KW 12 Adhesive for wool is a dry mixture of selected aggregates, cement and special additives improving the efficiency, adhesion and processing. KW 12 Adhesive is intended for installing mineral wool panels on mineral substrates: cement, cement-lime, lime, silicate, concrete, as well as making a protective coating strengthened with fibreglass mesh in thermal insulation systems performed via BSO method (light-wet). It can also be used to fill in any irregularities and cracks on stabilized substrates. It is intended for both exterior and interior application.
Appropriate water amount: approx. 5.0 - 6.0 litres/25kg Application temperature: between +5ºC and +25ºC Open working time (from application to panel installation): to 20 minutes Adhesive workability (after mixing with water): approx. 1 hour Curing time: to 24 hours Average consumption per 1 m2 for edge and pointwise application: between 4.5 and 5.5 kg Average consumption per 1 m2 for the whole surface application: between 5 and 7 kg Adhesion to concrete: ≥ 0,3 MPa Adhesion to polystyrene: ≥ 0,1 MPa Expiry date: 12 months Container: 25kg bag
The substrate intended for installing mineral wool panels must be even, dry, solid, as well as dust, contamination, bacteria (fungi, mould, mosses) and other chemicals free, etc. All contamination must be washed under high water pressure. Old render and paint coatings of poor adhesion must be removed. Fill in any cracks with adhesives KS 10, KS 20, KU 11, KU 21 or KW 12 (max. up to 6.0 mm on one coating) or standard render mortar. It’s recommended to apply GA 10 Acrylic Primer, 24 hours before the mineral wool installation on substrates with poor load-bearing capacity, very absorptive and chalky (i.e. leaving dust traces after palm rubbing) in order to strengthen them and reduce the absorption. Mineral wool can be installed on fresh cement, cement-lime renders after min. 14 days, while on concrete after min. 30 days. All substrates must be stabilized regarding the moisture level and the hardening process must be completed. In the event of applying mineral wool panels on substrates with poor load-bearing capacity, it is necessary to carry out adhesion test. Install sample polystyrene blocks of 10x10 cm dimensions and remove them manually after 4 days. The substrate is appropriate if the polystyrene is torn inside. If, however, the adhesive coating is removed with the polystyrene block and the substrate coating, it’s necessary to remove the poor coating and apply GA 10 Acrylic Primer - 24 hours before the panel installation.
Reinforcing layer: The surface of the mineral wool panel must be clean and solid. Any gaps between the panels must be filled in with mineral wool strips. Use additional fixing anchors in accordance with the technical design or ITB Manual no. 447/2009.
Fill a clean container with 5.5–6.0 litres of cool water and put the whole adhesive content i.e. 25kg (0.20 - 0.23 litres of water per 1 kg of powder). Use a slow-speed drill till obtaining a uniform consistency. Mix it again after 5 minutes. Then do it again and adjust the consistency by adding a small amount of water. Do not add any other substances except water. Working time after mixing with water is up to 1 hour. In case of curing, it’s necessary to remix it without adding any water or fresh adhesive. Adding too much water impairs the adhesion features: to the substrate, peeling resistance, curing time.
INSTALLING MINERAL WOOL PANELS:
Before installing the panels, cover their surface with a thin layer of the adhesive and then wait until it starts bonding. When applying on walls, put the adhesive alongside the edges of mineral wool panel - min. 3 cm wide and 1-2 cm thick, while pointwise while pointwise - 8-12 cm diameter adhesion layers - remember to place the same adhesive amount on the panel symmetrically. The total amount of applied adhesive should cover at least 40% of the panel’s surface, and 60 % after pressing it to the surface. In case of smooth substrates and ceilings, as well as plinths apply the adhesive on the whole panel surface with a comb trowel (at least 10x10 mm). After the application, the panel must be immediately applied to the wall in the appropriate area and pressed so as to obtain a flat surface with the neighbouring panels. The panels must be installed alternately and tightly jointed to the previously installed ones. After installation, the panels' position can be changed within 10 minutes time. Gaps exceeding 2 mm must be filled with mineral wool stripes. Minimum 24 hours after installation, it is necessary to install additional anchors with metal spindles in accordance with the technical design or ITB Manual no. 447/2009. Generally it is recommended to use 68 anchors per each square meter. The depth of anchors should be at least 6 cm in case of solid substrates, and 8 cm on light substrates. In case of masonry units the anchor must go at least through two walls of the unit.
REINFORCING LAYER PERFORMANCE:
The reinforcing layer can be made min. 3 days after the installation of mineral wool panels. Before installing the panels, cover their surface with a thin layer of the adhesive and then wait until it starts bonding. Before the adhesive application on the whole surface it’s necessary to install additional diagonal mesh piecies - 20x30cm - in the corners. Mesh stripes must be also installed in interior corners of window frames. Apply the adhesive with a comb trowel on previously prepared and dust-free mineral wool panels and attach the fibreglass mesh to it. Attach the mesh making vertical stripes leaving 10 cm gaps, and then smooth it to cover it completely. The mesh must not adhere directly to the mineral wool and cannot be visible. If necessary, apply another coating of adhesive. Any surface irregularities can be smoothed with sandpaper after drying. The reinforcing layer must be at least 3 mm thick. In order to strengthen the outer corners and edges use corners with mesh. On the ground area you must install two layers of the reinforced mesh or fibreglass armour mesh. The render can be applied at least 3 days, but no later than 3 months, after the reinforcing layer was made. Before the render application it’s recommended to paint the surface with primer PA 10 , PT 20 or PN 30 (depending on the type of applied render).
Slow-speed drill, a trowel, steel comb trowels, container for the adhesive.
The areas where the product was used or elements covered with the product must be ventilated until the odour vanishes completely. Only then can they be used.