| Health and Safety Regulations (COSHH) |
Prestressed Concrete Lintels (13Kb Adobe Acrobat Format - PDF)
L-Strip Steel Lintels (12Kb Adobe Acrobat Format - PDF) |
| Installation |
Concrete Lintels
All Hi-Spec, Fire-Spec and Fair Faced Naylor lintels are market 'TOP'. This surface should remain uppermost at all times. It is important that lintels are installed the correct way up. If the mark 'TOP' cannot readily be seen, the lintels should be built-in in such a way that the reinforcing strand (visible on the end faces) is in the bottom of the unit.
Naylor Economy Lintels are fully reversible and may be installed any way up.
Lintels should be carefully bedded on a full mortar joint.
Wall ties should be positioned in accordance with current building regulations.
A damp proof course should be used for all lintels in external walls, and must be fixed in accordance with building regulations.
In cavity construction, it is recommended that both internal and external leaves are taken up uniformly.
For spans in excess of 1200mm, it is good practice to provide temporary support (at 1200mm centres). If lintels are supporting concrete floor load, a minimum lintel depth of 140mm is recommended to allow for impact loads during the actual placing of concrete flooring.
L-Strip Steel Lintels
A thin mortar bed should be placed in the reveals of the external leaf and the L-Strip bedded onto this. For spans in excess of 1200mm, temporary support (at 1200mm centres) should be provided until the first few courses of masonry have matured: window and door frames are normally sufficient for the particular purpose. Wall ties should be positioned in accordance with current building regulations.
Stacking
Timber bearers should be located near the ends of the lintels and placed vertically in line. For those lintels marked 'TOP', it is important that these are stacked the correct way up on firm ground.
Cutting
Concrete lintels may be cut using a high speed disc cutter. Use of this should by a properly trained operative taking due regard of current Health and Safety regulations.
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| Quality Standards |
The design of Naylor prestressed concrete lintels complies with BS8110 part 1:1997: section 4.
Naylor lintels are manufactured in accordance with BS5977: part 2:1983.
Materials used in the manufacture of Naylor prestressed lintels comply with BS12 and BS882. The prestressing strand/wire complies with BS5896.
Naylor lintels have a low water absorption and as a result of the quality controlled Hi-Spec dense concrete mix used in their manufacture, they can therefore be used underground provided that the ends of the lintels have a minimum 45mm cover of mortar to the ends of the reinforcing strands.
L-Strip lintels are manufactured from steel strip complying with BS EN 10025 with the minimum yield stress of 175 N/mm2. Zinc coating is galvanised to BS2989Z2. L-Strip is also produced in austenitic stainless steel conforming to grade 304:S15:BS1449: part 2.
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| Lengths |
Naylor lintels are available as standard in lengths from 600mm to 3600mm. Longer and intermediate lengths are available on request.
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| Scope of Manufacture |
Limitations:
Weight: max 4 tonne
Width: max 2 metre
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| 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.
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| Technical Services |
| A free design and technical service is available and advice is gladly given for particular requirements and applications. Lintel schedules and calculations where required, can be provided from working drawings.
Naylor lintels can be specified from the NBS Plus Clauses F30: 740 and F30: 750 |
