Paving in double-layer compressed vibrated concrete slabs CE marked, produced and controlled according to EN 1338, type DOUBLE T, with circumscribed rectangular plan of dimensions 16.5 x 19.8 cm, thickness 6 cm, BASIC LINE SERIES finish (double base layer). The special double layer finish is made from selected silica sand aggregates with a maximum grain size of 2 mm. The slabs must be accompanied by a Product Certification issued by ICMQ (Institute of Certification) as a third party guaranteeing the final product.