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-   -   Calcium Silicate board thickness (http://www.fornobravo.com/forum/f8/calcium-silicate-board-thickness-18818.html)

Salty 01-09-2013 08:00 PM

Calcium Silicate board thickness
 
PLEASE HELP. I am ready to pour my foundation this weekend. I have 3 pieces on calcium silicate insulation but it measure at about 1 5/8". Other than that issue, it is definitely the good stuff, I bought it at Western Industrial Ceramics. So here is question....Is one layer enough? or should I my more so that I can double on to 3.25-3.5" of calcium silicate. Please help.

Les 01-09-2013 08:51 PM

Re: Calcium Silicate board thickness
 
I thought 2 inches was standard. I went with 4 inches and have zero regrets. Personally I would double up. It won't impede your progress of pouring the foundation so no hurries...

brickie in oz 01-09-2013 10:55 PM

Re: Calcium Silicate board thickness
 
I used 40mm thick which is about 1 and a 1/2", it will keep the oven hot for days on end.
Mind you, our climate is Mediterranean like.

Salty 01-10-2013 11:08 PM

Re: Calcium Silicate board thickness
 
My big issue is that it is going on top of only 1.75" of true concrete. I am thinking I might just double it up so that I dont have any regrets. Follow up question though...How important is insulation under the entrance/hearth? My entire floor will have almost 4" of CalSil, but my hearth is going to only have 4" of vermicrete. Is this going to compress at a different rate than the CalSil?

brickie in oz 01-10-2013 11:22 PM

Re: Calcium Silicate board thickness
 
Quote:

Originally Posted by Salty (Post 143859)
My big issue is that it is going on top of only 1.75" of true concrete. I am thinking I might just double it up so that I dont have any regrets. Follow up question though...How important is insulation under the entrance/hearth? My entire floor will have almost 4" of CalSil, but my hearth is going to only have 4" of vermicrete. Is this going to compress at a different rate than the CalSil?

4" is just over kill and a total waste of money. :confused:

Salty 01-11-2013 08:24 AM

Re: Calcium Silicate board thickness
 
Aww Man...Now you have me second guessing doubling up. It certainly would be cheaper to only have one layer. What is the best way to cut the CalSil? Band Saw? Table Saw? Circular Saw?

Also, has anyone tried cutting their fire brick with a table saw with a diamond blade? It obviously isnt a wet saw, but I think that is the best I can do without a big investment.

Now, that I think about it....with they money I save not buying more CalSil, I'll be able to buy the diamond blade...I would guess that is a fair trade off.

Les 01-11-2013 09:04 AM

Re: Calcium Silicate board thickness
 
Quote:

Originally Posted by brickie in oz (Post 143860)
4" is just over kill and a total waste of money. :confused:

Al, Are you sure about that? I recall reading where some have measured a termperature rise on the bottom of the hearth. I can see it being overkill if you are sitting that thick of board on top of vermiculite.

brickie in oz 01-11-2013 12:51 PM

Re: Calcium Silicate board thickness
 
Quote:

Originally Posted by Les (Post 143867)
Al, Are you sure about that?

Ive only got 40mm of calsil and nothing else under the hearth and after a pizza night we can cook for a week in the oven. :)

So I am just guessing that 100mm is overkill. :p

P.S. The hearth only has a thermal mass of 100mm.

Salty 01-11-2013 01:37 PM

Re: Calcium Silicate board thickness
 
Al,

Do you have Vermicrete under your calsil or is it regular concrete?

Gulf 01-11-2013 02:54 PM

Re: Calcium Silicate board thickness
 
Salty,
I wont get into the thickness of the calsil since I don't know how less than 2" perform. What does concern me is that you stated that: "My big issue is that it is going on top of only 1.75" of true concrete"

I may have missed something but, that is just a little over counter top thickness. Not a true weight bearing thickness for a WFO hearth. Is this 1.75" poured on top of some other load bearing structure?


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