You will only need brick where the wood will touch. (firebox only) the insulation should be good everywhere else. Just multiple layers. This is how our Vortex is,
54 Acres bought in Sept 2010, hope for a lot of fun
Kabota 3400 w/ bucket
couple Husky chainsaws and a couple of Stihl
Big dream
2011 = 106 on gravity tubing, 100 bucket
2012 =700 vaccuum 100 gravity 80 bucket's
30" x 12' Vortex with Leader Revolution Max Raised pans
2013 = 1200 vac, 200 gravity, 5 buckets, buying from 300 buckets, 500 vac
Springtech RO 600 Deluxe
2015= 1800 all vac @ home, buying sap from 1200.
2017= 2200 all on vac. no longer buying sap
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