Rmax ThermaBase-CI is applied to wood framing with the insulation to the interior and wood to the exterior in order to provide a continuous layer of thermal insulation and a suitable substrate for the mechanical attachment of many different kinds of cladding systems. The standard nailing surface for ThermaBase-CI is 7/16” OSB (APA rated). Alternate nailing surfaces, such as 5/8” or 3/4” OSB or CDX plywood, are available upon request. ThermaBase-CI is engineered to allow for normal expansion of the wood without gapping the insulation layer. While the composite panel and polyiso layer are a nominal 4' x 8', the wood is slightly under a true 4' x 8'. When manufactured, the wood is bonded to the polyiso layer leaving a 1/16" to 1/8" overhang on two adjacent edges.