Lintel Installation Guide

717070

Installation GuidesCatnic is committed to trouble free installation

Installation Installing a cavity wall lintel 71Installing a lintel supporting a concrete floor 73Installing a timber frame lintel 74

Installing a Cavity Wall Lintel

In cavity walls, raise inner and outer

leaves supported by lintel together.†Ensure wall dimensions are correct.

Ensure that masonry overhang

does not exceed 25mm.

Masonry above lintels should be allowed

to cure before applying floor or roof loads.

Ensure lintel is level along its width.

Ensure lintel is fully beddedon bricklaying mortar.

Ensure lintel is level along its length.

Structural opening or clear span.

* For advice on installations where end bearings can be reduced to not less than 100mm, pleasecontact Catnic Technical Services Department on 029 2033 7900.

† Ensure no more than half the safe working load(SWL) is carried by the outer leaf where the lintelcarries an external cavity wall. The wall should alsobe restrained laterally near the top.

Outer LeafInner Leaf Cavity

Ensure a nominal150mm end bearingat each end.*

Do• Install a separate DPC in severe exposure conditions.

A Catnic Cougar Open Back lintel with an additional DPCmembrane installed in accordance with normal practiceprovides the best possible protection (page 76)

• Locate the window/door frame so that the drip on the frontof the lintel projects forward of the drip on the front of theframe. It is good building practice to insert a flexible jointbetween the lintel and the top of the frame

• Ensure that timber floor joists and roof trusses have a fullblock depth between them and the lintel flange on CougarOpen Back Lintels

• Refer to the Catnic ‘How to Install a Lintel SupportingConcrete Floors’ or the Steel Lintel ManufacturersAssociation guidelines (available on request) when using CH& CX Open Back Lintels to support concrete floors

• Consider the use of our soffit cladding for all coastal sites(refer to page 65)

Do not• Use damaged lintels

• Apply point loads without prior consultation. Where theloading or a substantial part of it is applied as concentratedloads, each concentrated load must be supported over alength of lintel of not less than 200mm. In such cases, thetotal loading must not produce bending moments or shearforces greater than those produced by the uniformlydistributed loads specified in the relevant data tables

• Allow blockwork to overhang the lintel by more than 25mm

• Apply concrete floor loads without ensuring that the total loads are checked by a structural engineer, or by CatnicTechnical Services

• Do not cut CG type lintels under any circumstances

• Apply point loads directly on lintel flanges

Ensure lintel isnot damaged.

717070

Installation GuidesCatnic is committed to trouble free installation

Installation Installing a cavity wall lintel 71Installing a lintel supporting a concrete floor 73Installing a timber frame lintel 74

In cavity walls, raise inner and outer

leaves supported by lintel together.†Ensure wall dimensions are correct.

Ensure that masonry overhang

does not exceed 25mm.

Masonry above lintels should be allowed

to cure before applying floor or roof loads.

Ensure lintel is level along its width.

Ensure lintel is fully beddedon bricklaying mortar.

Ensure lintel is level along its length.

Structural opening or clear span.

* For advice on installations where end bearings can be reduced to not less than 100mm, pleasecontact Catnic Technical Services Department on 029 2033 7900.

† Ensure no more than half the safe working load(SWL) is carried by the outer leaf where the lintelcarries an external cavity wall. The wall should alsobe restrained laterally near the top.

Outer LeafInner Leaf Cavity

Ensure a nominal150mm end bearingat each end.*

Do• Install a separate DPC in severe exposure conditions.

