Is your old brick or stone wall cracked or weakened? Rigid cement mortar won’t fix it. It traps moisture and further stresses the wall. The solution is pure NHL 3.5 lime, M10 class. Strong and breathable. You can also create reinforced plaster strengthening with Rinforzo ARV 100 mesh. For strengthening damaged walls and vaults. This is Kerakoll Biocalce Muratura Fino.
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Weakened, damaged old wall: reinforced plaster strengthening — with Rinforzo ARV 100 mesh, in two ~10 mm layers
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Load-bearing masonry required: M10 class, 100 kg/cm² compressive strength — the strongest masonry mortar in the Biocalce line
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Cement traps moisture: breathable lime mortar — pure NHL 3.5 lime, high vapor permeability (μ ≥ 15 ≤ 35)
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Mixed old and new brick: long workable mortar — you have time to adjust the elements
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Monument, vault, old structure: traditional material — lime, marble, limestone, low chloride (≤ 0.004% Cl)
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Finer, smoother masonry: 0–1.5 mm grain — more precise bedding and plasterable reinforcing layer
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Exterior and interior: A1 fire resistance class, non-combustible mineral mass — suitable for both facade and interior
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Healthy, eco-friendly construction: antibacterial and antifungal, low VOC (EC1 plus) — GreenBuilding Rating 4
| Binder |
NHL 3.5 pure natural hydraulic lime |
| Strength class |
M10 (100 kg/cm²) |
| Grain size |
0 – 1.5 mm |
| Water vapor diffusion (μ) |
≥ 15 ≤ 35 |
| Reinforcement |
With Rinforzo ARV 100 mesh |
| Material requirement |
≈ 1.7 kg/dm³ |
| Packaging |
25 kg bag |
What is it suitable for?
Substrates / masonry units: Hollow and solid brick, tuff, natural stone, and mixed masonry — both load-bearing and infill masonry. Monument and historic building restoration.
Functions: Construction and restoration of breathable masonry; rubble infill; collaborative, reinforced plaster strengthening of damaged walls and masonry vaults with Rinforzo ARV 100 glass-aramid mesh; sandwich-type reinforced plasters.
Areas: Exterior and interior load-bearing and infill masonry — where greater strength, reinforcement, or a healthy, breathable structure is the goal (Edilizia del Benessere).
Not suitable:
- For contaminated, loose, dusty, interstitial salt-containing substrates — clean first
- For simple, general bedding where M5 is sufficient — the more economical Biocalce Muratura is the right choice
- For visible masonry grouting — for fine joints use Biocalce Pietra
The Biocalce masonry and restoration system
Biocalce Muratura Fino is the layer for wall construction and reinforcement. The full build-up of a breathable wall from structure to finished surface:
| Layer |
Product |
Role |
| 1. Masonry / reinforcement |
Biocalce Muratura Fino (this product) |
M10 lime bedding, wall construction and reinforced reinforcement |
| 2. Base coat |
Biocalce Rinzaffo |
adhesion promoter under the plaster |
| 3. Base plaster |
Biocalce Intonaco |
breathable plaster layer |
| 4. Fine plaster |
Intonachino Fino / Granello
|
smooth or grainy, paintable surface |
| 5. Surface |
breathable paint or noble plaster |
final, breathable, colored surface |
Reinforced plaster reinforcement (ARV 100 system):
- First layer ≈ 10 mm Biocalce Muratura Fino
- Freshly embedded Rinforzo ARV 100 alkali-resistant glass-aramid mesh
- Second layer ≈ 10 mm Biocalce Muratura Fino (total thickness ≈ 2 cm)
Which Biocalce masonry mortar do you need?
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General masonry, bedding, rubble filling (M5): Biocalce Muratura — coarse grain (0–2.5 mm), Rating 5
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Load-bearing masonry + structural reinforcement (M10): Biocalce Muratura Fino — stronger, also for reinforced plaster (ARV 100 mesh) — this product
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Grouting + visible masonry (M5): Biocalce Pietra — fine grain (0–1.4 mm), low water absorption
Frequently Asked Questions
How can you reinforce a cracked, weakened old wall?
Reinforced with reinforced plaster. You embed an alkali-resistant mesh into a ~10 mm mortar layer, then comes the second layer. Muratura Fino M10 lime mortar is for this — with ARV 100 mesh, it provides a breathable reinforcing layer.
What is reinforced plaster?
Reinforced plaster is a mortar layer strengthened with mesh that holds the weakened wall together. You embed the Rinforzo ARV 100 mesh fresh into the first ~10 mm layer. Then comes the second ~10 mm — total thickness ≈ 2 cm.
What does the M10 class mean?
M10 is the strength class — 100 kg/cm² compressive strength, the strongest in the line. It provides a solid base for load-bearing masonry and reinforcement. For general bedding, M5 Muratura is sufficient.
Muratura or Muratura Fino — which one do I need?
Muratura M5 is coarser (0–2.5 mm) — for general bedding and filling. Muratura Fino M10 is finer (0–1.5 mm), stronger. For load-bearing masonry and reinforced plaster strengthening, use Fino.
Does the wall remain breathable after reinforcement?
Yes. Pure NHL 3.5 lime, with high vapor permeability (μ ≥ 15 ≤ 35), without cement. The wall dries freely; the low chloride content (≤ 0.004% Cl) protects the old wall.
Is it good for monument and vault restoration?
Yes. It consists of traditional, natural ingredients — lime, Carrara marble, dolomite limestone. It can also be used for reinforced strengthening: for vaults and damaged masonry restoration.
How much material and water do I need?
From a 25 kg bag, you get about 14.7 liters of fresh mortar, with about 4.8 liters of mixing water. The amount depends on the joint and masonry unit. For reinforced plaster, the thickness is about 10 mm × 2 layers.
When should I NOT use it?
Do not use on contaminated, dusty, loose, or efflorescent substrates — clean them first. If M5 is sufficient (general bedding, filling), Muratura is more economical. For grouting, use Pietra.
Can I do it myself?
Plain masonry with a trowel works like traditional mortar. However, reinforced plastering is a structural intervention — it requires planning and expertise. We also carry out the complete system installation.
