KS 20 Polystyrene Adhesive

SUBSTRATE PREPARATION:

The substrate intended for installing polystyrene 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 adhesive KS 20, KU 21 (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 installation of polystyrene 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. New cement-lime renders and concrete must be cured and seasoned. All substrates must be stabilized regarding the moisture level and the hardening process must be completed. When applying polystyrene sheets on substrates with poor load-bearing capacity, it is necessary to carry out adhesion test. Install a few sample polystyrene blocks of 10x10 cm dimensions and remove them manually after 4-7 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 polystyrene installation.

ADHESIVE PREPARATION:

Fill a clean container with 5.5–6.0 litres of cool water and put the whole adhesive content i.e. 25kg (0.22- 0.24 litres of water per 1 kg of powder) mixing it continuously. Use a slow-speed drill till obtaining a uniform consistency. Mix it again after 5 minutes. Do not add any other substances except water. The adhesive must be used within 1 hour after mixing with water. In case of curing, it’s necessary to mix it again without adding any water or fresh adhesive. Adding too much water impairs the adhesion features: to the substrate, peeling resistance, curing time.

POLYSTYRENE PANELS INSTALLATION:

Polystyrene for performing thermal insulation via BSO method should comply with PN-EN13163:2004 standard. When applying on walls, put the adhesive alongside the edges of polystyrene panel - min. 3 cm wide and 12 cm thick, 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. They cannot not be pressed twice or repositioned. Gaps exceeding 2 mm must be filled with polystyrene stripes. Minimum 24 hours after installation, the surface must be grinded with sandpaper and protected by installing additional anchors in accordance with the technical design or ITB Manual no. 447/2009. It’s recommended to use 4 anchors every 1/m², whereas near edge areas and plinths 6-8 anchors every 1/m². 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. To make a coating with fibreglass reinforced mesh use Adhesive KU 11 or KU 21. 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.