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CB70

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CB70

Standard Duty Cavity Wall Lintel 

Cavity: 70-65mm

Outer Leaf: 100mm

Inner Leaf: 100mm 

Not suitable for point loads or concrete floors. 

 

Features  

  • Supergalv coating offers superior life expectancy
  • Birtley lintels have been tested to BS 476-20:1987 to determine the fire resistance 
  • Lack of baseplate and factory fitted insulation reduces thermal bridging

 

Length 750-1200 1350-1500 1650-2100 2250-2400 2550-3000 3150-3900
L (kN) 15 15 20 22 26 26
W (kg/m) 5.8 7.1 8.3 10.1 11.5 14
H (mm) 108 108 143 148 185 201

(L) Load SWL/UDL value (W) Weight (H) Height 

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Brand Birtley
Generic Ref CB70
Product Range Cavity Wall Lintels
Product Sub-range 70-85mm Cavity
Product Type Standard Duty Cavity Wall Lintel - 100mm Inner leaf/100mm Outer Leaf
European Standard/ETA BS EN845-2:2013+A1:2016
Test Standard EN846-9:2000/2016
Notified Body Lucideon Ltd (NB 1289)
Material Mild Steel S275JR to BS EN10025-2:2004
Coating/Finish/Colour 65µm Hot Dip Galvanized to BS EN ISO 1461:2009
Thermal Performance Contact us for information
Insulation Expanded Polystyrene - BREEAM rating A+
Fire Rating 60 mins (with 2 coat plaster finish)
1. Installation requirement Bed fully on bricklaying mortar
2. Installation requirement Must be used with a cavity tray - External walls only
3. Installation requirement Not suitable for point loads or concrete floors
4. Installation requirement 150mm Minimum end bearing
Sales Qty 1
Packaging weight 0
1. Features Supergalv coating offers superior life expectancy
2. Features Post-fabrication galvanizing leaves no surface with inferior paint protection
3. Features Lack of baseplate and factory fitted insulation reduces thermal bridging
4. Features Structural grade steel to EN10025
5. Features Plaster key to inner leaf
Option 1 Alternative material options: Ultragalv coating (150µm), Stainless Steel 1.4301 (304)
Option 2 Outer Leaf Options: Reduced length flange (RFF), No rainwater drip (ND), Render mesh (MF)
Option 3 Inner Leaf Options: No plaster key (NM), Closer plate (CP)

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Products in Our Range

Part of the Birtley Group

Birtley began life as Birtley Building Products in 1965, based at the current site in County Durham. Originally a steel fabricator for the area’s mining and power generation industries, the company made its first steel lintels in 1967. Since then, Birtley has grown from reliable local supplier to a UK-wide force in construction design technology and product development.

In 1889, the British Metal Expansion Company was established in Hartlepool. It had sole European rights for the manufacture of expanded metal mesh, mainly for use as reinforcement and lath in the rapidly expanding sector of concrete construction. The business that grew from these early days later changed its name to Expamet.


Acquired by Birtley Group in 2015, Bowater Doors is a nationally-known name synonymous with top quality and imaginative composite residential door design and manufacture.

The product portfolio offers exclusive ranges for trade installers and a retail range providing doors direct to consumer and social housing organisations.

Birtley Galvanizing boasts one of the most impressive galvanizing plants in Europe. The plant achieves the finest quality hot-dip galvanized zinc protective coatings to BS EN ISO 1461. Using state-of-the-art technology the plant processes steel products using a computer controlled, automated handling system, enabling Birtley Galvanizing to provide full project solutions to many industries.