BS 4729:2005 pdf download

BS 4729:2005 pdf download.Clay and calcium silicate bricks of special shapes and sizes ——Recommendations.
5 Designation
The bricks of special shapes listed in this standard should be designated in the following groups:-BD: Bonding bricks (see Table B.1);
—CP: Copings and cappings (see Table B.2);—BN: Bullnose bricks (see ‘Table B.3);
—AN: Angle and cant bricks (see Table B.4);—PL: Plinth bricks (see Table B.5);
—AR: Arch bricks (see Table B.6);—RD: Radial bricks (see ‘Table B.7);-SL: Brick slips (see Table B.8);
– SD: Soldier bricks (see Table B.9);—CB: Cuboid bricks (see Table B.10).
Annex A (normative)
Information to be considered when ordering bricks
When determining the specification of bricks, only the physical properties that will be of significance in the finished brickwork should be considered and specified. Specification of properties that arc not essential can restrict the choice of brick offered. Specifiers should pay particular attention to the clauses referred to in the normative references (Clause 2) in order to assess the significance of each property and the need to specify it.
The following information should be considered when ordering bricks:
a) product name or colour and texture (see 3.4);
b) type number and description, right or left hand (if relevant, see 3.5). e.g. BN.3 single bullnose stop, right hand:
c) faced surfaces (see 3.3);
d) durability requirements. Bricks of special shapes that are to be used in positions where they are liable to be saturated and subject to freeze/thaw cycling, e.g. in parapets, copings. cappings, and sills need to be suitably durable. Specifiers should consult with manufacturers or suppliers regarding the suitability of the bricks for use in such exposed positions.
In addition:
1) for freeze/thaw resistance of high density (HD) clay bricks, see 5.3.6 and B.3 of
115 EN 771.l:2003+Al:200.5. and Annex I) of this standard:
2) for freeze/thaw resistance of calcium silicate bricks, see 5.7 of BS EN 771.2:2003+Al:2005;
3) for guidance on the use of bricks and mortars in positions of varying degrees of exposure, see
Table 13 of 85 5628-3:2001;
e) requirements for structural use. See BS EN 771.1:2003+A1:2005, and BS 5628.1 and 2; f) where products are to be used other than in the orientation described in this standard, a drawing showing the proposed application should be included with the order to allow the implications for manufacture to be considered, e.g. the effect of perforation hiatteras if the brick is to be used in a situation where it is structurally loaded perpendicular to the line of the perforations;
g) any special requirement not covered by this standard. e.g. position of any perforations and holes (see 3.1). or acid-resistance:
h) quantity:
i) packaging requirements:
a schedule of deliveries to be agreed with the suppliers.
Annex B (normative)
Shapes and dimensions of bricks
The shapes and dimensions of bricks that have been traditionally used in the UK and have been described by the designations in Clause 5 are given in Tables 111. to Table B.1o.
In the case of high density (HD)clay or calcium silicate bricks of a shape other than a rectangular parallelepiped and which are to be described by the designations in Clause S for the purpose of declaring the configuration in accordance with BS EN 771.1:2003+A1:2005. the key dimensions are A. B and C. All other dimensions should not be regarded as critical for the designation.
These dimensions (A. B and C) should be measured following the principles of procedure b) in hIS EN 772.16:2000. i.e. a single measurement across the centre of the unit. The measuring device ahould have the meaaurement precision given in Table I of 115 EN 772-16:2000.
For those units where angles are indicated in BS 4729 those angles should be checked using a protractor with lockable jaws or similar. The accuracy of the device should be ±l and the maximum deviation of the mean value of a sample often from the values stated in BS 4729 should be 1°.
When ordering product, reference should he made to the manufacturer with regard to the correct orientation in which the product is to be used.