The Keystone BOX/K200 Lintel is a standard load lintel that is 1200mm in length and is used to support internal openings with 200mm wide solid walls. The box lintel has perforations along its length acting as a plaster key. Box lintels are designed to carry the full load of wet masonry as soon as it is installed. Box lintels must have a minimum end bearing of 150mm on each side of the opening, bedded on mortar.
- Lintels may be propped to facilitate speed of construction