Easily accommodates rigid insulation and provides for the attachment of gypsum wallboard, veneer or plaster to the interior of masonry walls. Zfurring must be installed vertically with the 34 flange against the substrate. The type of fastener and spacing will vary based on application. Gypsum wallboard may be installed parallel or perpendicular to the Zfurring. Metal lath should be installed perpendicular to the Zfurring.