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Forno Bravo Forum: The Wood-Fired Oven Community (http://www.fornobravo.com/forum/)
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-   -   FB Materials List (http://www.fornobravo.com/forum/f6/fb-materials-list-1605.html)

Hendo 02-27-2007 03:29 AM

FB Materials List
 
Last October I posted a plea for brick numbers needed for a 43” diameter oven. In particular, I asked for clarification of the numbers needed for the dome – the FB materials list for a 42” oven stipulates 180 but does not say whether they are half bricks or whole.

Since that time, I’ve considered various members’ views and projections of dome quantities (esp dmun’s CAD drawings), and done some mathematical modelling of my own. All of this leads me to believe that the “180 firebricks” specified in the FB materials list relates to half bricks, rather than whole ones, as whatever method I employ to estimate whole brick numbers, I end up with more or less half of the 180 stipulated. And this is for a 43” oven, rather than a 42” one.

You will appreciate that at around $4 per brick, I really don’t want to get too many more bricks than I require, and I am curious to know how the figure of 180 was derived.

James – anyone – can you shed some light on this?

Cheers, Paul.

oventhusiast 02-27-2007 05:15 AM

Re: FB Materials List
 
As requested by Hendo, I would also like to know the number of bricks and 'half bricks' needed for the oven floor and dome. Now don't get me wrong, I love this forum (I'm on here almost every night for new info about building,etc.) and it is very helpful, fun, and encouraging for all interested in building, cooking and maintaining these wonderful ovens! However, the Pompeii section is a bit wishy washy in it's attempt on materials and building tips. Maybe I'm stuck on searching for exactly what I'd like to see to build my oven the way I'd like it to look. I know there are many ways to go about building a 42" Pompeii but I wish the instructions were a bit more straightfoward with more photos and explanations of those photos. :)
Any brick numbers out there?
Thanks much,
Rick

maver 02-27-2007 06:14 AM

Re: FB Materials List
 
I bought extra bricks with the intention of building my 42" dome and (hopefully to start this spring) a fireplace to extend the season of my patio guests. I am going entirely on memory here, but I believe I purchased 280 whole bricks intending to have 100 left over for the fireplace. I ended up having way too many left over and donated the extras to another FB forum member who has since built his own oven (I think I gave him 75, and imagine he had to buy some more - are you out there, Jack?). I think the count is for 1/2 bricks, but the hearth is made with whole bricks, so I hope someone who did better accounting than I did will weigh in.

jengineer 02-27-2007 01:12 PM

Re: FB Materials List
 
Answer - it depends I think the answer lies somwhere between 180 to 210. The original "test" oven built was 42inches and needed 180 full bricks some of which were cut in half

This is not a precise construction project and as you see for the do it yourselfer the instructions are more of a guide rather than a definitive answer. You end up playing a balance game of
1. you want enough material to do the job - some bulk buying may help
2. you do not want to make unnecessary trips back and forth to get your material last minute
3. however you don't want to have so much of a surplus that your building costs (firebrick at $4 a brick having 25 extra is another $100) get too high.

So check with your supplier about their return policy. Some places do allow for returns.

DMUN 36 inch CAD production uses a minmum of 172 bricks; 69 are full bricks for the floor, 94 are cut in half for the soldier course and rings and 9 are neither full nor half as they make up the cap and are all specially cut. This does not include his count for the archway which is subject to very hot exhaust gases and should be of temperature resistant materials. Having a large entranway does increase his count by another 44 special tapered bricksand an unknown number of splits for the smoke chamber.

Mike built a 42 incher and needed more than the 180
http://www.fornobravo.com/forum/f2/c...ricks-255.html

I don't want to highjack the thread but somewhere someone posted teir results for a 36 inch unit in which they used 200 firebricks and another 120 common clay. I have no idea how they got such a good price on the fire brick.

