Cresco Concrete Products, LLC
Liteblok's precision-molded aerated concrete (AC) blocks can be cut with a handsaw and accept regular nails and screws. Their interlocking shape means they fit together without the need for mortar, and plumbing and electrical can be installed through the vertical holes. GreenSpec lists these blocks for the performance benefits they share with aerated autoclaved concrete (AAC), but we have some caveats. Depending on the product, the portland cement content can be very high, and although aeration reduces the content per functional unit, portland cement has high embodied energy. On the plus side, these blocks are not baked, in contrast with typical AAC. Also, Cresco claims that 8" blocks provide an R-value of 35, but it does not clearly distinguish in its product literature between this "mass-enhanced' R-value, which is climate-dependent, and the more commonly understood steady-state R-value. In one technical bulletin the company states a R-value based on Australian testing of 1.3/inch, which is more in line with typical AAC.