Substrate preparation: 

Apply to a sound and clean substrate (without cracks and delaminations), degreased, even and dry, and free of biological contamination or chemical efflorescence. The substrate should be free of algae/ fungi growth. In case of microbial contamination, the substrate should be cleaned with a power washer—subsequently, good quality antifungal solution for removing microbial contamination is to be applied as per the product manual. Any loose layers not bound to the substrate (such as loose render or flaked paint) should be removed. Wash and degrease old or dirty substrates with water and a cleaning agent. If there are any large irregularities to the substrate, these should be levelled out by using a levelling compound, e.g. Terrix RD-LB. Small irregularities can be levelled with levelling render, e.g. Terrix RN-LF 8. Before applying the levelling compound/render – refer to the product manuals and datasheets. Absorbent substrates should be primed before the levelling compound is used. 

Note: the finish coat may not be applied on newly completed mineral substrates (i.e. cement, concrete, and lime mortar renders) – min.: 2 weeks curing period is required. 

If the product is being used as a part of TERRIX®, render systems refer to the system manual for detailed application instructions. If any substrate unevenness exceeds 1 cm, use a levelling compound first.

Priming: 

For absorbent substrates, use Terrix® PR-UA as a primer before the product application.
Note: Before fixing EPS boards to uncertain substrates, it is necessary to perform an adhesion test. The test involves fixing a few (8-10) EPS samples of 10 x 10 cm dimensions in various places of the facade and then tearing them off after three days. The substrate load-bearing capacity is sufficient when the tearing happens in the EPS layer. If the whole sample, including the adhesive and substrate layer, is torn off, then it is necessary to remove the poorly bound layer from the substrate and prime it with Terrix®PR-UA. 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. 

Preparation: 

Pour the specified amount of clean water into a clean mixing vessel, and then add the appropriate amount of mixture. Mix until a smooth, lump-free consistency is achieved. Use a low-speed mixing device for the best results. You will need 25 kg of mixture for a maximum of 6.0 litres of water. Allow the mixture to rest for about 5 minutes before re-stirring before application. The workability duration is approximately 2 hours (at an ambient temperature of +20°C)

Application method (adhering insulation):

The notch trowel method can be used to adhere EPS boards to level substrates. Apply the mixed product to the slab with a trowel and spread it uniformly using its edge, creating a thin coat. Press the mortar onto the slab surface while spreading. Apply additional mortar with a notched trowel (minimum 10 x 10 mm notch size) and immediately position the slab on the wall, pressing it flush with adjacent boards. Use a staggered method to tightly fit boards together. Remove excess mortar from the joints, ensuring no residue on slab edges. Proper mortar application should cover the entire slab surface, with a maximum thickness of 1 cm after attachment. Allow 48 hours for curing before securing boards with suitable mechanical fixings.
To achieve a uniform surface, sand the entire EPS board with appropriate sandpaper.

Use the ribbon and dab method to apply cement mortar to the boards for uneven substrates. Apply a 30-60 mm wide ribbon around the slab’s perimeter and evenly distribute 6 to 8 adhesive dabs (approximately 100-120 mm diameter) on the remaining area. Form a prism-shaped ribbon with a trowel angled at 45° towards the slab surface. Position the slab on the wall immediately after applying mortar and press it flush with adjacent boards. Ensure boards are tightly fitted using the staggered method and remove excess mortar from the joints, leaving no residue on the slab edges. Proper mortar application should cover at least 40% of the slab surface, with a maximum adhesive layer thickness of 10 mm. After a minimum curing time of 48 hours, secure the boards with appropriate mechanical fixings (if required). Sand the entire EPS board surface with suitable sandpaper to achieve a uniform finish.
Base coat/ reinforcement layer:

First, install stress patches at the corners of openings (e.g., doors, windows, etc.) by applying diagonal straps of reinforcing mesh (with dimensions of 250 x 300 mm) at a 45° angle using Terrix® AD-BE mortar. The reinforcing coat (base coat + reinforcing mesh) must be applied to even, clean, and previously sanded surfaces of EPS boards no earlier than 3 days after board installation. Apply a continuous and even layer of the base coat mortar onto the substrate (with a thickness of approximately 3-4 mm) as wide as the reinforcing mesh. Spread the base coat mortar with a notched trowel and immediately embed the fibreglass reinforcing mesh into it. The reinforcing mesh should be evenly stretched and fully immersed in the base coat mortar. If needed, apply an additional thin layer of base coat to achieve a more even surface. Neighbouring mesh strips must overlap by no less than 100 mm. Sand down any trowel marks with sandpaper. The thickness of the reinforcing coat (base coat + one layer of reinforcing mesh) should be between 3-6 mm.

Drying: 

The adhesive takes at least 3 days to dry, but this can vary depending on the climatic conditions.

Useful hints:
The work should not be carried out at air and surface temperatures above +25°C, below +5°C, or during expected frosts. To prevent rapid drying, the freshly applied mixture should be protected from the sun, rain, and wind. It is prohibited to add any foreign substances to the mixture.