The addition of insulation to the exterior of buildings is an effective means of increasing the thermal resistance of both wood-framed walls as well as mass masonry wall assemblies. The location of the insulation to the exterior of the structure has many direct benefits, including better effective R-value from reduced thermal bridging, better condensation resistance, reduced thermal stress on the structure, as well as other commonly associated improvements such as increased airtightness and improved water management. For thick layers of exterior insulation (levels > 1.5 in.), the use of wood furring strips attached through the insulation back to the structure has been used by many contractors and designers as a means to provide a convenient cladding attachment location

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