
09-24-2008, 05:26 PM
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 | Moderator | | Join Date: Jul 2005 Location: New Jersey USA
Posts: 4,216
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Re: FB Board versus vermiculite/perlite I used insblock19 because it was considerably cheaper than cal-sil boards at the time. I priced it from my local H-W dealer, but I got it cheaper from an internet supplier. You do have to buy the whole box, which gives you one board more than you need. Mine was 2.5 inches thick, which may be non-standard, and why I got it at a cheap price.
Insblock19 works fine. My support slab barely gets warm at full fire. My project stopped in the middle for the winter, and the insblock got damp repeatedly, with no compression problems.
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