Calcium silicate or ceramic fiber board

[V-wiz]

I have to make a decision soon as i need to buy the insulation tomorrow. The cal-sil is rated at 1,200F density is 15 lb, dimensions are 12x36x2 , and its $10 a board, at that price i can double it and get a 4 inch insulation under the bricks. Is this overkill?. Or my other option is getting ceramic fiber, rated at 2,800F , density is 17 lb, dimensions are 24x36x2. The box comes with 3 boards and costs about $115. Please take a look at the specs, specifically the density. I would greatly appreciate the feedback. Thanks

[Laurentius]

Re: Calcium silicate or ceramic fiber board

OK, I will make up your mind for you. Purchase Cal-sil, double up to 4". Order NOW! Don't hesitate or think about it. "Just Do It".

[V-wiz]

Re: Calcium silicate or ceramic fiber board

OK, I will make up your mind for you. Purchase Cal-sil, double up to 4". Order NOW! Don't hesitate or think about it. "Just Do It".

Lol, ya that is my thinking also, my main concern is the 15 LB density VS the 17 LB Density of the Ceramic board.

[V-wiz]

Re: Calcium silicate or ceramic fiber board

Ill be driving down to the supplier today to pick up the boards. maybe 10 boards.

[Laurentius]

Re: Calcium silicate or ceramic fiber board

Let us know when you get it.

[V-wiz]

Re: Calcium silicate or ceramic fiber board

Here are some pictures from the warehouse that supplies industrial insulation. Pacific Insulation - Industrial Products - Pipe Insulation, Air Handling/HVAC, Industrial Insulation, Commercial Insulation, Insulation Fabrication. . Heavier than i thought they would be. Its pretty solid, Asbestos free and Made in USA.

[brickie in oz]

Re: Calcium silicate or ceramic fiber board

Its very porous.

[V-wiz]

Re: Calcium silicate or ceramic fiber board

Its very porous.

, Is that bad? Hopefully no water gets near it. Well its Cal sil and others have used these so i would think it should be ok?

[brickie in oz]

Re: Calcium silicate or ceramic fiber board

The stuff I bought didnt have the big holes in it like in your pic.

[V-wiz]

Re: Calcium silicate or ceramic fiber board

The stuff I bought didnt have the big holes in it like in your pic.

I see, im going to double it, so 4inches, hope thats enough, dont know much about these but just hope i made the right choice

[Laurentius]

Re: Calcium silicate or ceramic fiber board

Al,

It a sin to scare the timid! Be nice, its a new year.

[brickie in oz]

Re: Calcium silicate or ceramic fiber board

Only religious ppl have sins, I have no sins......

[david s]

Re: Calcium silicate or ceramic fiber board

, Is that bad? Hopefully no water gets near it. Well its Cal sil and others have used these so i would think it should be ok?

My cal sil board has no holes in it, but it is quite porous. I've seen some cal sil board that is completely waterproof though. Try pouring some water over it and see what happens. Either way it will still be quite ok for insulating under your floor. An alternative is to use vermicrete and that stuff is very water absorbant. Go ahead.

[V-wiz]

Re: Calcium silicate or ceramic fiber board

Thanks guys, there is no turning back im using these.

[rsandler]

Re: Calcium silicate or ceramic fiber board

I used the same product (although mine were largely smoother than the one you showed. I went with 4", and have no complaint. The underside of my slab stays at ambient temperature even when the oven is going full bore. It is fairly porous--I found it impossible to put the standard fireclay-sand-water leveling mix between the insulation and my floor bricks because the CalSil instantly sucked any moisture out of the mix.