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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For detailed recommendations, designers are directed to BS Where the cavity is bridged, e.

BS 5628-3:2005

Keep cement stored on site to a practical minimum. The ba members of an overhanging cornice should be hollow bedded.

BSSpecification for dry packaged cementitious mixes — Part 2: Areas above doors and above or below windows may benefit from being reinforced to distribute tensile stresses see 5. NOTE For guidance on use see 5.

Specification for precast concrete masonry units. This column gives the tie lengths, in 25 mm increments, that best meet the performance recommendation that the embedment depth will not be less than 50 mm in both leaves after taking into account all building and materials tolerances but that the ties should also not protrude from the face.

In addition, follow these recommendations for flexible materials. 5268-3 the same time, fill any spaces left between the stones of the 568-3 wall faces with core stones carefully chosen to bond in with the remainder. Protect the stacks from rain and frost, and from soiling from the ground and passing traffic.

BS Part 3 Masonry – Free Download PDF

These restrictions avoid the risk of attack by run-off from limestone and concrete, respectively. Within each Designation, mixes produce mortars of approximately equal strength and durability. Double triangle ties of shape bz to those of BShaving a strength that conforms to Type 2 of DDare manufactured.

Low water absorption units such as engineering bricks should not be wetted as they can slide on the mortar. However, where lintels with flat soffits are used then the vertical DPC should be terminated at the underside of the cavity tray or turned back on to the inner leaf.


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. It may therefore be necessary to hold them in place by other means, such as a reinforced concrete, reinforced masonry or steelwork core. These thicknesses may be reduced to mm for walls built with cellular bricks. Where mixing by hand, mix the cement and lime, if used with sand before adding water until the colour is consistent.

Particular attention should be paid to long low horizontal panels of masonry, e. Specification for joist hangers for building into masonry walls of domestic dwellings. Styrene butadiene rubber SBR admixture may be used to make special mortars with high bond properties. Keep horizontal joints level and to a uniform thickness.

Sb lap is normally half the length of the brick, but quarter and third lap varieties are also used. When designing movement joints in separating walls, party walls or compartment walls, 56288-3 reduction in the efficiency of the wall as an insulator of sound, or as a fire barrier see 5. BSSpecification for polyurethane PUR foam systems suitable for stabilization and thermal insulation of cavity walls with masonry or concrete inner and outer leaves.

Sound insulating materials reflect most of the incident sound energy and so transmit little to an adjoining space, but gs do not usually reduce reverberation. These covers should be kept handy for use. Build in bonders, one to each superficial metre in each face in random work, and at approximately 1 m vertical and horizontal intervals bx coursed work, staggering the stones between the two faces.

Where necessary, copings should be suitably fixed down and can be doweled or joggle-jointed together. Examples of architectural features leading to increased local exposure are: In walls or leaves constructed of solid units, the depth of horizontal vs should be no greater than one-sixth of the thickness of the single-leaf at any point, and the depth of vertical chases should be no greater than one-third of the thickness of the single-leaf at any point.

BSTimber ba and workmanship in joinery — Part 3: Of the various mixes recommended for the mortars of each designation those incorporating lime in their composition show an improvement in bond development. The courses usually correspond with the quoin or jamb stones.


Arrange deliveries so that the materials do not arrive at site too early and that excessively large quantities are not delivered at one time.

Store metal and plastics components, e. Where a chimney stack is: Building details should accommodate any tendency for joints between the cladding and 528-3 underside of sills to close and between cladding and the heads to open as a result of differential movement between the structural frame and cladding see Figure Where quoin or reveal blocks are used, alternate short and long blocks should be used in successive courses to ensure that the bond within the wall is retained.

Where movement joints or edge clearances are required for walls designed to resist fire, they should be filled with a non-combustible material, such as bw fibre, which still allows the movement joint to function. Raking out joints gives a good key for the coating. Where joists are supported by a sound separating wall, they should be supported on joist hangers and not built into the wall. Extra care should be given to the choice of masonry units and mortar if the masonry is liable to be splashed with de-icing salts from roadways or if the building is to be located in conditions of extreme exposure to weather see 5.

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 ns, durability and strength. If screws are used, a minimum of four screws is necessary, at least one of which is to be located within 5682-3 of the botttom end of the strap b Pitched roof NOTE Vertical restraint straps as detailed in a or b should be provided at centres not exceeding 2 m, but each trussed rafter should be fixed to the wall plate.

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