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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Alternatively, they should be suitably reinforced see Annex B and 5. Vertical DPCs at openings should be positioned to overlap any horizontal DPC at the sill of the opening and be overlapped by any cavity tray at the head see Figure They may be designed to drain the cavity but prevent the ingress of wind-driven rain.

528-3 the junction between a pitched roof and a cavity wall forms a sloping abutment, install a system of stepped cavity trays. BSSpecification for building limes. Three- or four-sided support should be assumed as appropriate. BSSpecification for reconstructed stone masonry units. As a rule, vertical joints to accommodate horizontal movement should be provided at intervals of between 7. Sliding anchor restraint fittings are available see Figure 17 for a typical example.

Clay bricks of durability Designation MN are not recommended in this situation. Specification for boards manufactured from expandable beads. The design should contain provisions for any chases cut in the wall sb 5.

BS 5628-3:2005

Cavities at the base of the wall should be kept clear. Double triangle ties of shape similar to those of BShaving a strength that conforms to Type 2 of DDare manufactured. Consideration should be given to non-combustible cover strips fixed to both faces of the wall on one side of the joint.

Low temperatures alone do not damage masonry, but if it is saturated, or near saturated, the water can freeze to form ice within the fabric. Some have, however, been ratified by CEN. Code of practice for masonry chimneys and flue pipes. Advice should be sought as to whether bricks laid frog down are acceptable.


Where Designation iv mortar is used it is essential to ensure that all masonry units, mortar and masonry under construction are fully protected from saturation and freezing see A. The cutting of holes up to approximately mm2 square i. BSLoading for buildings — Part 3: Specially pre-formed arch trays suitable for cavity walling are available from some manufacturers of DPC materials.

Normally in brick masonry, open cross joints perpend joints or, in block masonry, part open cross joints perpend joints serve as weepholes.

DPCs projecting into cavities provide a place for debris to lodge. The cavity tray should be supported by fine concrete fill in the base of the cavity, or by pre-formed in-fill units, in order to reduce stresses on the cavity tray and its joints.

Where the sill is in contact with the inner leaf, the DPC should be turned up at the back and ends for the full depth of the sill. Within each Designation, mixes produce mortars of approximately equal strength and durability.

Over-wetting of any bricks can cause efflorescence or lime staining.

If screws are used a minimum of four screws is necessary at least one of which is to be located within mm of the bottom end of the strap a Flat roof Each rafter anchored to wall plate with framing anchor, clip or nail Strap to have a straight length of at least 1 m and be either screwed to face of masonry, or have a tail built into a masonry bed joint. At least two weepholes above the tray at the front edge should be provided.

Special corner units are supplied by some manufacturers. Certain masonry external leaves require particular care in their construction compared with others, e.

Lapped at least mm Not under pressure mm passing lap met in normal construction and interlocking upstand Lapped at least mm Welded or welted Lapped at least mm Lapped at least mm and b Not under pressure met in normal construction Can stain masonry Not easy to work on site, so not suitable for cavity trays Avoid contact with aluminium The hessian or fibre Materials should be Likely to extrude unrolled with care.


Avoid intermix and contamination from other building materials, debris or other deleterious material. To match existing thicker walls, or for decorative purposes, bond patterns incorporating headers may be used for half brick leaves, but they will require the use of half-bricks, or bats, as the headers.

If cleaning becomes necessary take care not to damage the DPCs. Where the abutment is horizontal a cavity tray with stop ends and weepholes should be used. A microscopic labyrinth of voids exists at the interface because 6528-3 the physical nature of mortar bonding. NOTE For guidance on the use of flashings and weatherings, see 5.

Joists should not project into a cavity. Store metal and plastics components, e. Specification for laminated board for general purposes. The masonry should be designed not only 56288-3 resist the stresses due to the imposed load, but also the stresses which can arise from differential movement between the masonry and the frame.

BS Part 3 Masonry – Free Download PDF

Check the positions of the main features, such as quoins, door jambs, etc. Mixes of the same Designation have approximately equivalent strength and durability.

For this reason, the design should contain provisions for effective DPCs and the exclusion of water see 5. Sill materials should conform to the British Standards given in Table 4. Code of practice for concrete work. The calculations defining the mapped zones in [6] assume worst case conditions and so provide very conservative guidance.

BSSpecification for zinc alloy sheet and strip for building. A DPC should extend through the full thickness of the wall or leaf, and preferably project beyond the external face. Proprietary systems are available for this application.

Lap reinforcement a minimum of mm at joints in the length and fully lapped at angles.

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