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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Lay hollow blocks on shell bedding with the vertical joints filled. NOTE 2 Where detailing the bearings of flat roofs upon walls, the danger of displacement of the top courses of masonry as a result of thermal movements in the roof and deflection of the structure should be taken into account.

BSPulverized-fuel ash. Window reveals should be sealed to prevent direct transmission along the cavity.

Where the cavity is unavoidably bridged, e. BSCode of practice for thermal insulation of cavity walls with masonry or concrete inner and outer leaves by filling with urea-formaldehyde UF foam systems. The designer should ensure that the construction selected does not conflict with other recommendations of this code. A simple support may be assumed where the wall is permitted to rotate but is restrained against lateral movement.

Keep the cavity and ties free from mortar and debris. Mortars incorporating both lime and air-entrainment can be used with any sands within the BS and gradings. A greater choice is obtained by more specific assessment using BS However, it is expected that: Connections of other elements with the walls should be sufficient so as to transmit all vertical and lateral loads safely to the foundations. These restrictions avoid the risk of attack by run-off from limestone and concrete, respectively.

In these situations consideration should be given to the use of strong mortar mixes using Portland cement or sulfate-resisting Portland cement. NOTE 2 Ready-to-use building mortars are factory made mortars which contain cement set-retarding admixtures. From the description of the raincoat effect and the overcoat effect see 5. However, in practice, some partially filled joints are unlikely to lead to a significant reduction in performance.

Suitable minimum lengths are given in Table It is not practical to vertically align every perpend joint, particularly with blocks having the maximum permissible deviation from the work sizes. Masonry materials are far less prone to problems on a site that is well drained and dry. Draw battens should be used as a means of keeping the cavity clear of mortar and debris since anything that bridges the cavity can lead to damp patches appearing on the inner face of the wall.


Where FN clay units are used in Designation ii mortar for C2, sulfate-resisting cement should be used see 5. Prevent sagging by providing support where necessary; c ensure that trays cover the full extent of any lintels or other cavity bridgings; d ensure that trays with stop ends to direct water flow to weepholes are provided. In such cases more durable masonry units and mortar should be selected, and this can in turn govern the choice for the whole building. These covers should be kept handy for use.

BS 5628-3:2005

Where the abutment is horizontal a cavity tray with stop ends and weepholes should be used. Movement joints need not generally exceed 10 mm in width. Where their use is unavoidable, panels of slips should be isolated from movement and stresses in adjoining masonry.

In this area masonry will become wet As for A1 in ii or iii and can remain wet for long periods of time, particularly in winter. The incorporation of lime and air-entraining agents in a mortar mix combines the workability benefits of the lime with the freeze-thaw durability benefit of the air-entrainment.

If b made with dense sulfate ground conditions exist, the aggregate complying recommendations in 5. Unless the work is protected when not proceeding there is always the risk of sudden frosts or showers ba damage. If masonry units are too wet they can be difficult to lay and the finished work can develop efflorescence or leaching from the joints causing white stains.

Use mechanical handling equipment where practicable. Where practicable, suspended timber floors near to the ground should be supported independently of the main structure by sleeper walls. Hemp, fibreboard, cork and similar materials should not be used 562-83 expansion joints in clay brick masonry, but may be used for contraction joints in calcium silicate and concrete masonry.

BS permits variation in the dimensions of clay bricks. Chimney stacks built in cavity work may be provided with a DPC tray of a material stiff enough to form a cavity tray without being built into the inner leaf and so allowing structural continuity.


Code of practice for above ground drainage and sanitary appliances; — Part For example, movement joints at 12 m centres should be about 16 mm wide. This will give a regular appearance of verticality when viewed from positions other than very close to the wall.

Strong dense mortars such as Designations i and ii are not suitable for use with some other types of masonry units and selection is governed by other factors such as accommodation of movement, durability and strength.

Proportions should be consistent from batch to batch of mortar. Examples of such features are: Typical ways of connecting roofs with walls are shown in Figure 11, Figure 12 and Figure Lay DPCs in continuous lengths for the full width of the leaf, with mm minimum laps in runs and with full laps at angles. Where anticipated movements are different in magnitude and nature, parts of masonry of different material type should be effectively separated, e.

BS Part 3 Masonry – Free Download PDF

It is primarily intended for low 528-3 domestic buildings, but may also be considered suitable for other categories of buildings 6528-3 similar scale. Alternatively, a system of overlapping pre-formed trays can be installed to collect and discharge water from the cavity see Figure Sealant selection should be in accordance with the recommendations given in BS Proportioning by mass will produce more consistent mortars than proportioning by volume.

Table 1 — Materials for metal support and restraint components and recommended protection levels Durability category Base material Form A Hot-dip galvanized low carbon steel Sheet B Low carbon steel Strip C Low carbon steel Strip a Grade and standard that should be conformed to Protective measures to be carried out after fabrication All external cut edges to be protected using a one-pack chemical resistant paint conforming to HF1A to HF2F in part 4 of Table 4H of BS Specialist tie manufacturers should be consulted if mm long double triangle format ties are needed for 91 mm to mm cavities.

For dated references, subsequent amendments to, or revisions of, any of these publications do not apply.

Connections between the leaves of sound separating walls of cavity construction should be kept to the minimum number consistent with structural stability.

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