IG Box Lintels - Standard / Heavy / Extra Heavy Duty

Description

All IG box lintels satisfy the thermal performance requirements of Approved Document L of the Building Regulations (E & W), Northern Ireland’s Technical Booklet F and Scotland’s Technical Handbook, section 6. The IG box lintel has perforations along its length acting as a plaster key. IG box lintels can be insulated. In external walls provide a damp proof course / cavity tray over all lintels.

For more detailed information applicable to a particular wall construction, contact IG Lintels Technical Department. Refer to manufacturers literature for details regarding lintel ranges, height, thickness and Uniformly Distributed Load (UDL) figures.

Application

• Box lintels for use in internal and external cavity or solid wall construction to support walls, floors and roofs above window and door openings.
• Solid wall construction.
• Lintels should be installed with a minimum end bearing of 150 mm, bedded on mortar and levelled along its length and across its width.
• The masonry above the lintel should be built in accordance with BS EN 1996-2.
• The box lintel is designed to carry the full load of wet masonry as soon as it is installed.
• Masonry should be laid on a mortar bed and all perpendicular joints should be filled. Allow the mortar to cure before applying floor or roof loads.
• NHBC & LABC recommend a damp proof course (DPC) or cavity tray should be installed over all openings in external cavity walls.
• When installing concrete floor units or other heavy components above a lintel, care should be taken to avoid shock loading and floor units should not be dragged into position. Masonry immediately above the lintel should be allowed to cure.
• Point loads should not be applied directly onto lintel flanges. Lintels should have a minimum of 150 mm masonry between the flange and the application level of any form of loading. Consult IG’s Technical Department if applying a point load above a lintel.
• Do not cut lintels to length or modify them in any way without consulting an IG engineer.  
• Masonry should not overhang any flange by more than 25 mm.  
• Stop ends are required at each end of a lintel to prevent moisture cascading over the ends into the cavity and onto the inside wall.
• At least two weep vents are required per opening and positioned not more than 450 mm apart. 

Product Links

• https://iglintels.com/product/box-75/
• https://iglintels.com/product/box-100/
• https://iglintels.com/product/box-140/
• https://iglintels.com/product/box-200/