Product Information

Wall Construction
Timber Frame
Outer Leaf
Inner Leaf
Wall Width
Loading Conditions


Product Code Standard Length (mm) SWL (kN) Weight (kg) Nominal Height (mm)
CTF90750 750 5 2.83 146
CTF90900 900 5 3.39 146
CTF91050 1050 5 3.96 146
CTF91200 1200 5 4.52 146
CTF91350 1350 5 5.09 146
CTF91500 1500 5 5.66 146
CTF91650 1650 7 7.77 146
CTF91800 1800 7 8.48 146
CTF91950 1950 7 10.14 201
CTF92100 2100 7 10.92 201
CTF92250 2250 7 11.70 201
CTF92400 2400 7 12.48 201
CTF92550 2550 9 19.76 271
CTF92700 2700 9 20.93 271
CTF92850 2850 9 22.09 271
CTF93000 3000 9 23.25 271
CTF93300 3300 9 25.58 271
CTF93600 3600 9 27.90 271
CTF93900 3900 10 37.48 271
CTF94200 4200 10 40.36 271
CTF94575 4575 10 43.97 271
CTF94800 4800 10 46.13 271
  • The SWL (safe working load) is based on the total UDL (uniform distributed load) over maximum span using 150mm end bearings.
  • Standard lengths are available in increments of 150mm at lengths up to 3000mm, 300mm at lengths from 3000mm - 4800mm (including 4575 but excluding 4500mm).
  • CTF lintels should be suitably propped and secured with provided restraint clips and timber batten (not provided) during construction.


Steel lintel for use in timber frame construction, consists of single element lintel, allows vertical differential movement of timber frame. Built in DPC thanks to Catnic's signature black powder coating
  • Duplex Corrosion Protection
  • Built-In DPC
  • Made in the UK for a lower carbon footprint and certified to BES 6001 Responsible Sourcing standard.
  • Made using lower carbon manufacturing
  • It is possible to reuse all of our lintels, providing that they are not damaged. Contact our technical team for more information
Catnic standard duty timber frame lintel for 90-105mm cavity wall shown in situ
  • Built-in Damp Proof Course (DPC) Profile

    Many Catnic lintels offer a unique profile shape that combine with the unique Duplex Corrosion Protection or stainless steel to create an effective barrier that acts as a built-in DPC, meaning any water penetrating into the cavity automatically transfers across the sloping face of the lintel and is disposed of externally.

  • Duplex Corrosion Protection

    A coating of thermal setting polyester powder is then applied by an electrostatic process, further protecting the lintel.

What our customers think

Video Guides

When selecting a lintel, there are three factors that should be considered to ensure the correct specification: the type of wall construction, the dimensions of the structural opening and the total load on the lintel. In this video, we run you through the lintel selection process.

Catnic thermally broken lintel installation

Once you have chosen the correct lintel for your project, it is crucial that the lintel be installed properly – if it is not, it could lead to serious issues for the building. In this video, we explain the installation considerations for cavity wall lintels.

Builder installed Catnic CG90/100 lintel

Catnic’s Thermally Broken Lintel is the only lintel on the market to provide a complete thermal break between the inner and outer leafs. In this video, we outline the key benefits of Thermally Broken Lintels and explain the installation process.

Catnic TS90/100 lifted into position by builders

Steel lintels, and specifically Catnic's thermally broken lintels, have a significant role to play in reducing thermal bridging and achieving carbon gains. They represent one of the simplest and most economical ways for building fabric to be designed and constructed to help achieve the carbon gains necessary to meet current and future building regulations.

Catnic balcony installation at kingsdown gate

Support & FAQs

Calculating the load imposed on lintels depends on a variety of factors, including the wall type in which the lintel is installed, and whether floor or roof loads need to be accounted for in addition to masonry loads. Lintels are primarily design to support uniformly distributed loads (UDLs) but on occasions point loads also need to be considered. This guide only provides an overview of how the loads on lintel are established and should not be used as a substitute for obtaining loading calculations either direct from the lintel manufacturer or from a qualified structural engineer.

Specifying Catnic’s Thermally Broken Lintels (TBLs) will significantly improve the thermal efficiency of a property and help ensure that the project’s necessary environmental credentials are met. Specifying Catnic TBLs can be done with ease as they have the same safe working loads as Catnic’s traditional lintels – meaning TBLs can be specified like for like. Catnic TBLs can also be used for standard duty, heavy duty and extra heavy use, making them suitable for a wide range of projects. You'll find our full range here

The correct specification of lintels is crucial, however it is just as important to ensure that each one is installed correctly. Here are five top tips to ensure an trouble free installation. To watch our video on installing cavity wall lintels click here

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