IG Non Combustible Cavity Tray Lintels (NCCTL) - Standard / Heavy / Extra Heavy Duty

Description

All IG Non Combustible Cavity Tray 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 NCCTL satisfy fire safety requirements of Approved Document B of the Building Regulations within buildings over 11 m in height.

Reaction to fire classification = A1 (non combustible) in accordance with BS EN 13501-1 as defined in 96/603/EC. Meets the requirements of material/coating specification requirements within PD6697. The IG patented NCCTL prevents thermal bridging. IG's NCCTL conforms to the requirements of a cavity tray satisfying the NHBC & LABC technical guidance.

The NCCTL patented mechanically fixed stop ends are prepositioned within perpend joints to accommodate brickwork openings. The installation of the NCCTL requires no additional specialist skills. The ease of installation in the outer leaf combines the structural load bearing lintel with the advantages of a self-supporting cavity tray.

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

• For use in an exterior masonry skin in conjunction with a non-masonry inner leaf such as a steel frame system (SFS) to support masonry above window and door openings.
• Cavity widths greater than 50 mm.
• Lintels should be installed with a minimum end bearing of 150 mm, product end bearing varies (consult IG's Technical Department), 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.
• Masonry should be laid on a mortar bed and all perpendicular joints should be filled.
• The NCCTL is a practical solution which is built into the outer leaf as normal and facilitates easy access for the profiling of insulation and the overlap positioning of the cavity facing membrane if required (this should be completed independently, once the lintel is securely built into the brickwork).
• 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. 
• 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 mechanically fixed onto the NCCTL at each end 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/non-combustible-cavity-tray-lintel/