Lintel Type : Cavity Lintels
Cavity Width : 90-105mm
Lintel Duty : Extra Heavy Duty
Thermally Broken : No
Wide Inner Leaf? No
Catnic
Catnic Extra Heavy Duty 100mm Cavity Lintel CX90/100
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The Catnic CX90/100 100mm cavity lintel is an extra heavy duty steel lintel for structural openings in cavity walls. Designed for a 90–105mm cavity with a 100–115mm inner leaf, it features a built-in DPC, integral plaster key, continuous insulation and Catnic's Duplex corrosion protection finish. Choose the required length and check the loading specification for your application.
Catnic CX90/100 key features
Extra heavy duty
Designed for high-load cavity wall openings and structural applications.
Built-in DPC
The lintel incorporates a built-in damp-proof course. Additional DPC may be required in some situations.
Integral plaster key
Perforated inner flange and plaster-key features help with plaster finishing.
Continuous insulation
The insulated core helps reduce cold bridging and supports thermal performance.
Wide load support
Designed to support concrete floors, roof loads, timber floors, attic trusses and triangulated masonry loads.
Duplex corrosion protection
Galvanised and powder-coated finish provides long-term resistance, including in coastal marine and other harsh environments.
Dimensions and specification
| Manufacturer | Catnic |
|---|---|
| Product code | CX90/100 |
| Lintel type | Extra heavy duty cavity wall lintel |
| Wall construction | Cavity wall |
| Cavity width | 90–105mm |
| Inner leaf | 100–115mm |
| Available lengths | 900–4500mm available from Wade |
| End bearings | Minimum 150mm each end |
| Built-in DPC | Yes. Additional DPC may be required in some situations. |
| Plaster key | Integral |
| Insulation | Continuous insulated core |
| Corrosion protection | Galvanised and powder-coated Duplex finish |
| Approval | BBA Agrément Certificate No. 91/2638; BS EN 10088-2-1.4301 |
Where to use a Catnic CX90/100 cavity lintel
The CX90/100 is designed for structural cavity wall openings from 750mm up to 4500mm, subject to the selected lintel length, load and required end bearings.
It can support concrete floors, roof loads, uniformly distributed timber floor loads, attic trusses and triangulated masonry loads where the specified loading conditions are satisfied.
Installation considerations
For best results, ensure the blockwork fits snugly within the web of the steel cavity lintel and allow the supporting blockwork sufficient time to cure. Both inner and outer masonry leaves should be raised together, and wide openings should be suitably propped to allow mortar curing time.
Catnic CX90/100 safe working loads
The safe working load of the CX90/100 depends on the selected lintel length. The published ratings reduce for longer spans.
| Lintel length | Safe working load |
|---|---|
| 900–2700mm | 60kN |
| 2850–3000mm | 55kN |
| 3300–3900mm | 50kN |
| 4200–4800mm | 32kN |
Thermal performance and damp protection
The CX90/100 has a continuous insulated core designed to reduce the effect of cold bridging. Its insulation can be considered as part of the overall assessment of Part L compliance.
The lintel incorporates a built-in damp-proof course, with a profile designed to direct moisture out of the cavity. A drip on the leading edge helps shed water that may penetrate the window head brickwork. Additional DPC may be required in some situations, depending on the installation and exposure conditions.
Related Catnic cavity lintels
For alternative loading and thermal performance requirements, compare these Catnic lintels:
- Catnic CH90/100 Heavy Duty Cavity Lintel
- Catnic TX90/100 Thermally Broken Extra Heavy Duty Cavity Lintel
Browse the cavity lintel collection or view all Catnic lintels available from Wade.
Technical downloads
Catnic lintel video guide
Watch the Catnic lintel video guide for further product information.
Frequently asked questions
Is the Catnic CX90/100 suitable for a 100mm cavity wall?
The CX90/100 is specified for a 90–105mm cavity and a 100–115mm inner leaf. Confirm the actual cavity width and wall construction before selecting a lintel.
What is the maximum opening for the CX90/100?
The appropriate structural opening depends on lintel length, required end bearings and loading conditions. Select the correct lintel length using the available options and refer to Catnic's published technical guidance.
What safe working load can the CX90/100 support?
Catnic publishes safe working loads of 60kN, 55kN, 50kN and 32kN across the CX90/100 range, depending on lintel length. Refer to the loading table above and the manufacturer's technical guidance.
Does the CX90/100 require a separate DPC?
The CX90/100 incorporates a built-in DPC. Additional DPC may be required in some situations, depending on installation and exposure conditions. Follow Catnic's guidance for the intended application.
Does the Catnic CX90/100 have an integral plaster key?
Yes. The CX90/100 incorporates plaster-key features, including a perforated inner flange to assist plaster finishing.
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