Other thermic wall building materials are functionally as effective: concrete, rammed earth, adobe, superadobe, and slag, stone, or bag walls. Locally sourced common concrete or cinder blocks are fine.ĭry stack block with SBC was never the primary focus of our HTM design, simply an economical construction option for homeowner-builders. No need for importing expensive special 'interlocking dry stack blocks' when you are dry stacking with SBC. Should you have poor quality block in your area, a thin coat of mortar can be added wherever needed to bring wall back to plumb. The rest of the dry stack block courses are laid without need for any mortar between blocks as long as they are of uniform size. With dry stack construction, only the first course is bedded in grout on the footer to establish plumb and level for the wall. SBC is commonly required by local building code for sub-grade mortar block walls to ensure integrity. So it should be nothing 'new' to an experienced engineer. SBC 'stucco' with horse hair and calcium carbonate was used hundreds of years ago to build huge water storage cisterns. Drystack concrete block (cinder block) technique uses surface bonding cement SBC instead of mortar for high thermal mass HTM thermic walls that are waterproof and much stronger than conventionally laid mortar block walls.
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