Keyfix Non-Combustible Cavity Tray Lintel (NCCTL) - Standard/ Heavy/ Extra Heavy/ Extreme
Verified by manufacturer 22 days ago
BBA Agrément Certificate
Certificate type
Cavity >50 mm | BBA | Part L & B Compliant | UKCA | CE | Galvanized & Stainless
Application
The NCCTL is for use in an exterior masonry skin in conjunction with a non-masonry inner leaf such as a steel frame system.
- 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 Keyfix'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 Keyfix'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 a Keyfix 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.
Description
A non-combustible stainless steel single-leaf lintel with combined cavity tray.
All Keyfix 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 patented NCCTL prevents thermal bridging. Keyfix's NCCTL conforms to the requirements of a cavity tray satisfying the NHBC & LABC Warranty 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 Keyfix Technical Department at info@keyfix.com or call us at +44 (0)28 8676 7508.
Refer to manufacturers' literature for details regarding lintel ranges, height, thickness, and Uniformly Distributed Load (UDL) figures.
Performance:
Fire:
- A1 - Non-Combustible.
- Keyfix's Non-Combustible Cavity Tray Lintels have been subjected to a fire test (Report No. 526744/R) in accordance with BS EN 1363-1, at Exova Warrington Fire and achieved a two-hour fire performance.
Corrosion:
- All Keyfix's range of Non-combustible Cavity Tray Lintels are manufactured from austenitic stainless steel, grade 304 2B BS EN 10088-2 ASTM 240 (European Grade 1.4307). Upon request, other grades of stainless steel lintels are available conforming to BS EN 845-2.
- The use of austenitic stainless steel is ideal when the life expectancy and maintenance programme of a building are key considerations.
- Material/coating specification in buildings exceeding three storeys in a non-aggressive environment should be limited to austenitic stainless steel (chrome nickel alloys).
- Material/coating specification for buildings in an aggressive environment (e.g. coastal sites) should be limited to austenitic stainless steel (molybdenum chrome nickel alloys).
Structural:
- The Keyfix range has safe working loads as detailed in each applicable loading table in the Keyfix NCCTL Datasheet.
- The structural performance figures within each table have been ascertained by testing in accordance with the requirements of standards BS EN 5977-2, BS EN 846-9 and BS EN 845-2.
Certification:
- BBA Agrement certificate 00/000 including regular assessment of production (pending).
- UKCA assessment of performance, system 3.
- CE assessment of performance, system 3.
- EN 1090-2 Execution Class 2, declaration method 1,2,3a & 3b, Certificate 14/F106 & 14/F107.
- ISO 9001 Quality Management Systems, Certificate 18/Q059.
- ISO 14001 Environmental Management Systems, Certificate 18/E019.
Galvanized steel:
- Keyfix's range of Non-combustible Cavity Tray Lintels can be manufactured from high-quality grade mild steel to BS EN ISO 1461 DX51D with a zinc coating of 710 g/m² (including both sides) conforming to BS EN 845-2.
Additional features:
- Free scheduling and specification service.
- Keyfix lintels have a service life commensurate with that of the building in which they are installed.
- Keying options to suit required plastering applications.
- Cavity closer.
- Cant brick.
- Powder coating.
- Stainless steel weep holes.
- Bespoke.
Contact Keyfix Technical Department for further information.
General information
Color | Silver |
Finish | Galvanized Metallic Manufacturer guidanceCold-rolled stainless steel. |
Material | Steel Guidance for specification option:
Stainless steel Guidance for specification option:
|
Length | Manufacturer guidanceRefer to Keyfix NCCTL Datasheet or contact Keyfix Technical Department for further information. |
Product certifications
BBA Agrément Certificate
BBA Certificate
Literature
Literature type
Keyfix Product Guide
Non-combustible Cavity Tray Lintel Datasheet
Keyfix NCCTL Brochure