Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic
Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic
Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic
Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic
Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic
Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic
Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic
Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic
Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic
Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic
Lintel Type : Cavity Lintels
Cavity Width : 70-85mm
Lintel Duty : Extra Heavy Duty
Thermally Broken : No
Wide Inner Leaf? No

Catnic

Catnic CX70/100 Extra Heavy Duty 70mm Cavity Lintel

£105.00
Cavity Lintel

£87.50 (ex VAT)

Length

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The Catnic CX70/100 Extra Heavy Duty 70mm Cavity Lintel is designed for high-load masonry cavity wall construction with a 70–85mm cavity, a 100–115mm inner leaf and a 100–102mm outer leaf. Its open-back steel profile supports specified masonry, floor and roof loads, while continuous insulation, an integral plaster key and built-in DPC provide practical construction benefits. We supply 15 lengths from 900mm to 4200mm, with safe working loads from 32kN to 60kN depending on length.

Catnic CX70/100 key features

Extra heavy duty loading

Designed for structural cavity wall openings, with safe working loads up to 60kN depending on length.

70–85mm cavity walls

Suitable for a 100–115mm inner masonry leaf and a 100–102mm outer leaf.

Open-back profile

Allows masonry to be built up continuously on both leaves and is suitable for 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 plaster key assists plaster finishing.

Duplex corrosion protection

Manufactured from galvanised steel with Catnic's protective black polyester powder coating.

Dimensions and specification

Catnic CX70/100 technical specifications
Manufacturer Catnic
Product code CX70/100
Lintel type Extra heavy duty cavity wall lintel
Cavity width 70–85mm
Inner leaf 100–115mm
Outer leaf 100–102mm
Available lengths 900–4200mm, 15 sizes
Manufacturer's length range 900–4800mm
Nominal section height 232mm
Nominal end bearings 150mm at each end
Safe working load 32–60kN, 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 CX70/100 sizes and safe working loads

The CX70/100's safe working load varies according to lintel length. The following table covers all 15 sizes we offer, using Catnic's published loading figures and nominal weights.

CX70/100 length, safe working load and nominal weight
Length Safe working load Weight
900mm 60kN 14.72kg
1050mm 60kN 17.18kg
1200mm 60kN 19.63kg
1500mm 60kN 24.54kg
1800mm 60kN 29.45kg
1950mm 60kN 31.90kg
2100mm 60kN 34.36kg
2400mm 60kN 39.26kg
2550mm 60kN 41.72kg
2700mm 60kN 44.17kg
3000mm 55kN 49.08kg
3300mm 50kN 65.51kg
3600mm 50kN 71.46kg
3900mm 50kN 77.42kg
4200mm 32kN 83.37kg

Where to use a Catnic CX70/100 lintel

The CX70/100 is intended for extra heavy duty masonry cavity-wall construction with a 70–85mm cavity. It supports specified masonry, timber floor and roof loads, including suitable concrete floor and attic truss loading arrangements where the structural design permits.

The open-back profile allows both masonry leaves to be built up continuously and is suitable for fair-faced inner leaf masonry.

Choosing the correct CX70/100 length

Catnic's published loading figures use nominal 150mm end bearings at each end. As a general starting point, add 300mm to the clear structural opening width to allow these bearings.

For example, a 1200mm opening would normally require a 1500mm lintel, with 150mm bearing at each end. The selected lintel must also provide sufficient safe working load for the intended construction.

Installation and support requirements

Both masonry leaves should be raised together, and the supporting wall construction must provide suitable end bearings. Follow Catnic's current installation guidance for temporary propping, load transfer and lateral restraint during construction.

For concrete floor applications using Catnic CH and CX open-back lintels, the blockwork must be built tightly against the inner vertical face. Catnic also requires a mortar joint at the top of the blockwork to distribute the floor-unit load evenly over the inner flange.

For lower loading requirements with the same cavity dimensions, compare our Catnic CH70/100 Heavy Duty Cavity Lintel or Catnic CG70/100 Standard Duty Cavity Lintel.

For extra heavy duty applications with a wider cavity, we also supply the Catnic CX90/100 Extra Heavy Duty Cavity Lintel, designed for 90–105mm cavities.

Browse our cavity lintel range and Catnic lintels for other models and specifications.

Technical downloads

Frequently asked questions

What cavity width is the Catnic CX70/100 designed for?

The CX70/100 is designed for 70–85mm cavities, with a 100–115mm inner masonry leaf and a 100–102mm outer leaf.

What lengths of Catnic CX70/100 do you supply?

We offer 15 lengths from 900mm to 4200mm. Choose the required size from the options above and check its safe working load before ordering.

What is the safe working load of the CX70/100?

Catnic specifies 60kN for lengths from 900mm to 2700mm, 55kN for 2850–3000mm, 50kN for 3300–3900mm and 32kN from 4200mm upwards, subject to its published loading conditions.

Does the CX70/100 have a built-in DPC?

Yes. The CX70/100 incorporates a built-in damp-proof course. Additional DPC may be required depending on installation and exposure conditions.

Does the CX70/100 have integral insulation and a plaster key?

Yes. The CX70/100 includes continuous insulation and an integral plaster key.

Can the CX70/100 support concrete floors?

Catnic provides installation requirements for concrete floors supported by CH and CX open-back lintels. Blockwork must be tightly built against the inner vertical face, with a mortar joint at the top to distribute loading evenly over the inner flange. The actual structural loads must also be checked.

How much end bearing does a CX70/100 need?

Catnic's published safe working loads use nominal 150mm end bearings at each end. Confirm the selected lintel length and loading capacity before installation.
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Catnic Extra Heavy Duty 70mm Cavity Lintel CX70/100 by Catnic

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