Technical Information

The design of Naylor Prestressed Lintels complies with BS8110: part 1: 1997: Section 4.

Naylor lintels conform to BS EN845: part 2:2013.

Materials used in the manufacture of Naylor Prestressed Lintels comply with BS EN206 and BS8500.

The prestressing wire complies with BS5896.

Naylor Concrete Lintels have a low water absorption as a result of the dense concrete mix used in the manufacturing process.  They can be used underground providing that the ends of the units are encased in a minimum of 45mm of mortar to the ends of the reinforcing strands.

All Naylor Lintels are wet cast and have a concrete strength of 50N/mm2.  They are suitable to accept fixings providing that the tendons contained inside the unit remain undamaged.

All fire rated lintels produced by Naylor Lintels comply with BS8110: table 4.3: section 2: 1985.

All L-Strip’s are manufactured from steel complying with BS EN10025 with a minimum yield stressed of 275 N/mm2.  Zinc coating is galvanised to BS2929z2.  Stainless Steel L-Strip’s are also produced conforming to grade 304:S15:BS1449: Part 2.

Naylor Concrete Products Ltd operate to Certified ISO 9001 quality assurance standards.


Naylor lintels are available in lengths from 600mm to 3600mm as standard.  Longer and intermediate lengths are available on request.

Scope of Manufacture

Fixings, channels, inserts etc. can easily be accommodated.  Recent projects have included lift shafts with cast in channels.

Load Bearing

Lintels are usually supplied with the following allowances for bearing at each end:

  • 100mm for openings up to/including 1000mm
  • 150mm for openings up to/including 3000mm
  • 200mm for openings over 3000mm

It is however, the responsibility of the building designer to ensure that these are sufficient to avoid over-stressing the masonry at the supports. Longer and intermediate lengths are available on request; bespoke lengths up to 4800mm.

Typical Projects

Typical projects where Naylor lintels are specified and used include:

  • Hospitals
  • Schools
  • Nursing Homes
  • Sheltered and Student Accommodation
  • Flats
  • Offices
  • Industrial Developments
  • Sports Stadia

Thermal Bridging

For further information on Thermal Bridging please contact the technical hotline 0800 5424192.

New Regulations

Implementation of the amendments to Parts E and L of the building regulations came into force in 2002.  Amongst the new measures it is required that the thermal bridging and fabric insulation be improved (Part L) and the required Resistance to Sound Reverberation, especially at low frequencies (Part E), be increased.

Compliance with the new requirements can easily be achieved using our HI-SPEC range of Lintels and L-STRIP.