KOMBI WM1 – Mineral adhesive for mineral wool

SUBSTRATE PREPARATION: Apply to a sound/stable and clean substrate, degreased, even and dry, and biological or chemical efflorescence free. In case of algae/fungi growth, the substrate should be cleaned mechanically and then wash with water and disinfect with ALGIZID. The substrate must be protected against capillary action, moisture intake and precipitation. Any loose layers not bound to the substrate (i.e. loose render or flaked coatings) should be removed. Old and/or dirty substrates should be washed off and degreased with water and CLEANFORCE cleaning agent. If any substrate unevenness exceeds 1 cm, use levelling compound. Absorbent substrates should be primed with BUDOGRUNT ZG before levelling compound or adhesive is being applied. Before fixing thermal insulation boards to uncertain substrates, it is necessary to perform an adhesion test. The test involves fixing a few (8-10) mineral wool samples of 10 x 10 cm dimensions in various places of the facade and then tearing them off after 3 days. The substrate load-bearing capacity is sufficient when the tearing happens in the thermal insulation. If the whole sample including adhesive and substrate layer is torn off, then it is necessary to remove the poorly bound layer from the substrate and prime it with BUDOGRUNT ZG. When the primer dries, the adhesion test must be performed again. If the test gives a negative result, it is necessary to consider additional mechanical fixing or special substrate preparation.
PRODUCT PREPARATION: Gradually pour the contents of the packaging into a container with a measured amount of clean water (approx. 6 liters) while continuously mixing the mass (with a low-speed mixer fitted with a basket stirrer) until homogeneous mixture is obtained. After waiting for 5 minutes and remixing, the adhesive is ready for use. After adding water, the adhesive must be used up within approx. 2 hours (20°C, 50% RH).
FIXING OF FACADE AND DUAL-DENSITY MINERAL WOOL BOARDS: The prepared adhesive to be spread in the places where the adhesive will be applied later on by means of the ribbon and dab method. The ribbon should be 3÷6 cm wide, and should be applied onto the perimeter of the slab. In addition, 6 to 8 dabs of adhesive (approx. 10÷12 cm diameter) should be evenly placed on the remaining part of the slab. The ribbons must be formed in a prism shape. To do so, spread it with a trowel set at an angle of 45° towards the slab surface. Once the adhesive is applied, the slab must be immediately put onto the wall in its appropriate place and pressed to flush it with the neighbouring boards. Boards must be tightly fitted next to each other using staggered method. Excess adhesive coming out from boards joints must be removed so that no adhesive is left on the slab edges. Properly applied adhesive must cover not less than 40% of the slab surface, and the adhesive layer thickness should not exceed 1 cm. After allowing sufficient time to cure (at least 48 hours), the boards should be fixed by means of applicable mechanical fixings pursuant to the thermal insulation project.
FIXING OF LAMELLA MINERAL WOOL BOARDS: Using a stainless steel trowel, the prepared adhesive should be spread from the side it is applied on. Then, thin adhesive should be applied on the surface prepared in such a way by means of even layer with the use of toothed trowel (with the tooth dimensions of 12 x 12 mm). Afterwards, the slab must be immediately put onto the wall in its appropriate place and pressed with the trowel. Properly applied adhesive should cover the whole slab surface, and its thickness after attaching the slab should not exceed 1 cm. Mineral wool to be stuck in layers from the bottom to the top assuring the alternate boards system. After allowing sufficient time for adhesive to set (at least 48 hours), the boards stuck should be fixed by means of applicable mechanical fixing pursuant to the thermal insulation project.
DRYING: It is assumed that the adhesive initial setting period is min. 3 days (+20°C, 65% RH). After the period of time, one can attempt to perform the fibreglass reinforcing coat. In order to level the possible unevenness, the surface of assembled boards may be ground with thick sand paper. Note: Low temperature and high relative humidity essentially prolong adhesive drying time. For the purposes of performing reinforcing it is necessary to apply KOMBI WM2 base coat.
USEFUL HINTS: Drying time may be longer due to low temperatures and high relative humidity. Application and drying of adhesive requires dry days and temperatures between 5-25°C. All tools to be cleaned with water after
finishing work. Avoid working on surfaces exposed to direct sunlight, in strong winds or at a high air humidity. To protect a still wet thermal insulation coat against inclement weather conditions, scaffolding should be covered with some protective netting.
Note: The product is alkaline, therefore, it is necessary to protect eyes and skin. Safety clothing (PPE) must be worn while carrying out any installation work. In case of contact with eyes, immediately rinse them thoroughly with plenty of water. If irritation develops, seek medical assistance.