Sean's Oven

[mfiore]

Re: Sean's Oven

Only you can determine what something is worth. From what I've read on the post, 4 inches of vermiculite should provide the same insulation value as 2 inches of FB board. Sure, you can never have too much insulation. But at some point you have to draw the line. I think you'll be fine.

Don't take my word, though. I'm not even at that point of my build yet!!

[spbarr]

Re: Sean's Oven

I decided to go with vermiculite instead of FB board because of the shipping costs. I have 4.5 inches of vermiculite with the second pour, shouldn?t that be enough? If not Maybe I will reconsider the FB board. Is it worth the additional money?

I don?t have a definite plan for the right side I was thinking it would be a prep surface.

-Sean

[mfiore]

Re: Sean's Oven

Did you decide to used vermiculite instead of the FB board, or together?

[egalecki]

Re: Sean's Oven

What goes on the offshoot to the right? Is it just counter with storage underneath?

Your concrete looks great, not to worry. As you said, it gets covered.

[spbarr]

Re: Sean's Oven

PROGRESS!

So, OK I am not a good concrete guy, that’s ok it will be covered! I did build my slab a bit thick and mixed the vermiculite separate which was poured a few days later. Since I had to burn the entire yard of concrete I didn’t leave 4 inches for vermiculite. I will pour a 3 inch layer on top of the existing slab like I have seen others do. This will give me about 5 inches of vermiculite, which should keep it nice and warm.

-Sean

[carioca]

Re: Sean's Oven

This is the stuff I mean:

<snip>
You could ask the vendor if the product is right for your application.

Thanks mate! Looks like it's more intended as a sealant than a 'glue' but will check it out...
Rgds,

LMH

[dmun]

Re: Sean's Oven

This is the stuff I mean:

Refractory Mortar, Sealant 3200 degree 11 oz. tube - eBay (item 3852622609 end time Jun-24-08 08:03:04 PDT)



You could ask the vendor if the product is right for your application.

[carioca]

Re: Sean's Oven

<snip>

There is also a refractory adhesive sold in tubes for caulking guns, but I don't think many people here have used it. It's expensive.

Hi dmun, do you happen to know name/brand of such adhesive? I need exactly that to 'glue' together two halves of my oven door ( the one that doesn't have any touching metal parts but is held together by the insulation)...

Cheers,

LMH

[PizzaJNKY]

Re: Sean's Oven

For the mortar, I would go with Refmix. The stuff is easy to work with, and is rock solid.

[spbarr]

Re: Sean's Oven

Dmun, Frances and TheBadger:

Thanks for the reply, it sounds like FB board is the recommended way to go? If I go with FB board should I pour a 3.5" hearth still or go a bit thicker?

Also another question what mortar should I use for the oven?

Drake,

I'm in Walnut Creek CA

Cplain,

I am planning on it being a prep surface.

Thanks all for the responses; I am hoping to be curing the oven in a few weeks!

-Sean

[cplain]

Re: Sean's Oven

Sean

From your pix looks like you're building an extension to the right...will that be prep surface? or grill?

Craig

[DrakeRemoray]

Re: Sean's Oven

Great to see another oven started. Where are you in CA?

[thebadger]

Re: Sean's Oven

agree 100

I just put my FB board down - no adhesive. Trust me - it's not going anywhere.

Dick

[Frances]

Re: Sean's Oven

From what I've heard (being a vemiculite hearth insulator), the FB insulating board sticks to the hearth by gravity. Put it down, build an 800 kg oven on top... it won't go anywhere...

[dmun]

Re: Sean's Oven

Hi, Sean.

The vermiculite concrete should be four inches thick for proper insulation. Cal-sil (FB) board will work at a two inch thickness. I used a mineral wool product from HW, insblock19, which came in 2.5 inch thickness. I laid the board down directly into the wet concrete of the support slab, and it worked well. The Cal-sil board has a tendency to soak up water, and will suck the moisture out of your concrete if you apply it directly. It has been suggested to place vapor barrier plastic over the wet concrete, and put your boards down, that way you can thump them into position, and get a good match between the surfaces, but the board won't effect the concrete.

There is also a refractory adhesive sold in tubes for caulking guns, but I don't think many people here have used it. It's expensive.