A Catnic Cougar Open Back lintel with an additional DPCmembrane installed in accordance with normal practiceprovides the best possible protection (page 76)

• Locate the window/door frame so that the drip on the frontof the lintel projects forward of the drip on the front of theframe. It is good building practice to insert a flexible jointbetween the lintel and the top of the frame

• Ensure that timber floor joists and roof trusses have a fullblock depth between them and the lintel flange on CougarOpen Back Lintels

• Refer to the Catnic ‘How to Install a Lintel SupportingConcrete Floors’ or the Steel Lintel ManufacturersAssociation guidelines (available on request) when using CH& CX Open Back Lintels to support concrete floors

• Consider the use of our soffit cladding for all coastal sites(refer to page 65)

Do not• Use damaged lintels

• Apply point loads without prior consultation. Where theloading or a substantial part of it is applied as concentratedloads, each concentrated load must be supported over alength of lintel of not less than 200mm. In such cases, thetotal loading must not produce bending moments or shearforces greater than those produced by the uniformlydistributed loads specified in the relevant data tables

• Allow blockwork to overhang the lintel by more than 25mm

• Apply concrete floor loads without ensuring that the total loads are checked by a structural engineer, or by CatnicTechnical Services

• Do not cut CG type lintels under any circumstances

• Apply point loads directly on lintel flanges

Ensure lintel isnot damaged.

Prop if necessary

• Check that the correct lintel is beingused according to the manufacturer’slintel schedule/design criteria

• Bed the lintel on full blocks and allowmortar to cure before applyingconcrete floor loads

• Raise both leaves of cavity walltogether and allow masonry to curesufficiently before applying heavyloads. Alternatively prop the lintel iflarge loads are to be applied to freshmasonry

• When using the Catnic CH & CXOpen back range with concretefloors, always ensure that theblockwork is built tight against theinner vertical face of the lintel, andthat a mortar joint is added to the topof the blockwork so that the floorunits have an even spread over theinner flange of the lintel

• Avoid shock loading lintels during theinstallation of concrete floor units andalso any sideways loading whilebeing lifted into position

• Precast flooring units should be laidon a mortar bearing of the full innerleaf wall width and should not be dragged over supports

• Avoid loading newly laid floors withbuilding materials

• Lintels must be built-in as illustrated,ensuring that the blockwork infill iswell-jointed during construction andcompatible with the strength of themasonry above

i.e. one row of blocks should be raised on the inner leaf, thenthree courses of brick on the outer leaf. Wall ties should thenbe installed and another row of blocks on the inner leaffollowed by three courses of brick on the outer and so on.

This process ensures that the lintel flanges are equally loadedand helps prevent rotation.

The open back lintel should also be suitably propped duringconstruction when being used with wide dense blocks.

Propping

• When propping, a horizontal boardshould be placed along the undersideof the lintel soffit, this will prevent anypoint loading, which could causelocalised deformation of the lintel.On small openings a single propshould be placed centrally within theopenings and wedged into place.The prop can be removed after thewall ties are effective. The number ofprops used should be increased forlarger openings.

• The 140 mm dense blocks should beinstalled tight against the inner webof the lintel.

• Therefore, the overhang of blockworkon the lintels inner flange could bemeasured at 15mm.

• If after considering the aboveinformation it is not practicable tocarry out the mentioned constructionprocess on site, we are able to offeran alternative box style lintel in placeof open back. These products aremore robust due to the design of thebox section and therefore, open togreater abuse on site during theconstruction stage.

Installing a Lintel Supporting Concrete Floors

Typical CX Lintel, supporting a concrete floor

Concrete floor

Lintel

Brick outer leaf

Block inner leaf

In addition to the Cavity Wall Installation Guide, please read the following for installing concretefloors with Catnic steel lintels

To ensure the flanges are equally loadedthe Code of Practice should be strictlyadhered to when building the masonry

Open Back - Wide Inner Leaf lintels used with 140mm dense blocks

Continuoussolid infill block

Prop centrally for spans up to2100mm. For larger spans useprops at 1200mm centres.

Prop if necessary

• Check that the correct lintel is beingused according to the manufacturer’slintel schedule/design criteria

• Bed the lintel on full blocks and allowmortar to cure before applyingconcrete floor loads

• Raise both leaves of cavity walltogether and allow masonry to curesufficiently before applying heavyloads. Alternatively prop the lintel iflarge loads are to be applied to freshmasonry

• When using the Catnic CH & CXOpen back range with concretefloors, always ensure that theblockwork is built tight against theinner vertical face of the lintel, andthat a mortar joint is added to the topof the blockwork so that the floorunits have an even spread over theinner flange of the lintel

• Avoid shock loading lintels during theinstallation of concrete floor units andalso any sideways loading whilebeing lifted into position

• Precast flooring units should be laidon a mortar bearing of the full innerleaf wall width and should not be dragged over supports

• Avoid loading newly laid floors withbuilding materials

• Lintels must be built-in as illustrated,ensuring that the blockwork infill iswell-jointed during construction andcompatible with the strength of themasonry above

i.e. one row of blocks should be raised on the inner leaf, thenthree courses of brick on the outer leaf. Wall ties should thenbe installed and another row of blocks on the inner leaffollowed by three courses of brick on the outer and so on.

