Interesting - I was thinking about this as an option too and am glad to hear you've had good experiences with it. I have a bunch of roxul left over from a previous renovation, so I think I'll go this route and save myself a few bucks instead of doing the vermiculite. Did you cover the roxul with a lay of the fire blanket, or just leave it exposed? Given it's not loose like vermiculite, I'm thinking it would work without the need for a fire blanket.
It does not need fire blanket to cover it. Works just as well as fire blanket.
Only put it where it is not going to come into contact with wood from the firebox.
It will last a long time
600 taps on vacuum
Lapierre mechanical Releaser
CDL electric releaser
2.5 x 10 CDL Venturi
Home made auto draw off
Homemade RO 2 x 4" membranes
CDL 16 x 16 bottler
Wesfab 7" filter press
Delaval 73 vacuum pumps
12 hives of bees
I put a single layer of 1/2 fire brick on top of vermiculite. I wanted something lighter than sand and my experience with outdoor boiling taught me that sand absorbs moisture something awful. The layer of brick is less about insulation than it is making sure I don't trash whatever is back there with my flue brush.
Woodville Maples
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Around 300 taps on tubing, 25+ on buckets if I put them out
Mix of natural and mechanical vac, S3 Controller from Mountain Maple
2x6 W.F. Mason with Phaneuf pans
Deer Run 250 RO
Ford F350
6+ hives of bees (if they make it through the winters)
Keeping the day job until I can start living the dream.
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