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Brand: Kerakoll 🇮🇹
Fine-grained breathable mortar - class M15
Is the old masonry cracking and moving in an earthquake-prone area? If you reinforce it with cement mortar, it traps moisture and cracks the old wall. The fine-grained NHL lime mortar embeds the reinforcing mesh. Lime-based, compatible with old brick walls — not rigid cement. This is Kerakoll Geocalce F Antisismico.
| Type | Fine-grained seismic geo-mortar (matrix) |
|---|---|
| Binder | NHL 3.5 pure natural hydraulic lime (EN 459-1) + geo-binder |
| Performance | M15 (EN 998-2) R1 PCC (EN 1504-3) > 15 MPa compressive strength A1 |
| Material requirement | ≈ 14 kg/m²/cm max. 15 mm per layer |
| Packaging | 25 kg bag |
| Storage | ≈ 12 months |
Masonry: Brick, stone, tuff, mixed masonry, and concrete structures — boundary walls and infills, indoors and outdoors. Structural reinforcement, earthquake-resistant repair and modification. Restoration of damaged masonry, replacement of missing wall sections.
Reinforcing meshes/fabrics (works with these): GeoSteel G600/G1200 galvanized steel fabric, GeoSteel Grid 200/400 basalt-rustproof mesh, Geo Grid 120 basalt fiber mesh, Rinforzo ARV 100 glass and aramid fiber mesh; Steel Dryfast stainless steel rod.
Not suitable for:
Geocalce F Antisismico is the base structure (matrix mortar) for the reinforcing mesh. The construction of diffuse or band reinforcement:
| Layer | Product | Role |
|---|---|---|
| 1. First matrix layer | Geocalce F Antisismico — this product | ≈ 3–5 mm, to accommodate the mesh |
| 2. Reinforcing mesh/fabric | GeoSteel / GeoSteel Grid / Geo Grid 120 / Rinforzo ARV 100 | reinforcement providing load-bearing capacity |
| 2b. Connectors (optional) | Steel Dryfast rod + FL Antisismico injection | structural connection |
| 3. Cover matrix layer | Geocalce F Antisismico | ≈ 2–5 mm, full coverage of the mesh |
| 4. Surface | breathable plaster + fine plaster, then vapor-permeable paint | smooth, protective surface — the wall remains vapor permeable |
Which Geocalce Antisismico do you need?
How can old masonry be reinforced against earthquakes while maintaining the wall's breathability?
Breathable lime with matrix mortar and reinforcing mesh. Geocalce F Antisismico is a fine NHL lime mortar into which you embed GeoSteel fabric or mesh — the wall becomes structurally stronger but remains breathable without cement.
What is matrix mortar (FRCM), and what is it for?
The matrix mortar is the layer that fixes the reinforcing mesh or fabric to the wall and fully covers it. In the FRCM (fiber-reinforced mineral matrix) system, Geocalce F provides the matrix, and the GeoSteel/Rinforzo mesh provides the load-bearing capacity.
Which mesh or fabric can it be used with?
With GeoSteel G600/G1200 steel fabric, GeoSteel Grid 200/400, Geo Grid 120, and Rinforzo ARV 100 mesh. Together with GeoSteel G600/G1200 and GeoSteel Grid / Rinforzo ARV 100, CE marked (ETA).
What do the M15 and R1 classes mean?
M15 is the EN 998-2 masonry mortar strength class (> 15 MPa compressive strength), and R1 is the EN 1504-3 concrete repair classification. Together: certified structural and repair performance, compatible with old masonry.
Geocalce F or G — which one do I need?
F is fine-grained (0–1.4 mm), for mesh embedding, thin diffuse or banded reinforcing coatings. Geocalce G is coarse (0–2.5 mm), for thicker structural layers, welded rebar mesh, and consolidation. Use F for mesh embedding, G for thick structural layers.
Can it be purchased separately?
Yes. If the reinforcement system is designed by a professional and you source the mesh, fabric, and connectors separately, Geocalce F can be purchased alone. For complete reinforcement, mesh/fabric and surface plaster are also required.
How much material is needed?
Material requirement ≈ 14 kg/m² per centimeter, maximum 15 mm per layer. The exact amount depends on the reinforcement system structure (base + top layer, mesh type).
When should I NOT use it?
Do not apply it over existing plaster, smoothing, dirty, dusty, or salty surfaces. Not as standalone reinforcement either — without reinforcing mesh/fabric and surface plaster, it is not a complete system. Do not work with it below +5 °C, above +35 °C, or on frozen surfaces.
Can I apply it myself?
The mortar can be applied by hand or machine. However, seismic reinforcement requires structural design and professional execution — sizing of the mesh, connectors, and layers. We also undertake complete installation.
✓ Reduced pollution
✓ Bacteriostatic
✓ Low VOC emissions
✓ CO2 emissions ≤ 250 g/kg
✓ Recycled regional mineral material ≥ 30%
Substrate preparation: The masonry should be clean, solid, free of debris, dust, and mold. Roughen concrete and masonry surfaces (grade 8), then wash with high-pressure water. Remove weak bedding mortar and fill missing wall sections with Geocalce F Antisismico rubble fill. Before application, moisten the wall until saturated but free of surface water.
Mixing (25 kg bag): ≈ 4.5 liters of clean water in a concrete mixer. Add the water first, then all the powder at once; mix for 4-5 minutes until a homogeneous, lump-free mass is achieved. Do not add cement or other binders.
Diffuse or strip reinforcement: First ≈ 3–5 mm layer of Geocalce F; embed GeoSteel Grid / Geo Grid 120 / Rinforzo ARV 100 mesh or GeoSteel G600/G1200 fabric fully into the fresh mass; if needed, use Steel Dryfast rods + FL Antisismico injection; then apply ≈ 2–5 mm cover layer to fully cover the mesh. Maximum 15 mm per layer.
Curing: Protect the hardened layer from strong sunlight and drafts. Full curing ≈ 28 days.
Temperature and protection: +5 °C – +35 °C. Outdoors, separate the plaster from horizontal surfaces and protect the system from weather with a vapor-permeable facade paint — do not seal with a vapor-tight coating.
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Why choose us?
Request a material + labor package offer! The professional application of Kerakoll products ensures optimal performance and long service life. Don’t take risks – proper execution is at least as important as quality raw materials!
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- Structural, breathable lime mortar: enhanced vapour permeability in Kerakoll reinforcement systems
- Low modulus of elasticity: moves together with the existing masonry
- Fine-grained matrix: complete embedding of mesh and fabric
- Certified strength: M15 (EN 998-2) + R1 (EN 1504-3)
- CE-marked in the GeoSteel and Rinforzo ARV 100 systems (ETA)
- For heritage restoration: taking the requirements of the Italian Superintendence for Cultural Heritage into account
- A1 fire-resistance class
- GreenBuilding Rating 5: verified environmental impact
In the increasingly important world of sustainable building materials and eco-friendly practices, Kerakoll is a pioneer in the industry.
Founded in 1968, the Italian company has become a global leader in the production of adhesives, sealants, and other building materials, while remaining committed to environmental protection.
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