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  #41  
Old 04-14-2013, 04:43 AM
Serf
 
Join Date: Oct 2012
Location: cardiff uk
Posts: 10
Default Re: Hearth Design Philosophy

Someone has said have the floor 'floating' what exactly does that mean? I was intending to bed mine down using a quite wet mix of homebrew
( i intend to have my floor inside the soldier first chain).
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  #42  
Old 04-16-2013, 06:47 AM
adm adm is offline
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Join Date: Apr 2013
Location: UK - Surrey
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Default Re: Hearth Design Philosophy

Hi All,

First post....so be gentle! I am in the UK....so metric dimensions I'm afraid!

I am still at very early planning stage, currently deliberating between modular and brick built oven. I am leaning heavily toward full brick build though and am planning around that....

I am currently trying to draw out my base and hearth, so could do with some advice....

The base itself will be on a poured slab reinforced with rebar. I will put membrane down under the slab. Walls will be concrete block filled with concrete and rebar.

On top of that, I will pour another slab for the base of the hearth. I am thinking of making this 100 or 150mm thick, then laying a course of thermalite blocks on their side on top of that. On top of those, I would put 50mm of the ceramic fire block board and then finally on top of that the firebrick for the hearth itself. I am leaning towards having the firebricks on their side as opposed to flat to get some extra thermal mass.

So - does that sound about right? Or am I missing some vital ingredient? I see lots of vermicrete used in bases, but if I use thermalite blocks, the ceramic board and firebricks on edge, do I need it?

I like the idea of having the firebrick hearth cut to fit inside the oven dome, with a soldier course of firebricks around the outside rather than have the dome bearing on the firebrick floor....which gives me another question:

For the ceramic board - should that be cut to the same dimensions as the inside of the hearth itself with only the firebrick hearth on top of it, or should it cover the entire base of the oven with the dome itself also bearing on it? I am not sure how strong this stuff is in terms of compression and there would be a lot of loading on it from the dome.

Anyway, as you can see I am still at early planning stages but would welcome any advice!

Thanks,

Alasdair
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  #43  
Old 04-16-2013, 06:30 PM
ATK406's Avatar
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Join Date: Jul 2012
Location: Michigan
Posts: 184
Default Re: Hearth Design Philosophy

Quote:
Originally Posted by adm View Post
Hi All,

For the ceramic board - should that be cut to the same dimensions as the inside of the hearth itself with only the firebrick hearth on top of it, or should it cover the entire base of the oven with the dome itself also bearing on it? .....

Anyway, as you can see I am still at early planning stages but would welcome any advice!
Definitely insulate your dome walls from your support slab. It sounds like you are planning to use lots of insulation and that is a good thing. I must admit I'm a little confused by your description of the many layers of your slab/insulation/hearth floor. Have you sketched this out? Maybe a simple diagram of your plans and the associated materials would clear things up.

AT
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  #44  
Old 04-17-2013, 12:39 AM
adm adm is offline
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Join Date: Apr 2013
Location: UK - Surrey
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Default Re: Hearth Design Philosophy

Hi AT,

Thanks for the info. Maybe I am using different terminology, being from the UK and all that.....I have attached a quick diagram of my proposed construction - please excuse lack of scale or detail as I am still earning SketchUp for this project....



I hope this all makes sense. The "Thermalite" blocks are lightweight, insulating concrete blocks that are very common here. The Ceramic Fibre insulating board is what I think you all call "FB Board". Damp proofing membrane is a polythene sheet that will go under the base slab itself - I would also use another layer of DPM after the first ocurse of concrete blocks in the support walls.

Cheers,

Alasdair
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  #45  
Old 08-28-2013, 06:08 AM
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Join Date: Aug 2013
Location: Adelaide
Posts: 1
Default Re: Hearth Design Philosophy

Hi,

Looking to get some advice on the Hearth design in particular the insulation medium. I have purchased Vermiculite to blend at the suggested ratio of 5:1 with portland cement. Is the insulation cement strong enough to place the floor and dome directly on top of or is there an extra layer required to provide stiffness?
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  #46  
Old 12-02-2013, 05:09 AM
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Join Date: Oct 2005
Location: Gilbert, AZ
Posts: 420
Default Re: Hearth Design Philosophy

Quote:
Originally Posted by Cappa View Post
Hi,

Looking to get some advice on the Hearth design in particular the insulation medium. I have purchased Vermiculite to blend at the suggested ratio of 5:1 with portland cement. Is the insulation cement strong enough to place the floor and dome directly on top of or is there an extra layer required to provide stiffness?
Yes, it is more than strong enough to support your dome. You do not want your dome on up insulated material as the heat will get "sucked" out -that is a highly technical term ya know.

Chris
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  #47  
Old 12-02-2013, 05:13 AM
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Join Date: Oct 2005
Location: Gilbert, AZ
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Default Re: Hearth Design Philosophy

Quote:
Originally Posted by h12rpo View Post
Someone has said have the floor 'floating' what exactly does that mean? I was intending to bed mine down using a quite wet mix of homebrew
( i intend to have my floor inside the soldier first chain).
A floating floor is free to move with heating and cooling. Please do not bed your bricks and make sure there is a gap between the floor and dome (about the thickness of corrugated cardboard) to allow expansion of the floor outward without damaging the dome.
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  #48  
Old 01-19-2014, 05:54 AM
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Join Date: Dec 2013
Location: Louisiana
Posts: 1
Default Re: Hearth Design Philosophy

Door shape: Is there and advantage of the rounded doors? My house has straight lines and I am thinking of a rectangle door. Is this going to be a problem? 47 inch oven with16 inch dome height and 10 inch high by 20 inch door.
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