Follow these instructions for the successful installation of concrete lintels.

Concrete Lintels

All Hi-Spec, Fair Faced and Fire Spec lintels are marked ‘TOP’. This surface should remain uppermost at all times. It is important that the lintels are installed the correct way according to the load bearing situation. If the mark ‘TOP’ cannot be seen then the unit should be placed so that the reinforcement strand is close to the bottom of the unit and away from the load that is imposed.

Naylor Economy range is fully reversible and can be installed in either direction. As a consequence these units are not marked.

All lintels should be bedded on a level full mortar bed.

All wall ties, damp proof courses and weep vents should comply with the current building regulations.

Where possible it is advised that on cavity wall construction that both internal and external leaves should be built uniformly.

If lintels are supporting concrete floor check the correct unit has been installed. Take all necessary measures to avoid impact loading of lintels during placing of floor units and any sideways loading during adjustment of floor units. Naylor cannot be held responsible where a lintel depth supporting concrete floor/roofs is specified less than the recommended 140mm.

Our engineers recommend that: No rebate must be formed/cut into lintels, or holes drilled for chemical anchors. Plugging and drilling is acceptable providing that the location of prestressing tendons is not compromised.

For spans greater than 1200mm, lintels should be adequately propped during construction at a maximum of 1200mm centres. Props should not be removed until the mortar has matured.

Hi-Spec Lintels must not be used in a cantilever situation unless specifically designed by a suitably qualified engineering professional.

Cutting

Prestressed concrete Lintels may be cut using a high speed diamond cutting disc. Use of such equipment should be by a properly trained operative who is aware of the health and safety requirements of the machine and the COSHH information for the product.

Under no circumstances should the Ultra-Fire Range of Lintels be cut down in size.

For Naylor Industries COSHH information which details Naylor Lintels Products, together with Handling and Storage please visit www.naylor.co.uk or call our technical hotline on 0800 5424192.

Lintel end bearing

Lintels are usually supplied with the following allowances for bearing at each end unless otherwise stated.

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

It is however the responsibility of the building designer to ensure that these end bearings are sufficient to ensure that there is no over stressing of the masonary at the supports.

Steel Lintels

All lintels should be bedded on a level full mortar bed. For spans greater than 1200mm temporary support should be used until the first 3 courses of masonary have matured sufficiently for the support to be removed. In certain cases the door frame, window frame or timber former for the opening are sufficient for this purpose but this is dependent upon the quality and material of the frame or former.

All wall ties, damp proof courses and weep vents should comply with the current building regulations.

Special Requirements

Should you have any special Lintel requirements that are not detailed in our standard range or wish to discuss any of our products in more detail please call our technical team on 0800 5424192 who will be more than happy to discuss your lintel requirements in more detail or arrange a visit to offer an appropriate solution.