BS 7533-9:2010 pdf download

BS 7533-9:2010 pdf download.Pavements constructed with clay, natural stone or concrete pavers -Part 9: Code of practice for the construction of rigid pavements of clay pavers.
6.2.3 Paver size suitability should be selected in accodance with Table A.1.
NOTE There ore four bask bond patterns shown in Figure A. I. Variatson and mixture of these patterns gives a great variety of choice, and the inclusion of borders and panels separating courses can lead to further enrichment of the surface, Net all paver shapes are suitable for aft the patterns illustrated.
6.2.4 Normally, patterns are based on whole payers, with cut payers only being used to fit into edges and the non-regular abutments of paving to walls, etc., therefore sections smaller than halt unit payers should be avoided. Cuts should be made using a diamond-tipped water cooled saw to ensure sharp square arrises on payers.
NOTE The use of half pavers allows many additional attractive bond patterns to be created in rigid laid paves’s.
6.2.5 WIthin the same area, payers should be laid either on edge or on bed face throughout. Payers laid in a trafficked area should be laid in a herringbone pattern (see Figure Aia)J to aid interlock.
NOTE For edging, payers may be laid on their edge, or on end (on their smallest face). This allows for a more substantial concrete haunching to be placed to restrain the edge of the paved area, unless an edge restraint is provided by some vertical element for example walling.
63 Specific types of laying pattern
6.3.1 Stretcher/running bond
The directional nature of a pattern should be related to the overall design concept.
NOTE Stretcher/running bond has a strong linear quality. Curves in the line of the paving can be accommodated without difficulty. Both curved and straight lines should be carefully set out and maintained using lines and squares, as appropriate, to achieve consistency, as haphazard deviation will mar the appearance of the paving.
Quarter.. half- and third-overlapping bonds may be adopted to accentuate the linear character of the pattern; however, with quarter-overlapping bonds, care should be taken if curves are part of the design as the bond is easily lost when easing the payers around the curve.
6.3.2 Stack bond
Stack bond has a strong linear character, in this case in two directions, and care should be taken in maintaining cons.stent straight lines. NOTE 1 The pattern of this bond cannot follow a curve,
The pattern also demands greater dimensional consistency than is provided by some clay payers and, if a precise effect is required, some sorting of the payers should be made.
NOTE 2 Clay payers of quite rustic character in such a pattern can look well laid.
Rustic payers have by their nature a wider variation in their plan size and designers should allow for a more varied joint width when such payers are installed.
6.3.3 Herringbone
NOTE 1 Herringbone is a good general purpose paving pattern without strong directional emphasis. However, br.ck-on-edge versions have slightly more directional quality than when payers are laid on their bed face. Many consider that herringbone bond rends to make the paved area appear larger The interrupted straight lines generated by the long edges of the payers can easily become misaligned.
The pattern should be set out at 450 to the principal direction of viewing in order to minimize the chances of misalignment becoming noticeable,
NOTE 2 The disadvantage in adopting this laying pattern is that additional cuts are needed for the inevitable triangular edge in fill pieces. Although the pattern cannot accommodate curves within it. it does relate well to curied or free form areas.
Not all paver shapes work well with rigid laid herringbone bond so a trial area should be laid out before a final choice of bond is made.
6.3.4 Basket weave
NOTE Although straight lines are present in basket weave, they do have a beiy static character, and this tends make the size of the paved area appear smaller.
As with the stack bonding, there should be some sorting of the payers when laying payers of less consistent shape and size.
6.4 Curved and circular patterns
NOTE 1 Success in laying rectangular pa vers to curved patterns depends on the tolerances of the mortar joint to ease the units around the redo By using cut payers, more joints are introduced and, therefore, more adjustment is possible. By splaying the cut units, tighter radii can be built.
When setting out curved and circular patterns skill and care should be employed.
NOTE 2 Suitable curved units are available as well as circular patterns and feature work details from some manufacturers.
6.5 Drainage
Drainage should be provided for all rigid laid paving (see 4.1).
6.6 Laying payers
If a DPM is required, it should be a liquid and applied by a brush or spray. The DPM should be applied to the structural base prior to the payers being laid. It should be applied to a clean, dust free surface in accordance with the manufacturer’s Instructions. If the top surface of the structural base is not tamped when laid, some coarse sand particles sprinkled over the wet membrane should be used to help adhesion between the membrane and bedding mortar. Any loose sand should be brushed from the surface before the bedding mortar is laid.