How-to-fur-out-a-concrete-wall, furring strips are long, thin strips of metal or wood that create a support system for a finished surface in a room. furring strips are typically 1" x 2" or 1" x 3". they can be anchored to brick, block, or concrete either horizontally or vertically. in most applications, vertical anchoring is easier.. Furring strips or 2x4s against concrete basement wall? hey all - finishing my basement. we live in atlanta so you get an idea of the temps. several walls are floor-to-ceiling concrete. it's been painted grey, and my guess is that it was some sort of sealing paint. looks pristine.