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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Clay bricks of durability Designation MN are not recommended in this situation. Bonds that do not conform to this criterion, e. Expert advice should be sought regarding the selection of concrete masonry units when it is intended to use them where significant concentrations of sulfates could be sb, e.

The length of the tie should be sufficient to give a minimum embedment of 50 mm having regard to normal site tolerances for cavity width and centring of the tie. Bed at least one further course of units on mortar on the DPC.

BS Part 3 Masonry – Free Download PDF

Movement of the timber frame and movements of masonry in response to thermal and moisture changes are dissimilar. A simple support may be assumed where the wall is permitted to rotate but is restrained against lateral movement. Alternatively, the masonry may be designed as a structurally self-supporting wall.

Cavity tray overlaps in front of the vertical DPC. Do not load a mixer to more than its rated capacity. NOTE 1 Binders or other beams giving rise to concentrated loads on the wall may need to be provided with a padstone bz spreader beam see 5.

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. In practice, the designer has the following three options: At the vertical edges of openings and at vertical unreturned or unbonded edges e.

The varieties are determined by the type of stone available and the way in which it comes from the quarry or 562-83 be dressed: Examples of architectural features leading to increased local exposure are: Rendering can substantially enhance the rain resistance of single-leaf and cavity walls. BSSpecification for polyurethane PUR foam systems suitable for stabilization and thermal insulation of cavity walls with masonry or concrete inner and outer leaves.


Overlap joints in DPCs to a minimum of mm and seal with an appropriate jointing compound; b securely fix trays across the cavity, stepping up towards the inner leaf.

Where mixing by hand, mix the cement and lime, if used with sand before adding water until the colour is consistent. Build bss front part of the wall to a height of not more than mm, raise the back part to approximately the same level using as far as possible stones that are broad on bed and which tail-in well with the front portion.

Paved surfaces adjacent to masonry should bbs laid to falls so that water is not bz to the masonry. The coursing of the ashlar can be regular or random but should relate to the coursing of the backing to prevent unnecessary 5628- of the backing units.

Add the final quantity of water to achieve the correct workability. Detailed commentaries on the protection afforded by projecting features such as sills, copings, string courses, roof eaves and verges, and on the concentration of surface run-off of rain water by wind are contained in BS The inner leaf of a cavity wall should not be relied upon to resist water penetration.

BS 5628-3:2005

In wintry weather take precautions to prevent damage to the stones from the freezing of rainwater or residual quarry-sap by covering with tarpaulins or polyethylene sheet over straw, hessian or other suitable insulating materials, which contain nothing that might damage or stain the stone. Where necessary, slip ties or bss strong enough to provide lateral stability should be incorporated.

Closer spacing may be necessary for walls which are less well restrained, e. The bond should be transverse across the thickness of the wall and longitudinal along both faces of the wall. The use of a coping is BS or BS ; or preferable.

Where the design relies on flexural strength and no guidance is given in BS on the adhesion characteristics of the particular masonry units and mortar Designations, the adhesion should pass the preliminary tests as described in BS A British Standard does not purport to include all the necessary provisions of a contract.


It is not practical to vertically align every perpend joint, particularly with bricks having the maximum permissible deviation from the work sizes.

BS 5628 Part 3 Masonry

BSSills and copings — Part 1: 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. Exposure categories defined in terms of wall spell indices calculated using the local spell index method specified in BS are given in Table They should not be regarded as defining acceptability of appearance. Handle prepacked masonry units with wrapping and banding in place unless it is not practical to do so.

The sound insulation of a single-leaf masonry wall is largely related to its mass per unit area, provided that there are no direct air paths through it.

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 its adhesion to them. The latter is more important 5628-33 the uppermost storeys of loadbearing walls or where arched brick masonry openings are provided in any storey height of a framed structure where the brick masonry is not self-supporting.

To prevent the transfer of moisture from external walls into solid floors, the damp-proof membrane in the floor, and the DPC in 5682-3 wall, should overlap a minimum of mm or be sealed. Ns construction, buildings are subject to small dimensional changes, which can be caused by one or more of the following factors: Wherever possible, all features should be designed to fit with the masonry in length, height or thickness. Thicknesses given here are minimum thicknesses for each leaf in millimetres mm.