To properly seal the balcony: a guide

Water entering the building is anything but harmless: it causes profound damage that can lead to the complete destruction of the balcony, so that it can only be dismantled. In order not to let it get that far, a professional seal is recommended. In our guide you will learn how to properly seal your balcony.

Various variants of concrete waterproofing

The concrete slab can be sealed in different ways, for example by a combination of mortar coating, tissue embedding, sealing and painting (Dixboxid by Caparol). The traditional balcony restoration with bituminous membranes offers a reliable seal:

  • Production of a solid, stable substrate
  • Attach rain gutter including zinc sheet cover
  • Apply bituminous sealant with roller
  • Roll out the bitumen strips with heating and pull them up against the wall
  • Attach decorative plate to cover the wall connection
  • Close joints with weatherproof silicone

We would like to explain the third variant, the balcony sealing with 2-component sealing slurries in the context of a manual, so that you can seal your balcony yourself step by step.

Instructions for balcony sealing with 2-component sealing slurry

  • sealing tape
  • weatherproof silicone in cartridge
  • 2-component Dichtschlämme
  • silicone gun
  • Stirrer / drill with stirrer
  • flat brush
  • trowel
  • flat brush
  • sponge board

1. Prepare underground

First, create a strong, solid substrate that is free of voids, algae growth, dust and spalling. Also, the balcony floor should be absolutely dry before applying the sealing slurry.

2. Apply sealing slurry

The sealing slurry consists of two components which you must mix together. Follow the instructions and use your provided mixer. Observe the specified processing time: During this period, you should have used up your stirred material.

3. Apply sealant to edges

Apply the sealant first in the edge zones thick and wide with the flat brush.

4. Insert sealing tape

In the fresh mass press your sealing tape so that it runs along the edge zones towards the wall on the ground.

5. Coat the surface

Now apply the sealing sludge completely over the area with the surface brush. Make sure that there are no defects. After a suitable drying time, a second or perhaps even a third coating makes sense.

6. Tiled balcony

On the dried sealing surface, you can either directly glue the new tiles - or first apply a decoupling mat, which protects the flooring from tensions. The mat also serves to make the perhaps not quite even, sealed bottom more even.

Now your balcony is waterproof and well protected for many years. In the 4th part of our series you will learn how to insulate your balcony.

Tips & Tricks

In order to ensure that your balcony is effectively drained even after renovation, ask about the use of a drainage mat. This ensures that the rainwater drains reliably on tattered surfaces.

Video Board: MULTIPANEL INSTALLATION GUIDE - Waterproof Balcony Substrate System