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Heavy Duty Cavity Wall Lintel 

Cavity: 70-85mm 

Wide Outer Leaf: 124-140mm

Inner Leaf:  100mm

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



  • Supergalv coating offers superior life expectancy
  • Lack of baseplate and factory fitted insulation reduces thermal bridging
  • Our in-house team of accredited thermal modellers will carry out bespoke thermal bridging assessments on request


Length 750-1800 1950-2700 2850-3000 3150-3600 3750-4200 4350-4800 4950-5100
L (kN) 70 60 55 45 40 35 25
W (kg/m) 17.7 17.7 17.7 17.7 17.7 17.7 17.7
H (mm) 231 231 231 231 231 231 231

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


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Brand Birtley
Generic Ref HD125/70/100
Product Range Cavity Wall Lintels
Product Sub-range 70-85mm Cavity Wide Outer Leaf
Product Type Heavy Duty Cavity Wall Lintel - 100mm Inner leaf/125-140mm 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 Wide inner leaf to suit 125-140mm block
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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