BS 5385-5:2009 pdf free download – Wall and floor tiling一 Part 5: Design and installation of terrazzo, natural stone and agglomerated stone tile and slab flooring一Code of practice.
1) thickness: ± 1.5 mm on free standing units and ± 3 mm on bedded units;
2) length and width: ± 1.5 mm up to 1.5 m and ± 3 mm above
1.5 m and up to 3m.
h) Flatness, twist, winding and bow. Units should have a deviation of less than 3 mm from a 1.5 m straight edge placed in any position on a nominally plane surface. For facing slabs the permitted bowing should be all one way on all units supplied for any separate area of cladding as agreed between the supplier and the purchaser.
i) Regularity of plan shape. Units should have a deviation of less than 1.5 mm from the intended true line of the unit in any direction.
The manufacturer’s advice should be obtained when close tolerances are required, as those which can be achieved depend on the shape of the unit, the position of any projections, stiffness of the mould, method of assembly and the number of castings from each mould. For irregular, curved or specially shaped units, dimensions and tolerances should be clearly defined at the design stage.
NOTE 2 Particular attention is drawn to the possible difficulties created by an accumulation of tolerances.
j) Freedom from defects. Units should have an even distribution of aggregates over the face with the profiles true and the face free from flaking and/or crazing.
k) Age at delivery. Units should not be delivered until a period of 28 days from the date of manufacture has elapsed.
I) Recommendations for handling and storage on site. The manufacturer’s advice for handling and storage should be followed, and as a minimum:
1) units should be stacked under cover on clean, level, dry stacking areas;
2) to avoid bowing and/or deflection under self-weight, units should be stacked vertically on edge and non-staining laths or battens should be placed between the units;
3) to avoid discoloration, units should not be prematurely delivered to site nor come into contact with rope, straw, hardwood or other material likely to cause staining, nor should they be exposed to direct sunlight;
4) units should be protected from physical damage both before and after fixing.
5.3 Natural stone for internal and external floorings
5.3.1 General
NOTE 1 85 EN 12440 provides the classification and the correct identification of stone types and origin; however, for the purposes of this standard, the simplified descriptions in Annex A can be considered.
At the planning stage all stone types should be considered individually for their merits in use as flooring.
NOTE 2 There are many different classification schemes for stone, which have prompted the industry to simplify descriptions. This has led to many problems when, for instance, a stone laid as a granite is actually found to be a different stone type altogether and does not perform as expected.
When using natural stone for flooring, consideration should be given to the level of traffic and the desired finished effect.