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Heavy Duty Cavity Wall Lintel 

Cavity: 70-65mm

Outer Leaf: 100mm

Inner Leaf: 100mm 

Must have solid, fully jointed blockwork infill to inner leaf.



  • Supergalv coating offers a superior life expectancy
  • Birtley lintels have been tested to BS 476-20:1987 to determine the fire resistance 
  • On top of our Industry-leading performance, you’ll also enjoy the unlimited support of our entire technical team, free of charge. 


Length 750-1800 1950-2400 2550-2700 2850-3000 3150-3300 3450-3900 4050-4200 4350-4800 4950-5100
L (kN) 70 60 60 55 50 45 40 35 25
W (kg/m) 9.7 12.5 17.6 17.6 17.6 17.6 17.6 17.6 17.6
H (mm) 154 155 232 232 232 231 232 232 232

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

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Brand Birtley
Generic Ref HD70
Product Range Cavity Wall Lintels
Product Sub-range 70-85mm Cavity
Product Type Heavy 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)
DoP Ref BIR531CPR2014
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
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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