Waterproofing of dry wall humid areas

RELATED MATERIALS

ISOMAT SL 17 Elastomeric liquid membrane for waterproofing under tiles

AQUAMAT-ELASTIC Two-component, elastic waterproofing slurry

UNI-PRIMER Acrylic, water-based primer

POLYESTER CLOTH FOR WATERPROOFING LAYERS Polyester cloth for reinforcing waterproofing layers

FIBERGLASS MESH Fiberglass mesh for reinforcing waterproofing layers

SPECIAL PARTS MADE OF ELASTOPLASTIC ELASTOMER Elastoplastic elastomer parts for reinforcing waterproofing layers

ISOMAT AK-20 High performance, flexible, polymer-modified adhesive, C2 TE S1

ISOMAT AK-22 High performance, extra flexible, polymer-modified adhesive, C2 TE S1

MULTIFILL SMALTO 1-8 Water-repellent tile grout with porcelain effect

MULTIFILL-ELASTIC Colored elastic tile joint sealant

 

I. NATURE OF THE PROBLEM – REQUIREMENTS

Areas that are constantly subject to moisture, such as bathrooms, showers, sanitary areas etc. that have been built with dry wall materials (gypsum boards, chipboards etc.) must be waterproofed, since these materials are easily ruined by moisture in order to avoid water leakages (in the form of moisture) to neighboring areas.

Such waterproofing is normally applied underneath tiles that usually cover the surfaces of humid areas. The waterproofing layer must provide complete watertightness but also sufficient elasticity, since it is applied on substrates that are dimensionally unstable or suffer from vibrations. Furthermore, it must be resistant and durable because any future intervention to repair the waterproofing layer would be difficult and expensive.

II. SOLUTION

Usual sanitary rooms with average requirements
ISOMAT SL-17 is an ideal solution for waterproofing surfaces in humid areas that are subject to periodic moisture, such as bathrooms, showers etc. in houses or offices, whose walls are dimensionally unstable or suffer from vibrations (gypsum boards, chipboards etc.). It is a brushable elastomeric liquid membrane, ready-to-use, without solvents. After its application, it provides high elasticity, watertightness, and vapor permeability.

It is not suitable for areas with constant water presence.

Sanitary rooms with higher requirements
AQUAMAT-ELASTIC is an ideal solution for waterproofing surfaces in humid areas where moisture is constantly present. It is a 2-component elastic cement-based brushable sealing slurry, which provides complete watertightness and high elasticity. It is appropriate for gypsum board and chipboard surfaces, etc. AQUAMAT-ELASTIC is especially recommended for waterproofing surfaces of humid areas with higher requirements, such as bathrooms or showers etc. of industrial areas, swimming pools, meeting halls etc.


III. APPLICATION

Preparation of the substrate

  1. The substrate must be free of grease, loose particles, dust etc.
  2. When required, total smoothing of the substrate is carried out in order to create an even surface for the application of the waterproofing material and the subsequent tile fixing.
  3. The surface should be primed with the special acrylic primer UNI-PRIMER.
    Consumption of UNI-PRIMER: 100-200 g/m², depending on the substrate’s absorptivity.
  4. Depending on the conditions, the application of Isomat® SL 17 or AQUAMAT-ELASTIC follows.

Application of ISOMAT SL-17
ISOMAT SL-17 may be applied with a brush or roller in 2 layers, after the primer has dried. The first coat should dry completely before the second one is applied.

Alternatively, it may be applied in one stage by using a 3 to 4 mm notch trowel. In this case, the “combed” layer must be smoothed and leveled with a smooth trowel. This ensures uniform thickness of the layer.

Across construction joints and at the intersections between walls and floors, local reinforcing of the sealing membrane with a 10 cm wide fiberglass mesh tape or polyester cloth tape or special elastoplastic elastomer parts is recommended. In these areas, one layer of ISOMAT SL-17 12-15 cm wide is applied and the reinforcing material is put in place while the ISOMAT SL-17 layer is still fresh. Afterwards, 2 more local coatings follow. The second coat should be applied after the first one is dry.

Consumption of ISOMAT SL-17: 1-1.5 kg/m², depending on the absorptivity of the substrate.

Application of AQUAMAT-ELASTIC

  1. The content of the 25 kg bag (component A) of AQUAMAT-ELASTIC is added into the 10 kg of liquid (component B) under continuous stirring, until a uniform viscous mixture is formed, suitable for brush application. A low revolution mixer (300 rpm) may be used for mixing.
  2. AQUAMAT-ELASTIC is applied with a brush, in 2-3 coats. Each new coat should be applied after the previous one has dried completely. To avoid cracking, the thickness of each layer should not exceed 1 mm.
    Consumption of AQUAMAT-ELASTIC: 2-3 kg/m² in total.
    Across construction joints and at the intersections between walls and floors or wall-to-wall, local reinforcement of the sealing membrane with a 10 cm wide fiberglass mesh tape or polyester cloth tape is recommended. In these areas, a coat of AQUAMAT-ELASTIC 12-15 cm wide is applied, and the reinforcing material is put in place while the AQUAMAT-ELASTIC layer is still fresh. Afterwards, two more local coatings follow. The second coat should be applied after the first is dry.

Fixing of ceramic tiles
After 1-2 days, the tiles are fixed with ISOMAT AK-22. ISOMAT AK-22 is gradually added to water under continuous stirring, until a uniform paste is formed. A low speed mixer is recommended for mixing. The mixture should be left for about 5 minutes to settle, before it is slightly stirred again. The tile adhesive should be spread (“combed”) on the substrate with a notched trowel, in order to be uniformly applied on the whole surface. Tiles should be fixed by being pressed to the desired position. The applied mixture must be covered with tiles within 30 minutes in order to avoid film formation, i.e. before the adhesive film starts to set. ISOMAT AK -22 consumption: 1.5-4.0 kg/m², depending on the trowel notch size and the nature of the substrate.

Alternatively, the high performance, flexible, polymer-modified adhesive ISOMAT AK-20 can be used for fixing the tiles.

Tile grouting
After the substrate becomes walkable, the tiles are grouted with MULTIFILL SMALTO 1-8. The substrate covered with tiles should be perfectly clean. The joints should be carefully cleaned and dampened with a wet sponge. MULTIFILL SMALTO 1-8 is added to water under continuous stirring, until a uniform paste is formed. A low revolution mixer is recommended for the mixing. The mixture should be left about 3 minutes to settle and then slightly stirred again. Spread the grout on to the joints, using a rubber float in a diagonal direction to the joints, in order to fill them completely. The excess material should be wiped after a while, using a wet sponge. Finally, the surface may be cleaned with a dry cloth. Outdoors or at high temperatures repeated dampening is recommended after a few hours and when the grout has dried. The consumption of MULTIFILL SMALTO 1-8 depends on the tile dimensions and the joint width, which shall be 1-8mm.

Tile joints, where high elasticity is required (expansion joints etc.) should be pointed with the elastic tile joint sealant MULTIFILL-ELASTIC.

IV. REMARKS

  • Temperature during application must be at least +5oC.
  • Consult the usage risks and safety advice written on the bag.
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