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It supersedes BS and BS , which are withdrawn. This edition of BS is a full revision of the standard. BS is published in the following parts: Part 1: Structural use of unreinforced masonry; Part 2: Structural use of reinforced and prestressed masonry; Part 3: Materials and components, design and workmanship. Annex A to this standard repeats the content of BS in order to provide designers with the recommendations for basic workmanship necessary in order to achieve the design recommendations of this standard. At the time of publication of BS , ordinary European Standard specifications ENs for masonry products have not yet been published as British Standards. Some have, however, been ratified by CEN.
Author: Nagis Kajitilar
ISBN: 428-2-48359-792-7
Vudojar If masonry cladding is built-in tightly between horizontal beams or floor slabs, these opposing movements can cause excessive stresses in the masonry, particularly if there is eccentricity, e. Reference to experience of durability in service of masonry units and mortar produced from local constituent materials in the geographical area concerned can provide valuable guidance.
Face insulated masonry units should be used with a retained air space. Thermal insulation Continuous angle Cavity tray Weepholes at a maximum of 1 m intervals horizontally Pistol brick to reduce joint thickness on face Sealant Compressible joint filler Figure 16 — An example of a support system showing provision for movement With cladding of calcium silicate or concrete masonry the differential movement between the cladding and the concrete structure is less.
Perlite may be substituted for vermiculite for clay bricks and other materials with similar surfaces. Code of practice for installation of batts slabs filling the cavity. Where necessary, slip ties or dowels strong enough to provide lateral stability should be incorporated.
Where hollow blocks are used in external walls, the use of shell bedding bz reduce rain penetration. BSPrecast concrete masonry units — Part 1: Stack small quantities of cement and hydrated lime intended for immediate use, if stored in a shed or building, on a timber platform, well clear of the ground. When more detailed information is needed on basic data and design to accommodate movement, see Annex B. This movement will be in opposition to thermal expansion of the cladding.
Tooling of the joints to compact the mortar helps to improve the durability of the mortar and the rain-shedding capacity of the wall see 5. This time ranges from 30 min to 6 h and is a property of the complete element of Hard, impervious pointing mortar should not be applied to joints made weaker, porous mortar. The length of the tie should be sufficient to give a embedment of 50 mm having regard to normal site tolerances for cavity width and centring of the tie.
If pointing is specified, rake out the joints to a depth of between 10 mm and 15 mm as the work proceeds, to give an adequate key. DPCs of clay units are unlikely to be suitable for walls of other masonry units, as differential movement can occur see 5. The designer may vary the length in particular circumstances, provided that the design recommendations continue to be met.
NOTE 1 Binders or other beams giving rise to concentrated loads on the wall may need to provided with a padstone or spreader beam see 5. BSCeramic floor and wall tiles. Consideration should be given to non-combustible strips fixed to both faces of the wall on one side of the joint. Window reveals should be sealed to prevent direct transmission along the cavity.
BS Part 3 Masonry — Free Download PDF The cavity tray over the opening should overlap the vertical DPCs at the jambs to ensure continuity of damp-proof measures see Figure Effectiveness of stress relieving of cold formed components to be tested by the supplier using the mercurous nitrate test described in BS EN ISO Low temperatures alone do not damage masonry, but bx it is saturated, or near saturated, the water can freeze to form ice within the fabric.
The designer should ensure that the construction selected does not conflict with other recommendations of this code. This keeps cutting of units to a minimum and avoids irregular or broken bonds. Specification for air-entraining plasticizing admixtures. Specification man-made mineral fibre batts slabs. DPCs and cavity trays should not be pierced by services, reinforcement, fixings, etc. It is important to weight the covers to prevent the wind lifting them. Vertically align the perpend joints in faced work.
These should be more regular in shape and more carefully dressed than stones for the main walling, and should be selected and out on the ground beforehand.
When used as a cavity tray, occurring up to the point of failure of the pre-formed cloaks should be used, e. Where the coping or capping is jointed, a continuous DPC should be provided.
Where a column, or other structural member, obstructs the cavity of a wall, the cavity tray should be continuous around the member. It should be assumed that moisture runs down the inner face of the external leaf of all cavities. When but this is unlikely to efficiency if the used as a cavity tray, bitumen remains affect resistance to the DPC should be moisture penetration undisturbed. It should not be quoted as though it were a specification and particular care should be taken to ensure that claims of compliance are not misleading.
Nelkree This can affect the choice of materials including insulation see 5. If sulfate ground conditions exist the b made with dense recommendation in 5. However, in practice, some partially filled joints are unlikely to lead to a significant reduction in performance. Sealants should be installed in accordance with BS At the vertical edges of openings and at vertical unreturned or unbonded edges e. Code of practice for masonry chimneys and flue pipes.
There are three parts tothe British standard as follows:Part 1: Structural use of unreinforced masonryPart 2: Structural use of reinforced and prestressed masonryPart 3: Materials and components, design and workmanshipThe Standard sets out the minimum requirements for the design and construction of masonry,including unreinforced, reinforced and prestressed, using manufactured units of clay, calciumsilicate and aggregate concrete laid in mortar, autoclaved aerated concrete AAC laid in thin bedmortar, manufactured stone masonry units and natural stone masonry units laid in mortar, andbricks of special shapes and sizes. Each Part of the Standard is a comprehensive document of about 70 pages arranged in thefollowing Sections: Part 1: Structural use of unreinforced masonry Section 1. Design: objectives and general recommendations Clause 15 Basis of designClause 16 Stability Design: accidental damage Clause 33 Design - accidental damage ScopeClause 2. Terms and definitions 3. SymbolsClause 5.
Vudojar If masonry cladding is built-in tightly between horizontal beams or floor slabs, these opposing movements can cause excessive stresses in the masonry, particularly if there is eccentricity, e. Reference to experience of durability in service of masonry units and mortar produced from local constituent materials in the geographical area concerned can provide valuable guidance. Face insulated masonry units should be used with a retained air space. Thermal insulation Continuous angle Cavity tray Weepholes at a maximum of 1 m intervals horizontally Pistol brick to reduce joint thickness on face Sealant Compressible joint filler Figure 16 — An example of a support system showing provision for movement With cladding of calcium silicate or concrete masonry the differential movement between the cladding and the concrete structure is less.