Comfort Block is a fully-insulated, self-contained 16-inch-thick concrete block wall system that replaces wood and drywall, offering an alternative for builders looking to use energy-efficient products. The blocks are reportedly fire-resistant and mold- and pest-free, and require only thinset or concrete glue to secure in place, cutting down installation time and labor costs. Once set, the blocks are covered by plaster on the inside and stucco on the outside. Current pricing is $10.50 per square foot installed.