Is rigid insulation on an interior basement wall (cmu) between furring considered continuous?
No, if the basement wall is being furred out, insulation installed between the furring would be considered cavity insulation. Cavity insulation is insulation installed in the cavities between structural members, such as wood studs, metal framing, and Z-clips. Continuous insulation runs continuously over structural members and is typically rigid foam board. Cavity insulation is affected by thermal bridging, while continuous insulation reduces thermal bridges. Insulation to be installed between furring or studs is entered in the Cavity R-value column. If the installed wall insulation will be continuous (such as with exterior rigid insulation or interior “draped” insulation), the insulation R-value is entered in the Continuous R-value column. A combination of insulation systems may be used. For example, installing R-13 batt insulation between the studs and R-5 rigid insulation on the exterior of the stud wall.