![]() In-Situ Concrete: Should comply with I.S. ![]() 1:1:6 Cement/lime/sand or 1:6 Cement/sand (with plasticiser). EN 998-2: 2016 Specification for mortar for masonry - Part 2: Masonry Mortar. EN 771-3: 2011 +A1 2015 Specification for masonry units Part 3: Aggregate concrete masonry units (Dense and light-weight aggregates). EN 845-2 2003 + A1 2013 Specification for ancillary components for masonry – Part 2: Lintels.Ĭoncrete Blocks: Should comply with I.S. ![]() Lintels should be manufactured in accordance with I.S. Table C1 - Typical prestressed lintel specificationĭiagram C8 - Measurement of roof and floor spans for determining floor and roof loads It should be noted that a lintel is deemed to have no strength prior to blockwork or in-situ concrete being built above it. This is the where the terms ‘composite lintel’, ‘compression blockwork’ and ‘compression zone’ come from. The prestressed lintel, much like the steel in a reinforced beam, resists the tensile force while the blockwork resists the compressive force. In a composite lintel, the prestressed lintel works with a zone of blockwork or in-situ concrete laid on top to provide support. ![]() The guidance detailed below should be followed when designing and constructing composite lintels from prestressed concrete lintels acting together with solid block or in-situ concrete. The details shown below apply to detached houses.ĭiagram C4 - Typical cavity closing details - metal lintel closerĭiagram C5 - Typical cavity closing details - plasterboard closerĭiagram C6 - Typical cavity closing details - cavity closer blockĭiagram C7 - Typical cavity closing details - cill Where a separating wall meets an external wall, the junction should be fitted with a cavity barrier in accordance with Diagram 12 of Technical Guidance Document B 2017 or where no cavity exists, maintain the fire resistance of the separating wall, or in the case of external insulation systems a fire stop within the insulation in the plane of the separating wall. Around all openings (windows, doors, vents, service boxes etc.) in framed construction.Above the enclosures to a protected stairway (see Diagram 11 of TGD B see Section H of this app).Vertically at the junction of separating wall and any such wall with an external cavity wall (see Diagram 12 of TGD B see Section H of this app).At the top of an external cavity wall (masonry or framed construction) including any gable wall.Weep-holes must be provided at 450 mm centres where the outer leaf is brickwork or fair faced concrete.Ĭavity barriers should be provided to fire stop around openings in cavity walls in accordance with the following: Manufacturer’s requirements should be checked for bearing conditions. Typical minimum bearing and DPC requirements are illustrated.ĭiagram C1 - Typical pressed metal lintel detailĭiagram C2 - Typical pressed metal lintel - span is less than 2.25mĭiagram C3 - Typical pressed metal lintel - span is greater than 2.25m With regard to corrosion protection, end bearing, load, water ingress, load capacity, fire and thermal properties, the manufacturer’s instructions as set down in the appropriate agreement certificate should be adhered to while installing. The engineer used must be qualified by examination, be in private practice, and possess professional indemnity insurance. In cases where the lintel span is greater than 3m, design by an engineer may be necessary. Refer to Technical Guidance Document A of the Building Regulations for more information and guidance. High stress in masonry can be caused by narrow piers between openings, the width of these piers needs to be controlled. Lintels must be used above doors and windows, as the frames alone are not capable of carrying the load. The purpose of lintels is to provide carry the masonry above an opening in a wall, and transmit the load to the wall either side of the opening.
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