Using furring strips is one of several methods you can use to attach paneling, siding, or drywall to a masonry wall. Furring strips should be run perpendicular to joists at 6" or 12" intervals across the room. Or at least the splitting is minimal. Z Furring Channel. A non-core filled concrete block has very little R-value and a core filled concrete block has very little R-value too. Some variations of ceiling tiles are held up with screws and rosettes.