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BS 5628-3 PDF

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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Where their use is unavoidable, panels of slips should be isolated from movement and stresses in adjoining masonry. Few natural stones will not give adequate service between eaves and DPC in buildings of domestic scale. Particular attention should be paid to jointing.

BS 5628 Part 3 Masonry

The recommendations above are for finished work; during construction, masonry units, mortar and recently finished work may need protection see BS Therefore, recessed joints are not recommended for external work using clay bricks of the moderate frost resistant category M specified in BS Figure 24 illustrates typical arrangements.

They should not be regarded as defining acceptability of appearance. If necessary during construction, temporary support for masonry sb be used, e.

Protect the bottom of the stack from becoming wet from ground moisture. These mortar Designations are often used in conjunction with dense, low water absorption clay bricks. This standard is not necessarily appropriate to the repair and restoration of old buildings.

Proportions should be consistent from batch to batch of mortar. The condition of masonry units at the time of delivery can impose requirements on site before use see A. However, when the surface of the material approaches saturation point water tends to run more readily down the surface and, as in walls of dense units, can penetrate via paths at the mortar joints.


Optimum performance in butt joints is obtained when the width to depth ratio of the sealant bead lies within the range 2: It is not intended that the voids in perforated bricks are filled with mortar.

If a bond breaker is necessary, it should be positioned between the filler material gs the sealant.

BS 5628-3:2005

Where no instructions are given, a minimum lap of mm should be used. A greater proportion of the water runs down the face of the walling and can be blown into and through it via paths in the 528-3 joints, particularly at the interface between the mortar and the masonry units see 5.

Bituminous materials bd DPCs in masonry built of some natural stones should be carefully selected to avoid the risk of staining.

Stack lintels and copings of precast concrete and pressed metal on level bearers so that they are clear of the ground. The other end is built-in but debonded to allow the joint to open and close while preventing movement in any other direction.

BS Part 3 Masonry – Free Download PDF

To sb existing thicker walls, or for decorative purposes, bond patterns incorporating headers may be used for half brick leaves, but they will require the use 56228-3 half-bricks, or bats, as the headers. BSThermal insulation of cavity walls using man-made mineral fibre batts slabs — Part 1: It is worthwhile identifying the problem before deliveries begin and consulting the manufacturer.


It should be assumed that moisture runs down the inner face of the external leaf of all cavities.

Limit lengths to 1. DPC Designation 1 bricks are required for buildings. Certain types of cellular, frogged or hollow unit which are otherwise suitable for the construction of the wall may not provide sufficient bearing strength at points of concentrated load and may need to be filled. As a code of practice this part of BS takes the form of guidance and recommendations. In effect, the air bubbles serve to increase the volume of the binder paste, filling the voids in the sand, and this improves the working qualities.

This airspace should be of a minimum target width of 50 mm. Bricks of 55628-3 FN are only recommended when sulfate-resisting Portland cement is used for the jointing and rendering mortar.

Suitable minimum lengths are given in Table BSSpecification for dimensions of bricks of special shapes and sizes. Sealant selection should be in accordance with the recommendations given in BS


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