Product Information

Wall Construction
Cavity Wall
Outer Leaf
Inner Leaf
Wall Width
Loading Conditions


Product Code Standard Length (mm) SWL (kN) 1:1/19:1 Weight (kg) Nominal Height (mm)
TH190/1250750 750 32 10.88 154
TH190/1250900 900 32 13.06 154
TH190/1251050 1050 32 15.24 154
TH190/1251200 1200 32 17.41 154
TH190/1251350 1350 32 19.59 154
TH190/1251500 1500 32 21.77 154
TH190/1251650 1650 32 23.94 154
TH190/1251800 1800 32 26.12 154
TH190/1251950 1950 48 35.06 229
TH190/1252100 2100 48 37.76 229
TH190/1252250 2250 45 40.46 229
TH190/1252400 2400 45 43.15 229
  • 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 2400mm.
  • Separate DPC tray required
  • When using the Catnic TH and TX Open Back ranges with concrete floors, always ensure that the blockwork is built tight against the inner vertical face, and that a mortar joint is added to the top of the blockwork so that the floor units have an even spread over the inner flange of the lintel.
  • Achieving a remarkably low Psi value ensures this Catnic lintel will always meet the performance criteria requirements of Appendix Q found in SAP 2012 providing easy compliance with Part L of the Building Regulations


Steel lintel with unique thermal break for use in cavity wall construction, designed to support typical masonry, timber floor and roof loads found in most buildings and suitable for fairfaced inner leaf masonry. The easy to use open back profile allows masonry to be built up continuously on both outer and inner leaf, available in standard, heavy, and extra heavy duty from 90-205mm cavities. Fully insulated, with complete thermal break, integral plaster key and Catnic's signature black powder coating.
  • Psi values of 0.02 to 0.05 W/mK
  • Duplex Corrosion Protection
  • Integral Plaster Key
  • Integral Insulation
  • Made in the UK for a lower carbon footprint and certified to BES 6001 Responsible Sourcing standard.
  • Made using lower carbon manufacturing
  • Designed to maximise energy saving at home
  • It is possible to reuse all of our lintels, providing that they are not damaged. Contact our technical team for more information
Catnic heavy duty thermally broken cavity wall lintel for 190-205mm cavity wall shown in situ
  • Psi values of 0.02 to 0.05 W/mK

    Independently verified by the Building Research Establishment.

  • Continuous Insulation

    Many Catnic lintels are supplied with CFC and HCFC free insulation maximising their thermal efficiency and compliance with Part L.

  • Duplex Corrosion Protection

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

  • Integral Plaster Key

    Many Catnic lintels come complete with an integral plaster key that avoid the hazards of working with a mesh key.

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

Request a Schedule

Which product would you like to request a schedule for?

Get a Free Quote

Which product would you like to get a quote for?