches from the back of my foundation to the front. Any suggestions out there on how to put a level 5.5" concrete pad onto a 6" slope? I'm a total newbie at this sort of thing.

[UtahBeehiver]

Re: 36" Pompeii in DC

Good luck and come back to this forum a lot for ideas and what to do and what not to do. Will be watching your build.