The necessary steps regarding the start-up of the external thermal insulation system are numerous and must be taken into consideration by the owners, engineers and applicators. One of the main ones is the substrate condition. The substrate should be checked for suitability and flatness for the application of materials in either new or older constructions.
If there are cracks in the concrete, they should be repaired immediately with cementitious repair mortar. Only then, our substrate will be ready and stable so that it is characterized by excellent adhesion and high elasticity.
The substrate must be dry and clean but also free of loose spots. In case of older constructions in which there are fragile parts, we must proceed with their dismantling and removal which will be restored with cementitious repair mortar. Also in the existing constructions we must take care to transfer the electrical and plumbing works to the level of the new final surface that will be created after the installation of the system.
Crack drilling & cleaning
Check the crack and drill deeply until a solid substrate is found. Remove loose parts and dust. If during the opening of the crack or the cleaning of the loose parts, find metal reinforcement, we proceed to the careful cleaning of it from rust and other loose and harmful particles with the use of wire brush and the subsequent application of the applied, anti-corrosion primer M STEEL by MARMOLINE. It is used as a bonding layer between the old and the new mortar layer, which will follow.
Application of repair mortar.
Then, after the application and relative drying of the anti-corrosion primer and while it is still fresh, we apply the thixotropic concrete structural repair mortar, THIXOCRETE R4 of MARMOLINE, taking care to thoroughly lay and cover all the gaps.
In a clean container, first add the minimum amount of water and mixing at low speed, gradually add the mortar until a homogeneous and lump-free mixture is achieved. Let it rest for 2-3 minutes and stir again. The application of the mortar is done with a trowel or by spraying with a suitable mortar machine.
Surface finishing can begin when the mortar has begun to set.
Regarding the rendering and the restoration of the damaged parts of our masonry, we must proceed with the application of the first coat plaster of MARMOLINE SV 1 in thickness up to 4mm which will be covered with repair plaster.
Ideal with the use of the one-layer repair plaster MARMOLINE SV 103 or with the application of the one layer fast-setting repair plaster MARMOLINE SV 101 in thickness up to 2cm with reinforcement mesh.