Strip of packing to estate is destined to cells frigorifere and for coolness, in which the strisce of packing to estate (1), realized with material expanded plastics, they are placed in the joints of head of the elements precast concrete slabs of wall, cover and pavement that form the cell, and are cut to measure with a width (b) correspondent to the depth of the joint (T).Secondo found the strip of packing to estate (1) is determine the proportions wider of the cut in width to measure (b) correspondent to the depth (t) of the joint. At least a longitudinal edge (2) of the tape of packing to estate (1) is refolded of the width addition (B1) and the refolded longitudinal edge (2) is fixed to the remaining part of the tape of packing to estate (1). With this it is obtained that the part in sight and respective the surface on the cell turned towards the outside of the strip of packing to estate is lacking in pori and therefore introduces a smooth surface.