Concrete Block Forms North Americans have been building homes with wood for over 200 years.  This dependence on wood has reduced our national heritage of forests to 7% of the original stock. Today, the dwindling supply has resulted in increased costs of construction and decreased quality of green building materials. The current proliferation of alternate wall systems is the response to this alarming situation. The ICF (insulated concrete form) Block has an R-value of 47.5 - which is considerably higher than that of a traditional wood-frame wall. ICF Blocks have a wood layer on the interior for attaching drywall and for backing under the drywall. The exterior of the blocks are also immediately ready for stucco. The ICF Block wall system is also extremely energy efficient, environmentally friendly, sound resistant, fire resistant, and termite resistant. All of this is, in addition to the many other advantages of using ICF Block's, make it a smart and a green choice.