building code. Often called "hat channels" to describe the profile (cross section), they consist of two flanges on each side of a trapezoid shape, 7/8 in thick.

Furring is also used to support roof materials and may be seen under barn and shed roofs but is now used less often, replaced by labor-saving plywood. Drywall has become the most common interior wall finishing material and does not need furring due to its strength. Furring is still used in remodeling work to fill