Lintels

Lintel sizing depends on three critical factors:

1. Length:

• Measure the clear span (width of opening)

• Add minimum 150mm bearing at each end

• Example: 1200mm opening + 150mm + 150mm = 1500mm lintel

2. Width:

• Match the wall thickness

• For cavity walls, consider separate lintels or combined units

3. Height:

• Determined by load requirements

• Taller lintels carry heavier loads

• Our technical team calculates required height based on load

Bearing length is critical for structural safety:

Important considerations:

• Bearing ends must be on solid masonry, not on plaster or finishes

• Bearing area must have sufficient strength to support the load

• Longer bearings may be required for soft brick or block work

• Our technical team calculates exact bearing requirements for your loads

Lintels support multiple load types:

For standard residential openings, we provide lintels suitable for:

• Single storey: Cavity or solid wall to eaves level

• Two storey: Supporting one floor plus roof

For non-standard loads, please provide structural calculations to our technical team.

Proper installation ensures structural performance:

Step-by-Step Installation:

1. Prepare bearings: Ensure bearing areas are level, clean, and correctly positioned

2. Bedding: Apply mortar bed to bearing areas (full bed, not spot bedding)

3. Positioning: Place lintel with correct bearing at each end, level and square

4. Propping: For longer spans, provide temporary props until mortar cured

5. Build above: Continue masonry above lintel, ensuring full mortar joints

6. Curing: Allow minimum 7 days before removing props (longer for heavy loads)

Critical checks:

• Lintel must be installed the correct way up (reinforcement position)

• Bearings must be full width of wall

• Lintel must be level both along length and across width

Yes, cavity wall openings require special consideration:

Option 1: Separate Lintels

• Inner leaf lintel and outer leaf lintel installed independently

• Allows for thermal break between leaves

• Requires two lintels per opening

Option 2: Combined Lintel

• Single lintel spanning both leaves

• Provides continuous support

• May create thermal bridge (insulation required)

Option 3: Boot Lintel

• L-shaped profile supporting outer leaf

• Used with separate inner lintel

Our technical team can advise on the best solution for your cavity wall construction.

Precast concrete lintels offer superior durability and lower lifetime costs.