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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The use of these stones at the angles will give greater strength and stability to the wall, and enable the mason to course and plumb the wall as the work advances. Flexible cellular polyurethane, cellular polyethylene or foam rubbers are satisfactory materials. If weepholes are not specified obtain instructions.

However, masonry built of these units can be vulnerable to sulfates from other sources. Weepholes need not be provided if walls have a rendered external surface finish. Arrange deliveries so that the materials do not arrive at site too early and that excessively large quantities are not delivered at one time. Unreinforced concrete floors laid on the ground, or on fill, should not also bear on walls as this can give rise to cracking as a result of differential movement.

Whatever the type of masonry, filled cross and bed joints minimize the risk of rain penetration. Lay hollow blocks on shell bedding with the vertical joints filled.

Check materials for deterioration when taken out of storage and discard if lumpy. Unplastered walls in attics or roof spaces should be well built with all bed joints and cross joints filled with mortar.

This standard does not cover the use of natural stone panels as cladding to structural masonry and steel and 562-83 frames. Where necessary adjust the consistency of the mortar to suit the suction rate of the units.

Movement joints need not generally exceed 10 mm in width. The difficulties of determining the actual loads acting on arched openings formed within brick masonry walls means that accurate structural design is unlikely to be achieved.

Calcium silicate and concrete masonry do not contain soluble sulfates. Masonry is not completely free to expand or contract because restraints are often present, and thus compressive or tensile forces can develop and these can lead to bowing or cracking. This 6528-3 significantly affect the appearance of walling. Where floors are required to provide lateral restraint, the recommendations of BS When cavity fill insulation is installed, the tray should always slope or step down to the outer leaf.


Build in bonders, one to each superficial metre in each face in random work, and at approximately 1 m vertical and horizontal intervals in coursed work, staggering the stones between the two faces.

Those formed by raking out the mortar without subsequent tooling to firm its surface further increases the vulnerability of the wall to rain penetration. However, BS and BS cover the subject matter more comprehensively and include design, materials and other related aspects in addition to workmanship on site.

In selecting metal support and restraint component materials, Table 1, 5. In Table 14, mortar mixes are grouped in four Designations.

Protective measures for steel lintels, including provision of DPCs where appropriate, should conform to BS The joints in a sill are a source of weakness. Typical ways of connecting roofs with walls are shown in Figure 11, Figure 12 and Figure Water running off the window on to the sill can cause moisture to penetrate through the sill or joints and back, to any part of the inner leaf or finishes in contact with the sill without an adequate DPC see A.

Filling cavities below ground level stabilizes the two leaves and prevents the bottom of the wall filling with water. Where the compressive forces are applied eccentrically, e. BSSpecification for masonry cement.

Sealants should be installed in accordance with BS Where a mortar designation richer than the minimum Designation recommended for durability in Table 13 is required for structural reasons, careful consideration should be given to the accommodation of movement see 5. The best evidence of ability to withstand frost damage is provided by brick masonry which has been in service for some years.

Where a structural member bridges a cavity, a vertical DPC should be included between the structural member and the external leaf, and stop ends fitted to any adjacent cavity trays. NOTE 2 Air entrainment to improve the durability and the working properties of the mortar is recommended. Ascertaining in advance whether the manufacturer can blend the units in their factory is useful. Normally in brick masonry, open cross joints perpend joints or, in block masonry, 5628–3 open cross joints perpend joints serve as weepholes.


These 56288-3 may be reduced to 90 mm if the load is distributed over both leaves.

BS 5628-3:2005

Any water reaching the bottom of the cavity is drained away through weepholes left in the base of the wall see A. Where the abutment is horizontal a cavity tray with stop ends and weepholes should be used.

In such cases, consideration should be given to using sands having a particle distribution towards the coarser end of the BS and grading envelope. It should extend beyond the vertical DPC and cover any lintel. Careful consideration is necessary in deciding which way to slope the tray in a given case. BSThermal insulation of cavity walls using man-made mineral fibre batts slabs — Part 1: Spread only sufficient mortar to bed one ashlar at a time. In Figure 7, the encircled numbers labelling a feature refer to the figure showing the feature in more detail.

Recommendations for design of wall ties. BSSpecification for air-cooled blastfurnace slag aggregate for use in construction.

BS Part 3 Masonry – Free Download PDF

For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. If more rigid ties are used, or a greater number of ties per square metre are used, the sound insulation of the wall is reduced. 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. Finishes should be discontinuous at movement joints and slip planes, and fixings and fittings should not tie across joints.

The minimum thickness given is suitable for 75 mm brick-on-edge construction with a completely solid unit with plane faces.

Sealant selection should be in accordance with the recommendations given in BS Then add further water and mix to achieve the required workability.