This process ensures that the lintel flanges are equally loadedand helps prevent rotation.

The open back lintel should also be suitably propped duringconstruction when being used with wide dense blocks.

Propping

• When propping, a horizontal boardshould be placed along the undersideof the lintel soffit, this will prevent anypoint loading, which could causelocalised deformation of the lintel.On small openings a single propshould be placed centrally within theopenings and wedged into place.The prop can be removed after thewall ties are effective. The number ofprops used should be increased forlarger openings.

• The 140 mm dense blocks should beinstalled tight against the inner webof the lintel.

• Therefore, the overhang of blockworkon the lintels inner flange could bemeasured at 15mm.

• If after considering the aboveinformation it is not practicable tocarry out the mentioned constructionprocess on site, we are able to offeran alternative box style lintel in placeof open back. These products aremore robust due to the design of thebox section and therefore, open togreater abuse on site during theconstruction stage.

Installing a Lintel Supporting Concrete Floors

Typical CX Lintel, supporting a concrete floor

Concrete floor

Lintel

Brick outer leaf

Block inner leaf

In addition to the Cavity Wall Installation Guide, please read the following for installing concretefloors with Catnic steel lintels

To ensure the flanges are equally loadedthe Code of Practice should be strictlyadhered to when building the masonry

Open Back - Wide Inner Leaf lintels used with 140mm dense blocks

Continuoussolid infill block

Prop centrally for spans up to2100mm. For larger spans useprops at 1200mm centres.

Installing a Timber Frame Lintel

• When propping, a horizontal boardshould be placed along the flatunderside of the lintel soffit; this willprevent any point loading, whichcould cause localised deformation ofthe lintel flange.

• On small openings a single prop shouldbe placed centrally within the openingand gently wedged into place.

• The number of props should beincreased for larger openings.Generally props should be installed atmaximum centres of 1 metre.

• The prop can be removed after themortar has cured and the wall tiesbecome effective.

• A timber pinch batten should be fixedat the heel of the timber frame lintel inorder to minimise any rotation.

• Catnic timber frame lintels (e.g. CTF’s) are intended only tosupport an outer skin of brickworkwhere it is tied to an inner skin oftimber frame and must be suitablypropped during construction.

Note: lintels should be suitably propped during construction.Lintels for timber frame construction are supplied with lintelrestraint clips (free of charge), which must be screw or nailfixed to the timber frame to allow for differential movementbetween the timber structure and the brick facing.

Overall lintel length

Centre of lintel

Position of lintel restraint clips

Screw fixing

Nail fixing

Clearance

Lintel code Length (mm) Clip fixingsCTF5, 7 & 9 750-3600 50mm x 3.35mm diam. Plain head galvanised nailsCTF5, 7 & 9 3900-4800 38mm x No10 RD/HD sherardised wood screwsCN23 Up to 4800 38mm x No10 RD/HD sherardised wood screws

Lintel NumberLength (mm) of clipsUp to 1800 31950-3000 53300-4200 74575-4800 9

Typical application showing lintel over window

In addition to the Cavity Wall Installation Guide,please read the following for Catnic timberframe lintel installation

Technical Specifications & Quality AssurancesCatnic is committed to providing architects, designersand builders with useful information and terminologyrelevant to the specification of Catnic lintels

Specifications Where to use a separate DPC 76Quality Assurance 77Technical Information 78The Environment 79Guide to safe storage and handling 80Material Specification 81Glossary of technical terms 82

Lintel Installation Guide

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