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

All Keystone 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 Keystone patented NCCTL prevents thermal bridging. Keystone'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 Keystone Lintels Technical Department. Refer to manufacturers literature for details regarding lintel ranges, height, thickness and Uniformly Distributed Load (UDL) figures.

Performance:

Fire:

• A1 - Non Combustible.
• Keystone'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 Keystone’s range of Non Combustible Cavity Tray Lintels are manufactured from austenitic stainless steel, grade 304 2b BS EN 10088-Part 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 Keystone lintel range has safe working loads as detailed in each applicable loading table in the Keystone Lintels NCCTL brochure.
• 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 00/0000 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:

• Keystone’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 conforming to BS EN 845-2.

Additional features:

• Free scheduling and specification service.
• Keystone Steel 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 Keystone Lintels Technical Department for further information.