Waterproofing TERRACES and BALCONIES - SCREED ELASTIC JOINTS

While making a screed on a terrace to be waterproofed using the "above screed" method, it should be taken into consideration that the screed must be built by creating section joints if the size of the terrace (rectangular or squared) is greater than 40~50 m2 or (independently of the measurement) when the terrace is a "L" or "U" shaped terrace.

These joints should not be made "by cutting the screed the day after" but interrupting the casting with a table while working on it.

These joints should be brought to the surface and the tiles or any resins should not be positioned astride the joint.

Therefore, we describe in more detail here below the right method for realizing this joint:

  • before installing the waterproofing layer, prime with one coat of NORPHEN FONDO IGRO the walls of the joint after widening it to 3~5 mm with a diamond disc and over the edges of the joint for at least 5 cm on each side;
  • alloe the solvent evaporation (15-30 minutes) and then seal the inside of the joint by creating a "bridge" astride the joint over approx. 5+5 cm on both sides with BETONSEAL MS 2.0;
  • after at least one hour and within 24 hours proceed with waterproofing using BETONGUAINA or any other product scheduled to be applied interrupting the reinforcement fabric over the joint so as to leave it free to move;
  • this joint must be raised and sealed with a low modulus sealant (NORDSIL 2.5) even after laying the tiles or the resin.

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