Vetotherm Flex is a polymer-modified deformable cementitious adhesive specially designed for permanent fixing of thermal insulation boards to a wide range of substrates, including concrete and masonry. Vetotherm Flex is also designed for use as a protective mortar that provides a durable layer for insulation boards suitable for several decorative finishes.
All surfaces must be clean and free from oil, grease, or loose materials. The insulation board has to be fixed firmly by using Vetotherm adhesives and anchors.
Fill the large gaps between insulation boards with strips of insulation board to leave minimal gaps, or fill with PU foam of similar U-Value to the insulation boards.
Protect all the buildings by using PVC Vetotherm accessories unless otherwise is specified.
Apply Vetotherm Flex directly on concrete, cement plaster, and masonry. In the case of very porous substrates, spray water onto the surface prior to the application.
To ensure proper mixing, use a mechanically powered mixer or heavy-duty drill fitted with a suitable paddle.
Add 6.5-8 Liters (for each 25 kg bag) of clean water to a clean container. Add the powder slowly to the water while mixing continuously with a low-speed mixer/ heavy-duty drill (400 - 600 rpm) fitted with a suitable mixing paddle. Continue mixing for 3 minutes or until obtaining a uniform consistency.
Leave the mixture for 5 - 10 minutes to mature, then remix without adding additional water.
As an Adhesive
Apply the mortar in a strip around the insulation board with enough spots to ensure full coverage. In a smooth or plastered substrate, employ the back buttering technique. Use a notched trowel to spread the mortar on the back of the insulation board.
As a Base Coat and Protective Layer
Apply the mortar over the fixed thermal insulation panels. Using an aluminum roll, embed the precut reinforcing mesh onto the freshly applied mortar until fully immersed in the Vetotherm Flex layer.
Smoothen the surface with a long flat trowel. Apply more than one Vetotherm Flex layer where it is needed. Use a double or triple reinforcement mesh.
Note:
Clean all tools immediately after finishing with water. Clean hardened materials mechanically.