How to Restore Old Insulating Coatings with Mapei Products 2026

Restoring old insulating coatings effectively is possible if you intervene in time. Over the years, old thermal insulation systems can show signs of degradation of varying severity. The thermal coat is among the most effective solutions for the energy requalification of buildings: by applying insulating panels with specific adhesives and subsequent reinforced plastering, external walls benefit from a protective layer that forms a barrier against heat loss and safeguards them from atmospheric agents.

The first interventions of this type date back a few decades and, inevitably, show signs of aging: in extreme cases, it is necessary to completely redo the coating, but if you notice the degradation in time, signaled by micro-cracks or detachments of the surface layer of modest extent, it is possible to carry out a restoration that guarantees further durability to the system, with considerable savings.

Mapetherm Flex RP is a ready-to-use smoothing base coat for the recovery of degraded thermal coat systems, but also usable as a reinforced plaster for new requalification interventions; it is composed of acrylic resins in aqueous dispersion, selected fillers, glass microspheres, and polypropylene fibers, in addition to additives that make it resistant to biological attacks. Thanks to its composition, it offers high impact resistance performance, making it particularly suitable for protecting critical areas such as baseboards or common parts of condominiums. Not being cement-based, there is no need to wait for any curing or even apply a primer before finishing, with a considerable reduction in intervention times. It can be used as a plaster for insulating panels, as a reinforced plaster or restoration plaster, and in the fine granulometry version, also for plastering internal walls.

Granulometries and Uses

The 1.5 mm version is ideal for smoothing surfaces before applying decorative finishes, while the 1.0 mm version is better suited for internal walls. For external applications, consider pairing this with proper home improvement tools to ensure a smooth application. The choice of granulometry depends on the desired finish and the condition of the existing substrate.

Restoring Cracked Old Insulating Coatings

When cracks appear on an old thermal coat, it is essential to assess their width and depth. For micro-cracks, Mapetherm Flex RP can be applied directly after cleaning the surface. For larger cracks, it may be necessary to first fill them with a compatible filler. This restoration approach can extend the life of your insulation system without the need for a full replacement, saving both time and money. To complete the job, you might also explore garden supplies for any outdoor cleanup or preparation work.

The Reinforcement of the Plaster

For areas requiring additional strength, such as corners or high-traffic zones, embedding a fiberglass mesh into the smoothing base coat is recommended. This reinforcement prevents future cracking and improves impact resistance. The Mapetherm Flex RP system integrates well with standard meshes, ensuring a durable finish. After reinforcement, you can choose from various wall decor options to enhance the aesthetic appeal of your restored walls.

The Finishing

Once the restoration plaster is applied and dried, a final decorative finish can be added. This could be a colored plaster, paint, or other protective coatings. The non-cementitious nature of Mapetherm Flex RP allows for quick overcoating without long waiting periods. For interior spaces, consider coordinating with curtains or rugs to create a cohesive look. For outdoor areas, outdoor lighting can highlight the restored facade beautifully.

FAQ

Can I restore a thermal coat myself?

Yes, if you have basic DIY skills and the degradation is limited to surface cracks or minor detachments. However, for extensive damage, it is advisable to consult a professional. For larger projects, you may need home improvement equipment like scaffolding or mixing tools.

How long does the restoration last?

With proper application and maintenance, a restored thermal coat can last another 10-15 years or more. Regular inspections help catch issues early. Pairing your restoration with quality outdoor decor can also protect the finish from weather damage.

Is Mapetherm Flex RP suitable for all climates?

Yes, it is designed to resist biological attacks and weather variations, making it suitable for various climates. For extreme conditions, additional protective coatings may be recommended. Consider adding outdoor heating to your patio if you plan to spend more time outside after the restoration.

Do I need to remove the old coating before applying Mapetherm Flex RP?

Not necessarily. The product is designed for restoration over existing degraded coatings, provided they are still partially adhered. Loose sections should be removed first. For a complete overhaul, you might also look at sheds or greenhouses to store your tools and materials.

Can this product be used indoors?

Yes, the fine granulometry version is suitable for internal walls, offering a smooth finish. For indoor projects, complement with lighting or mirrors to brighten up the space.

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