Lintel Type : Cavity Lintels
Cavity Width : 70-85mm
Lintel Duty : Standard Duty
Thermally Broken : No
Wide Inner Leaf? No
Catnic
Catnic CG70/100 Standard Duty 70mm Cavity Lintel
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The Catnic CG70/100 Standard Duty 70mm Cavity Lintel is designed for masonry cavity walls with a 70–85mm cavity, a 100–115mm inner leaf and a 100–102mm outer leaf. Its open-back steel profile allows masonry to be built up continuously on both leaves, while integral insulation, a plaster key and built-in DPC provide additional construction benefits. We supply ten lengths from 900mm to 3600mm, with safe working loads ranging from 15kN to 26kN depending on length.
Catnic CG70/100 key features
70–85mm cavity walls
Designed for a 100–115mm inner masonry leaf and a 100–102mm outer leaf.
Standard duty loading
Suitable for specified masonry, timber floor and roof loads within Catnic's published loading conditions.
Open-back profile
Allows masonry to be built up continuously on both the inner and outer leaves and suits fair-faced inner leaf masonry.
Built-in DPC
Incorporates a damp-proof course. Additional DPC may be required in some installation or exposure conditions.
Integral insulation and plaster key
Continuous insulation helps reduce thermal bridging, while the integral plaster key assists plaster finishing.
Duplex corrosion protection
Manufactured from galvanised steel with Catnic's protective black polyester powder coating.
Dimensions and specification
| Manufacturer | Catnic |
|---|---|
| Product code | CG70/100 |
| Lintel type | Standard duty cavity wall lintel |
| Cavity width | 70–85mm |
| Inner leaf | 100–115mm |
| Outer leaf | 100–102mm |
| Available lengths | 900–3600mm, ten sizes |
| Nominal height | 136–216mm, depending on length |
| Nominal end bearings | 150mm at each end |
| Safe working load | 15–26kN, depending on length |
| Built-in DPC | Yes. Additional DPC may be required in some situations. |
| Plaster key | Integral |
| Insulation | Continuous integral insulation |
| Finish | Galvanised steel with black powder coating |
Catnic CG70/100 sizes and safe working loads
The CG70/100's safe working load, nominal height and weight vary according to length. The table below covers all ten sizes we offer, using Catnic's published specifications.
| Length | SWL | Weight | Height |
|---|---|---|---|
| 900mm | 15kN | 5.71kg | 136mm |
| 1200mm | 15kN | 7.65kg | 136mm |
| 1500mm | 15kN | 9.44kg | 136mm |
| 1800mm | 18kN | 13.93kg | 136mm |
| 2100mm | 20kN | 17.48kg | 155mm |
| 2400mm | 22kN | 21.35kg | 175mm |
| 2700mm | 26kN | 27.42kg | 215mm |
| 3000mm | 26kN | 37.85kg | 216mm |
| 3300mm | 26kN | 41.59kg | 216mm |
| 3600mm | 26kN | 45.33kg | 216mm |
Where to use a Catnic CG70/100 lintel
The CG70/100 is designed for openings in standard duty masonry cavity wall construction with a 70–85mm cavity. It can support typical masonry loads and specified timber floor and roof loads where the selected lintel's capacity is sufficient.
Its open-back profile allows masonry to be built continuously on both leaves and is suitable for fair-faced inner leaf masonry.
Choosing the correct CG70/100 length
Catnic's published loading figures use nominal 150mm end bearings at each end. The required lintel length is therefore normally determined by adding 300mm to the clear structural opening width.
For example, a 1200mm opening would normally require a 1500mm lintel, allowing 150mm bearing on each side. Check the applicable safe working load before ordering.
Installation considerations
Check the cavity width, masonry leaf dimensions and supporting wall construction before installation. Follow Catnic's current guidance for end bearings, temporary support where required and any additional damp-proofing measures.
Related Catnic cavity lintels
For narrower cavity walls, compare our Catnic CG50/100 Standard Duty 50mm Cavity Lintel, designed for 50–65mm cavities.
For wider cavities, we also supply the Catnic CG90/100 Standard Duty Cavity Lintel, designed for 90–105mm cavities.
Browse our cavity lintel range and Catnic lintels for other dimensions and loading requirements.
Technical downloads
Frequently asked questions
What cavity width is the Catnic CG70/100 designed for?
The CG70/100 is designed for 70–85mm cavities, with a 100–115mm inner masonry leaf and a 100–102mm outer leaf.
What lengths of Catnic CG70/100 do you supply?
We offer ten lengths from 900mm to 3600mm. Choose the size you need from the options above.
What safe working load can the CG70/100 support?
The safe working load depends on length. Catnic specifies 15kN for 900–1500mm, 18kN at 1800mm, 20kN at 2100mm, 22kN at 2400mm and 26kN for 2700–3600mm, subject to its published loading conditions.
Does the CG70/100 have a built-in DPC?
Yes. The CG70/100 incorporates a built-in damp-proof course. Additional DPC may be required in some installation or exposure conditions.
Does the CG70/100 have insulation and a plaster key?
Yes. It includes continuous insulation to help reduce thermal bridging and an integral plaster key to assist plaster finishing.
How much end bearing does a CG70/100 need?
Catnic's published loading figures are based on nominal 150mm end bearings at each end. Confirm the required lintel length and loading capacity before installation.
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