36 inch pompeii

Foundation
4" @ 71"x80" = 22 - 80# bags of concrete
(I used fiber reinforced concrete so no steel was necessary)

Stand
Roughly 48 blocks (I poured a lintle across the opening)
12 - #4 x 36" rebars
Each cell requires 1 60# bag of concrete ($3.29)

Hearth
6.5" hearth requires a smidge more than 8 cf of perlite (I got mine in 4 cf bags - $7.95)
1 - 94# bag of portland cement ($8.36)
6 - #4 x 10' rebars cut to fit ($4.29)
17 - 80# bags of concrete ($4)

Oven Dome & Floor
1 - 24" x 2.5" x 3/16" angle iron (stainless is nice)
200 fire bricks ($1.17)
1 - 25# bag fire clay ($8)
1 - 94# bag portland cement
2 - 60# bags general purpose sand ($2.49)

Insulation Layer (6")
4 - 4 cf bags perlite
2 - 94# bags portland cement

Oven entrance & chimney
120 common clay bricks ($.71)
4' - 1.25" x 1.25" stainless angle ($28)
25# of fire clay
1 - 94# bag of portland
3 - 60# bag of sand

Stucco Finish (scratch coat and finish)
1 - 60# bag stucco cement ($4)
4 - 60# bags sand

Chris 02-27-2007 06:56 PM

Re: FB Materials List
 
Here is my list of materials.

I built a 42" pompeii. I used a total of about 150 bricks, and that includes the wasted pieces. If I were a little more efficient, I might have gotten away with 145 or so. The floor was made up of sleepers in a herringbone pattern, and the dome was made with bricks cut into thirds. The face of the "third" brick was 4.5" x 2 ", and they were 3" deep.

jengineer 02-28-2007 07:44 AM

Re: FB Materials List
 
Note the single malt

Hendo 02-28-2007 08:12 PM

Re: FB Materials List
 
jengineer – thanks for your input, it is greatly appreciated. I have a few more questions and comments though:
Quote:

Originally Posted by jengineer (Post 8336)
I think the answer lies somwhere between 180 to 210. The original "test" oven built was 42inches and needed 180 full bricks some of which were cut in half

Was this for the floor and the dome combined, or just the dome? I should state that I’m ignoring (for the moment) the number of bricks for the vent – these will likely be whole bricks and I can easily estimate the number required. And people’s requirements for the vent/entrance vary wildly with their chosen method of construction and/or placement – eg dmun’s radial approach – so perhaps it should be excluded altogether from the materials list or itemised separately. After all, a 42” dome with the recommended opening will demand a finite number of bricks, depending only on its height. It would be helpful for all if the size of the bricks was stipulated, too, as there appears to be a variety of sizes available around the world.

Quote:

Originally Posted by jengineer (Post 8336)
This is not a precise construction project and as you see for the do it yourselfer the instructions are more of a guide rather than a definitive answer.

Accepted – but I think you’ll agree that 180 versus 90 bricks for the dome (if this is what’s needed) ain’t a good guide, and contrasts with the excellent guidance provided elsewhere in the instructions.

Quote:

Originally Posted by jengineer (Post 8336)
So check with your supplier about their return policy. Some places do allow for returns.

My supplier is happy to accept returns, but I note maver’s comments on 10-17-2006 about possible damage occurring during transportation and handling, due to their weight. So I’d rather not have to return too many.

Quote:

Originally Posted by jengineer (Post 8336)
Mike built a 42 incher and needed more than the 180
http://www.fornobravo.com/forum/f2/c...ricks-255.html

Wasn’t this the total brick count, rather than just the dome?

Thanks to all for taking the trouble to contribute – I’m starting to feel more confident about my firebrick order now, despite the issues raised.

Or perhaps that’s just the glow after a few drams of Bowmore Darkest! How many oven builders are single malt enthusiasts, I wonder? BTW Highland Park 25yo I’d rate as probably my all-time favourite malt, although I wouldn’t say I’ve ever tasted a really bad one…. I hadn’t thought of costing any against my brick oven account, though. Creative book-keeping indeed!

Cheers, Paul.

CanuckJim 03-01-2007 02:59 AM

Re: FB Materials List
 
Paul,

I'd have to agree wholeheartedly about Highland Park. I'm also fond of the Irish Redbreast. Both malts to contemplate truth by.

Jim

james 03-01-2007 06:12 AM

Re: FB Materials List
 
Why don't I take the time at this point to collalate all this into an updated Materials List page which gives ranges for the 36" and 42" oven. I will do that now, and when the pages are updated, I will let you know and everyone can give it a good lookover before we call it a clean new draft.
Sound good?
James

DrakeRemoray 03-01-2007 07:39 AM

Re: FB Materials List
 
Highland park 25! Wow, I am a big fan of the 12yr and occasionally the 18...never had the 25...

Drake


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