IG Cavity Wall Lintels - Standard / Heavy / Extra Heavy / Extreme

Description

All IG standard 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 patented Thermal Break Plate reduces thermal bridging while adding extra rigidity. IG lintels are insulated with expanded CFC-free profiled polystyrene insulation conforming to BS EN 13163. 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

• Steel lintels for use in internal and external cavity wall construction to support walls, floors and roofs above window and door openings.
• Cavity widths greater than 50 mm.
• 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.
• Raise the inner and outer leaves simultaneously to avoid excessive eccentricity of loading, with a maximum height difference of 225 mm (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 (temporary propping beneath a steel lintel is practiced to facilitate speed of construction).
• 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.
• The external lintel flange must project beyond the window/door frame and it is recommended that a flexible sealing compound is used between the underside of the lintel flange and the frame. 
• Do not cut lintels to length or modify them in any way without consulting an IG engineer.  
• Lintel should be centred in the cavity and the distance between lintel up-stand and masonry must not exceed 10 mm.
• Masonry should not overhang any flange by more than 25 mm.  
• The practice of propping a lintel is sometimes used to facilitate speed of construction. It should only be introduced after initial masonry load has been applied to the lintel. 
• 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/l1s-50/
• https://iglintels.com/product/l1s-75/
• https://iglintels.com/product/l1s-100/
• https://iglintels.com/product/l1s-110/
• https://iglintels.com/product/l1s-130/
• https://iglintels.com/product/l1s-150/
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• https://iglintels.com/product/l1hd-130/
• https://iglintels.com/product/l1hd-150/
• https://iglintels.com/product/l1xhd-50/
• https://iglintels.com/product/l1xhd-75/
• https://iglintels.com/product/l1xhd-100/
• https://iglintels.com/product/l1xhd-110/
• https://iglintels.com/product/l1xhd-130/
• https://iglintels.com/product/l1xhd-150/
• https://iglintels.com/product/l5-50/
• https://iglintels.com/product/l5-75/
• https://iglintels.com/product/l5-100/
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• https://iglintels.com/product/l5-130/
• https://iglintels.com/product/l5-150/
• https://iglintels.com/product/l5xhd-50/
• https://iglintels.com/product/l5xhd-75/
• https://iglintels.com/product/l5xhd-100/
• https://iglintels.com/product/l5xhd-110/
• https://iglintels.com/product/l5xhd-130/
• https://iglintels.com/product/l5xhd-150/
• https://iglintels.com/product/l6-50/
• https://iglintels.com/product/l6-75/
• https://iglintels.com/product/l6-100/
• https://iglintels.com/product/l6-110/
• https://iglintels.com/product/l6-130/
• https://iglintels.com/product/l6-150/