Exterior Applications: Used to bond EPS (Expanded Polystyrene) and XPS (Extruded Polystyrene) boards to wall surfaces such as exposed concrete, aerated concrete, brick, pumice, and plaster. It is used in insulation systems for bonding thermal insulation boards.
Interior Applications: Used to bond EPS and XPS boards to walls, ceilings, and floors. It is applied in wall partitions and suspended ceilings for thermal and sound insulation.
Other Applications:
• Used for bonding EPS/XPS boards in roof insulation applications.
• Used for bonding EPS and XPS boards in prefabricated structures.
• Used for bonding EPS and XPS boards in cold storage rooms and other industrial applications.

EPS thermal insulation board adhesive surface preparation before application is one of the most important factors affecting the effectiveness and durability of the adhesive. Applications made without proper surface preparation may weaken the adhesive’s bonding to the surface, causing the boards to shift or fall.
• Cleaning: The surface to be applied must be clean and free of dust. Dust, dirt, oil, paint, and other contaminants can prevent the material from properly adhering to the surface. The surface should be cleaned by sweeping, brushing, or vacuuming.
• Removal of Old Coatings and Weak Layers: If there are old waterproofing materials, paint, or other coatings on the surface, they must be completely removed. The presence of weak or loose layers can prevent effective adhesion of the material.
• Repair and Filling: If there are cracks, holes, or other irregularities on the surface, they should be corrected using an appropriate repair material or filler.
• Moisture Control: The moisture content of the surface should be checked. The moisture level should be below 5%. If the surface has a high moisture content, it should be allowed to dry before proceeding.
• Surface Water Absorption: If the application surface is concrete, it is essential to check the water content of the concrete. The concrete must be sufficiently dry; otherwise, the adhesion performance of the insulation board may be negatively affected.
• Primer Application (Optional): In some cases, applying a primer to the surface may be necessary. Primer helps the material adhere better, seals porous surfaces, and controls the surface’s water absorption capacity.
• Pre-Application Test: After surface preparation is completed, a small test application can be performed before applying the thermal insulation material. This test is conducted to check the adhesion ability and suitability of the material.

Adhesive Preparation:
Slowly pour 25 kg of PRATHERM®YPS250 powder mortar into 6.0 lt – 6.5 lt of water and mix using a low-speed mixer or drill until no lumps remain. Let the mixture rest for 5 minutes, then mix for another minute before application.
Application Method:
Spread the mortar on the surface and comb it with a notched trowel suitable for the size of the thermal insulation board. Press the boards firmly to ensure even leveling. Use a spirit level or straightedge to check the alignment. Once the adhesive has cured, fix the boards with mechanical dowels, applying 6 dowels per square meter. Ensure that the adhesive does not dry and form a film layer before bonding. Use the prepared mortar within 1 hour.

• Do not add any foreign materials (lime, cement, gypsum, etc.) to the prepared mortar.
• Expired mortar should not be mixed with water or dry mortar and reused.
• It is recommended to apply within a temperature range of +5°C to +35°C.
• Protect against rapid drying in windy weather.
• Do not apply on frozen surfaces.
• Do not apply under direct sunlight.
• Do not exceed the specified application area and usage instructions.
• Do not inhale directly. In case of eye contact, rinse eyes thoroughly with water and consult a doctor if necessary.
• Wait for the full curing process to be completed, as the adhesive may not reach its maximum durability before full curing.