As the facade in question is described in only a few words, we shall assume your facade is equipped with thermal insulation with a finishing system that was mostly used on such objects 10 – 15 years ago.

Years ago, the problems you are describing appeared due to an excessive absorption of humidity, which now results in the occurrence of mould. Mould or algae are mostly found in northern, shady sides of buildings. In order to remedy the problem on the surface, mould and algae must first be destroyed, after which the facade should be painted with a suitable paint.

If mould is the consequence of an inadequate finishing coat, remedial treatment should be have a long-term result, however, if the origin of the problem is in the structure, remedial treatment will only last temporarily.

Remedial treatment system:

1. The facade surface where mould is present must entirely be coated with SPEKTRA biocide agent SANITOL. The use of the biocide agent is not required on the sides and on the spots where there is no infestation. Coat the surfaces also approx. 1.5 m outside the visibly infested surface. The SANITOL agent is to be thinned with water in a ratio of 1:4 In the event of a severe infestation, thin it less or use the concentrated product. Once the surface is dry, remove the mould with a brush. Repeat the process in the event of severe infestation. The SANITOL agent does not visually change mould.

2. Once the facade surface has been treated for mould, impregnate with 1 coat of SPEKTRA acrylic impregnation that has been thinned with water in a 1:3 ratio (12 hours of drying).

3. Paint with SPEKTRA acrylic facade paint to which SPEKTRA protection against mould ZP has been added. It is required to apply at least 2 coats.

Warning:

SPEKTRA SANITOL is to be used independently and is active only during drying time. Do not mix the agent with paint as this has no effect.

SPEKTRA protection against mould ZP is a preventive agent which is to be mixed with the paint and is active up to 4 years, depending on the conditions on the facade surface. 1 liter of the agent is sufficient for 10 – 15 liters of paint. When using this agent, it is not required to thin the paint with water.

Read the instructions in the technical information before using the products.

Mould can occur as a result of moisture condensation on cold walls, which are the consequence of a poorly insulated building or structural mistakes, the so-called thermal bridges.

Suggested remedial treatment:

1. coat all infested surfaces with SPEKTRA biocide agent Sanitol,

2. impregnate the surfaces with SPEKTRA acrylic impregnation

3. treat the surfaces with SPEKTRA interior putty Termo in a thickness of 3–4 mm, sand them and apply 2 coats of SPEKTRA Termo Top interior wall paint.

Before starting work, we recommend reading the instructions on the use of the products, which are available also on our websites.

A good solution for your bathroom that would not involve a major intervention in your wall surfaces is hard to find, as the development of mould depends on the condensation of humidity in the wall surface. If you only planning to paint it, we recommend the following procedure:

Coat the mould with SPEKTRA biocide agent SANITOL. SANITOL destroys mould only as long as it is wet. Once dry, it no longer has an effect. The agent does not visually change mould, so the surface must be sanded once dry in order to remove the destroyed mould that is still visible on the surface.

When sanding, we recommend removing old lime paint thoroughly, as in most cases, it constitutes a separation layer between now coatings.

Once the surfaces are dusted off, impregnate them with SPEKTRA acrylic impregnation, thinned with water as indicated in the instructions on the packaging.

Paint the surfaces with one of SPEKTRA interior wall paints, to which you have added SPEKTRA protection against mould ZP.

If you want a long-term solution, you will first need to install thermal insulation on the object and a functional vent in the bathroom, and then follow the above described procedure.

Please also note the following: SPEKTRA biocide agent SANITOL is not to be added to the paint, but used independently.

More information on the products described is available on our websites and in the technical information.

Coat all infested spots and the area around using SPEKTRA biocide agent SANITOL. If infestation is strong, use the original solution, otherwise thin it according to the instructions on the packaging. Sanitol penetrates into the surface and destroys microorganisms both on the surface and on the inside. Once dry, remove the mould from the surface with a brush or sand it with sanding paper. If infestation is very strong, the procedure with Sanitol can be repeated. As Sanitol does not contain bleaching agents, it does not remove stains, meaning that painting will be required. To improve adhesion of the wall paint (several layers of old paintwork, poor quality of old paintwork), apply 1 coat of SPEKTRA acrylic impregnation onto a cleaned surface.

Then apply SPEKTRA Termo Top paint, which is distinguished by our newest technology. There are hollow glass beads in the paint, which act as an insulator on the wall together with the paint. The paint thus prevents the formation of condensation on the wall, which is the reason why mould occurs in the first place. We recommend painting the walls in two coats, using a white and colour shade according to the Terra colour card, which can be shaded in over 3000 shades at all sales points with the HGMIX mixing system.

Despite the procedures described above, rooms still need to be thoroughly ventilated, especially if they are humid.