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Santino 06-07-2011 01:07 AM

Question about insulation
Are there any other high temperature insulation blankets that are suitable for dome insulation other than ceramic fiber or CalSil? The shipping costs are what is preventing me from going forward with a purchase right away because I cannot find anything locally. I have spent weeks trying to find an alternative or a nearby supplier and I can't find anything. I know that I can use vermicrete, but was trying to go the easy route in terms of installation as well as just wanting to use a superior product. Any ideas?

Faith In Virginia 06-07-2011 01:50 AM

Re: Question about insulation
Yes try these guys

Harbison-Walker Refractories
2233 Interstate North Dr # F
Charlotte, NC 28206-1099
(704) 599-6540

I got all my supplies from the Salem VA office and they are great to work with.

Let me know how they work for you.


david s 06-07-2011 02:20 AM

Re: Question about insulation
For my first oven I used fiberglass roof insulating batts and when I finally pulled the oven apart there was no visible sign of any degradation, although others have reported that the binder sometimes burns. Maybe depends on the brand. Because the stuff is so light and fluffy it easily compresses which simply reduces it's insulating value. If you want to save money you could try a 2" layer of vermiculite, followed by a layer outside that of fiberglass insulation batt. The vermicrete layer should be enough to reduce any heat hitting the fiberglass. I think this would be ok for an enclosure but you still have the problem of the fiberglass wanting to compress if you render/stucco against it for an igloo style.

dmun 06-07-2011 06:50 AM

Re: Question about insulation

Yes try these guys
Harbison-Walker Refractories
As a note, H-W local offices vary greatly in how consumer/oven builder friendly they are. It's worth calling, yours might be great.

Santino 06-07-2011 08:57 AM

Re: Question about insulation
Thanks guys, I will take a look at all these. I also found a Denmark company called Skamol that has a Charlotte office and will see if they can help too.

Has anyone ever heard of someone using closed cell, 2lb density spray polyurethane foam insulation? I used to sell this stuff awhile back and remember a guy taking a blow torch to it and it held up wonderfully. I don't know if this would hold up over several years of use though. This was only to show me that it was virtually fireproof in the event of a house fire.

I was just wondering. It probably isn't a cost-effective method even if it does work, but it came to mind as something that might work well.

Santino 06-07-2011 09:23 AM

Re: Question about insulation
Faith, I just called HW in Charlotte. They had a fair price for the ceramic fiber board and a not so friendly price for the blanket.

Ceramic Fiber Board: 2" x 12" x 36" came in 8 pieces per box which was 24 sf...this came to $121.05...seems like it is way more than I need but maybe I can find other ways to use it.

Ceramic Fiber Blanket: 1" x 24" x 25' Roll was $4.37/sf or $218...WAY more than it would cost to get FB blanket + shipping to Charlotte.

BriggsARNP 06-07-2011 01:18 PM

Re: Question about insulation
I don't know. I just checked and it was going to be $300+ to ship fb blanket to WA state. The Harbinson etc. blanket and board was within $20 in Seattle when I called for a price.

Faith In Virginia 06-07-2011 01:59 PM

Re: Question about insulation
Well when I called my guys and they quoted me a price... there was some miss communication that went on ...well long story short they sold me the Ceramic Blanket for about half price. I was pleased that they stuck to their quote even when they took a loss for the material.

GianniFocaccia 06-07-2011 01:59 PM

Re: Question about insulation

I bought the same 24sq' box of 2"x12"x36" boards (8) from the Harbison Walker (ANH Refractories) in Los Angeles. Don't know the size of your oven, but after careful measuring I had just enough to cover a circle 53" in diameter (and the landing area) and have one board left for a door.

Santino 06-07-2011 02:26 PM

Re: Question about insulation
I'm building a 36" dome. I am assuming that the HW box we're talking about would be enough for this?

The math I've done tells me I can either install the HW board for $120 and practically no labor or wait time or install Vermicrete for about $42 and a lot more of my time and possibly my mistakes. I'm trying to figure out which one makes the most sense. However, if you feel I'll have enough leftover to insulate my door, then I'm pretty positive I'm going to get the HW board.

Going by the price of the dome insulation, for my situation right now (which is me being laid off at the moment), I think I'm going to go with 6" of vermicrete for the dome and then stucco over that. The price difference between the blanket and the vermicrete is about $200 by my calculations.

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