Lintel Type : Timber Frame Lintels
Cavity Width : 50-65mm
Lintel Duty : Standard Duty
Catnic
Catnic CTF5 Standard Duty Timber Frame Lintel
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The Catnic CTF5 Standard Duty Timber Frame Lintel is designed to support external masonry above openings in timber-frame construction with a 50–65mm cavity and a 100–102mm outer masonry leaf. Its steel profile accommodates differential vertical movement between the timber frame and the masonry, while Catnic's Duplex corrosion protection and built-in DPC help manage moisture. We offer 18 lengths from 750mm to 4800mm, with safe working loads ranging from 5kN to 10kN depending on length.
Catnic CTF5 key features
Timber-frame construction
Designed to support the outer masonry leaf above openings in timber-frame walls.
50–65mm cavity
Suitable for a 50–65mm cavity with a 100–102mm outer masonry leaf.
Differential movement
The lintel profile accommodates vertical movement of the timber frame relative to the masonry outer leaf.
Standard duty loading
Published safe working loads of 5kN, 7kN, 9kN or 10kN, depending on length.
Built-in DPC
Incorporates a damp-proof course. Additional DPC may be required in some installation or exposure conditions.
Duplex corrosion protection
Galvanised steel protected by Catnic's black polyester powder coating.
Dimensions and specification
| Manufacturer | Catnic |
|---|---|
| Product code | CTF5 |
| Lintel type | Standard duty timber-frame steel lintel |
| Wall construction | Timber frame with masonry outer leaf |
| Cavity width | 50–65mm |
| Outer masonry leaf | 100–102mm |
| Inner leaf | Timber frame; not a masonry inner leaf |
| Available lengths | 750–4800mm, with 18 sizes available |
| Nominal height | 128mm, 183mm or 256mm, depending on length |
| Nominal end bearings | 150mm at each end |
| Safe working load | 5–10kN, depending on length |
| Built-in DPC | Yes. Additional DPC may be required in some situations. |
| Installation restraint | Restraint clips and timber batten required during construction |
| Finish | Galvanised steel with black polyester powder coating |
Catnic CTF5 lengths and safe working loads
The CTF5 has different safe working loads and section heights according to length. The table below covers all 18 sizes we supply.
| Lintel length | SWL | Nominal height |
|---|---|---|
| 750–1500mm | 5kN | 128mm |
| 1650–1800mm | 7kN | 128mm |
| 1950–2400mm | 7kN | 183mm |
| 2700mm | 7kN | 183mm |
| 3000–3600mm | 9kN | 256mm |
| 3900–4800mm | 10kN | 256mm |
Where to use a Catnic CTF5 timber frame lintel
The CTF5 is designed for openings in timber-frame construction where the external brick or block leaf requires support independently of the timber structure. Its profile accommodates differential vertical movement between the timber frame and the masonry outer leaf.
The 50–65mm cavity specification is important. For larger cavity widths, a different Catnic timber-frame lintel may be required.
Choosing the correct CTF5 length
Catnic's published loading figures use nominal 150mm end bearings at each end. As a general starting point, allow 300mm in addition to the clear structural opening width.
For example, a 1200mm opening would normally require a 1500mm lintel to allow 150mm bearing at each end. Always confirm the loading requirements before ordering.
Installation and restraint requirements
Catnic specifies that CTF timber-frame lintels must be suitably propped and secured with restraint clips and a timber batten during construction. The timber batten is not supplied with the lintel.
Restraint clips must be securely fixed to the timber frame in accordance with Catnic's instructions. The installation must allow for the differential movement for which the lintel has been designed.
Related cavity and timber-frame lintels
If your project uses a different cavity width or traditional masonry cavity-wall construction, explore our cavity lintel range or Catnic lintels.
Check that the chosen lintel is designed for your wall construction. Timber-frame and conventional masonry cavity-wall lintels are not automatically interchangeable.
Technical downloads
Frequently asked questions
What is the Catnic CTF5 used for?
The Catnic CTF5 is a standard duty steel lintel designed to support the external masonry leaf over openings in timber-frame construction with a 50–65mm cavity.
What cavity width is the Catnic CTF5 designed for?
The CTF5 is designed for a 50–65mm cavity and a 100–102mm outer masonry leaf. The inner structure is timber framed.
What lengths of Catnic CTF5 do you stock?
We offer 18 lengths from 750mm to 4800mm. Choose your required size from the options above, and check the safe working load for your selected length.
What is the safe working load of a CTF5 lintel?
The safe working load depends on length, with published ratings of 5kN, 7kN, 9kN or 10kN across the range. Refer to the loading table above for the relevant length group.
Does the CTF5 require propping and restraint clips?
Yes. Catnic requires suitable temporary propping and restraint clips, secured with a timber batten during construction. The timber batten is not supplied.
Does the Catnic CTF5 have a built-in DPC?
Yes. The CTF5 incorporates a built-in damp-proof course. Additional damp-proofing may be required depending on the installation and exposure conditions.
Does the CTF5 allow movement of the timber frame?
Yes. Its profile accommodates differential vertical movement between the timber frame and the external masonry leaf.
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