Waterproofing of open balconies and terraces

In this article, we will take a step-by-step look at the waterproofing of open balconies and small terraces. It would seem that what do these two structures have in common, except that they are both outdoors? But as practice shows, waterproofing of these two structures in 99% of cases is performed almost identically and takes place in several stages: surface cleaning, cutting and sealing of junctions, waterproofing work. The technology proposed by Monolit Build specialists includes the use of innovative high-quality waterproofing materials that will protect your balcony or terrace from water, and are resistant to the destructive influence of weather conditions, which contributes to a significant increase in the period of operation of these structures.

Surface cleaning

Before proceeding with waterproofing work, it is necessary to thoroughly clean the concrete base from dirt, dust, oils, fragile particles and other materials. The main goal of this stage is an absolutely clean and smooth concrete surface.

We recommend cleaning using the following methods:

  • dismantling of the old coating with jackhammers
  • polishing the surface with diamond cups, protrusions, irregularities, etc.
  • washing with high water pressure (from 250 atm).

 

The device of joints and seams

First of all, you should check your balcony or terrace for the presence of a slope from the wall of the house, which must be mandatory, since it prevents the accumulation of water on the surface of the balcony or terrace. The most optimal slope height is about 1.5 - 2%. If the slope is not detected, then it must be done by arranging an additional layer of concrete screed, calculating the permissible load and thickness.

After performing the screed with a slope, you can proceed to the device of the abutments. At this stage, the joints with the wall are cut off using a jackhammer. If there is already a facade covering on the wall, then you need to cut out its lower part. The abutment must be performed with the primary foundation both horizontally and vertically.

After that, the cut-up joints must be sealed with a high-strength non-shrinkable repair mixture with high adhesion Teknorep 300 or Teknorep 300 EX and using the same material to make a chip along the floor-wall joints. This will significantly reduce the pressure on the waterproofing coating at the joint.

Arrangement of trays, pipes, funnels and other passing elements

Trays often run along the surface of the terrace/ balcony, internal funnels for receiving water are mounted, etc. To do this, you need to make a galtel along the abutments with a non-shrinkable Teknorep 300 or Teknorep 300 EX material. After the mixture has completely dried (24 hours), you can start applying a waterproofing layer.

Waterproofing application

Since the waterproofing layer will be applied to the concrete screed, it must first be primed with an Izoplast E Nano Power acrylic primer. It is necessary to apply the mixture in 2 layers with a flow rate of 0.2 – 0.25 kg / m2. The waiting time between applying layers is 1 hour.

After the primer has completely dried, a two-component polymer-cement elastic waterproofing membrane Izoplast Hydrolastic is applied to the entire horizontal surface of the balcony or terrace. The prepared solution should be applied in 2-3 layers using a roller, brush, or maklovitsa. Each subsequent layer must be applied perpendicular to the previous one with a material consumption of 3.5 kg/m2 per layer thickness of 2 mm. The waterproofing layer must be protected from precipitation and direct sunlight for 24 hours. After 3 days, you can start laying the cladding materials.