Immediately following the period of preliminary lèn lu, must proceed immediately to the work of checking the horizontal gradient, altitude, the flat and discovered the location of being convex concave, layered to make timely repairs, Accessories:-If you see unusual phenomena or cracking, chased, cornered or discrete buckets not tight ... must stop lu, find the cause and treat radically's lu continued. All this work must be completed prior to achieve 80% of the lu.-If having to compensate the already finished lèn Horde side, the surface layer of the nail CPĐD it must be ploughed with a minimum depth of 5 cm before laying.
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