BS Incorporating Corrigendum No. 1. 1 31 January See Committees responsible for this British Standard The. BS Code of practice for the use of masonry – Part 3: Materials and components, design and workmanship. amendments of BS Parts 1, 2 and 3 ‘Code of Practice for Use of Masonry’. Mortar Testing. All test cubes shall be made and tested in accordance with.

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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.


BS 5628-3:2005

The tooling involved in finishing joints such as those with bucket handled and struck weathered profiles firms the mortar, reducing its permeability at the surface, and pushes it tight to the masonry units, thereby improving 5268-3 adhesion to them.

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 55628-3 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.


BS 5628 Part 3 Masonry

BSFlue blocks and masonry terminals for gas appliances — Part 1: L-shaped copings and clip-over copings can be more satisfactory in some situations. 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 56288-3.

Hard, impervious pointing mortar should not be applied to joints made 568-3 weaker, porous mortar. The length of the tie should be sufficient to give a 568-3 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 56283 provided with a padstone or spreader beam see 5. BSCeramic floor and wall tiles.

Consideration should be given to non-combustible 5682-3 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.


When cement is supplied in bags it is preferable to use whole bags 568-3 cement for any one mix. 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 55628-3 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 5628- faced work. These should be more regular in shape and more carefully dressed than stones for the main walling, and should be selected and 56283 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.