Ceramic Fiber Board in Canada (Newfoundland)?

[Michael Thomas]

Hi,

I'm looking for a ceramic fiber board for a 42 inch diameter oven. I might need two board to cover the full area. Any suggestions on where I can find a ceramic fiber board in Canada? I live in Newfoundland, Canada, postal code A1B 1N7

Michael

[JRPizza]

Michael, I don't think you will be able to get by with 2 boards unless they are very big boards! My boards were 1 x 3 feet. I built a 39" oven which put the outside of the brick dome at 48", so I was able to get by with 6 boards per layer, and I did 2 layers like you have been asking about. My board was 2.5" thick. If you build a 42" oven you will need to span at least 51" with your board. Part of the reason I built @39" was to be able to fit the oven on board the way I did. You can see one of my layers at the link below.

https://community.fornobravo.com/for...392#post380392

[Michael Thomas]

thanks so much for the detailed reply. I'm excited to use your advice and get things moving on ordering supplies!

[UtahBeehiver]

I would check with refractory suppliers in one of the larger cities near you such as Montreal or Quebec. These are a couple critical spec items you need to look for, compression @5% - min 75 PSI, K value 0.55 BTU*in/(hr*ft2*F) at 500 F. Couple brands, Thermo Gold 12, InsoBloc, you can use either CaSi or AlSi. You can always look at a vermiculite or perlite concrete mix for both the floor and dome insulation, it just more thickness (abt double) to get the same insulation value of the high tech ceramic boards. Cheaper but more labor involved. Key is finding perlite or vermiculite, most mason/block suppliers carry these materials as filling the cores for insulation

[Michael Thomas]

yeah - I think because of shipping costs, your suggestion to go with Vermiculite/Perlite is probably the one I'll go with. Thanks again for the detailed response.

[UtahBeehiver]

If you go v or pcrete, make sure you confirm the mix ratios with the forum before you do it. Under the floor and over the dome are different.

[Michael Thomas]

wow thanks, this is invaluable. But I have a question. I see from the table that there are 3 options for each of the dome and under firebrick floor. Which one do I choose?

[UtahBeehiver]

Not sure what you are talking about, what three options, those are ratios.

[UtahBeehiver]

On the previously attached table, there is a "note" by the 5-1 ratio that this is the one for under the floor as well as a "note" by the 8-1 for the dome insulation (could go up to 10 -1) but it starts get harder to apply.

[Michael Thomas]

I understand now, thanks.

[TommyTongue]

Hi I am also in Canada and finding it difficult and extremley expensive to find ceramic board. However I have found rockwool board. would this be a viable replacement? 2 have an r value of 6 and the other a r value of 32.
"rockwool Comfortboard 80" R6
Rockwool Comfortboard IS" R32
ROCKWOOL R6 "ComfortBoard IS" Insulation

[UtahBeehiver]

No, the compressive strength is too low, 439 PSF = 3.0 PSI, recommended compressive strength should be at least 75 PSI at 10% compression. Look for perlite or vermiculite and make p or v crete.

[TommyTongue]

No, the compressive strength is too low, 439 PSF = 3.0 PSI, recommended compressive strength should be at least 75 PSI at 10% compression. Look for perlite or vermiculite and make p or v crete.

Ok Thanks. I can soucre vermiculite. I guess 4 inch is the thickness to get same insylating value as the ceramic board. I have found a supplier but it is $19 dollars a square foot...Is that about right. It comes in 6 sqft boards

[Blairt]

No, the compressive strength is too low, 439 PSF = 3.0 PSI, recommended compressive strength should be at least 75 PSI at 10% compression. Look for perlite or vermiculite and make p or v crete.

How do you calculate the compressive strength? I talked to a guy at a distributor in Ontario who recommends K-FAC 19


He says they use only 2" of this as the base under the pizza ovens he builds. Do you think this is sufficient?

[UtahBeehiver]

It is shown in the spec sheets at 4800 PSF which equals 33.3 PSI at 10% compression, recommended compression is at least 75 PSI at 5% compression so this product is on the very low end of the scale at 33.3 PSI and also twice the % of compression. I would look at a different product. Direct commercial links are not permitted on the forum so I am deleting the direct link. Also 2" of insulation is the minimum floor insulation for high tech insulation, ie CaSi or Alsi board. You can Google for compression calculators form PSF to PSI but basically dividing by 144.