Is the wall blistering or flaking at the base? Rising damp brings salt into the wall — salt expands and breaks off the plaster. Zoccolatura’s pores absorb the salt and release moisture. It keeps the wall dry — WTA-certified salt resistance. This is Kerakoll Biocalce Zoccolatura.
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Salt efflorescence damages plaster: its pores absorb the salt — WTA 2-2-91/D certified salt resistance, ≥ 40% porosity
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Damp, saltpeter base: keeps the wall dry — μ ≤ 3 high evaporation, low capillary water absorption
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Mold, musty smell on old wall: natural bacteria and fungus repellent — pure lime, verified by CSTB method
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Monument, old plastered wall: compatible with original materials — natural lime, pozzolan, stone, marble, granite
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Exterior and interior base: resistant to salts, erosion, and detachment — R renovation/restoration mortar (EN 998-1)
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Pure NHL 3.5 lime, no cement: breathable and natural — low CO₂, very low VOC emissions
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By hand and machine: can be applied with plastering machine — WTA-certified mix, excellent cohesion
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Part of the system: built on Biocalce Rinzaffo base plaster — without it, salts can penetrate the fresh plaster
| Product family |
Biocalce moisture-removing system (Rinzaffo + Zoccolatura + Benesserebio) |
| Type |
Renovation/repair mortar, R (EN 998-1) |
| Salt resistance |
WTA 2-2-91/D — fulfilled |
| Water vapor diffusion (μ) |
≤ 3 — highly breathable |
| Material requirement |
≈ 12 kg/m²/cm |
| Minimum achievable layer thickness |
≈ 2 cm |
| Maximum layer thickness per coat |
≈ 2 cm |
| Packaging |
25 kg bag |
| Storage |
≈ 12 months |
What is it suitable for?
Masonry: Hollow and solid brick, tuff, stone, adobe, and mixed masonry. Damp and saltpeter-affected walls. Exterior base areas damaged by rising damp and salt concentration causing spotting, blistering, erosion, and detachment.
Usage: Regenerating and protective breathable plaster for exterior and interior. Moisture-removing plaster and base formation. Monument restoration for natural breathable regeneration.
Not suitable for:
- On contaminated, loose, dusty substrate
- On old paint or existing leveling
- On surfaces covered with salt deposits — remove them first
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Biocalce Rinzaffo without base plaster — base plaster is mandatory
- On horizontal surfaces exposed to stagnant water touching floors or sidewalks without separation
The Biocalce moisture-proofing system
Zoccolatura is the system’s salt-blocking layer. On salty, damp walls the full build-up is:
| Layer |
Product |
Function |
| 1st layer — base plaster |
Biocalce Rinzaffo |
breathable lime base plaster (adhesion enhancer), ≈ 15 kg/m²/cm |
| 2nd layer — salt-blocking plaster |
Biocalce Zoccolatura (this product) |
salt-blocking breathable plaster, min. 2 cm, ≈ 12 kg/m²/cm |
| 3rd layer — fine plaster |
Intonachino Fino, Granello; especially fine: Intonachino Tipo “00”
|
smooth, paintable surface |
| 4th layer — breathable paint |
Tinteggio, Silicato Puro Pittura, indoors Absolute Paint; on exterior facades Kerakover Silox Pittura
|
lime-based, breathable painted surface |
| 4th layer — finishing plaster |
Silicato Puro, Marmorino, Spatolato
|
decorative breathable surface |
Which layer is needed?
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Base plaster (adhesion enhancer): Biocalce Rinzaffo — μ ≤ 20
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Salt-damaged base, wall section: Biocalce Zoccolatura — this product, μ ≤ 3
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Energy saving, mold-free warm wall: Benesserebio — thermal insulation, λ 0.14 W/(mK)
Frequently asked questions
Why does the plaster bulge and crumble on the wall?
Because rising damp brings salt into the wall, and the salt crystallizes, expanding and breaking off the plaster. The salt-blocking breathable restoration plaster (e.g., Kerakoll Biocalce Zoccolatura) traps the salt in its pores and releases the moisture — this way the wall dries and the plaster remains intact.
What is efflorescence (saltpetering), and how can it be stopped?
Efflorescence is the white crust of salt that emerges from the wall, brought up by rising moisture. It can be stopped with a salt-resistant, breathable remediation plaster. This binds the salt in its pores and lets moisture escape — Zoccolatura is proven salt-resistant according to WTA 2-2-91/D.
Which remediation plaster is needed for damp, salty base walls?
One that is salt-resistant and highly breathable. Biocalce Zoccolatura with μ ≤ 3 vapor diffusion and ≥ 40% porosity keeps the wall dry, with WTA-certified salt resistance. Suitable for brick, tuff, stone, and adobe alike.
What does WTA certification mean?
WTA is the German technical standard system for remediation plasters (moisture-proof plasters). Testing according to WTA 2-2-91/D confirms salt resistance and high porosity — the benchmark for genuine remediation plaster.
Is a base plaster needed under Zoccolatura?
Yes. Always apply the Biocalce Rinzaffo base plaster — it increases adhesion, regulates water absorption, and prevents salts from entering the fresh plaster.
How thick should it be applied?
Apply at a minimum thickness of 2 cm, extending at least 50 cm above the clear moisture mark. Maximum 2 cm per layer — additional layers come after the lower one hardens.
Zoccolatura or Benesserebio — which one do I need?
Use Zoccolatura only for salt damage, and Benesserebio for energy purposes. Zoccolatura is a salt-blocking base plaster for purely salt-damaged wall sections. The Benesserebio is thermal: warmer, energy-saving — ideal where thermal bridges and mold are issues.
How many m² does a 25 kg bag cover?
Material requirement ≈ 12 kg/m² per centimeter. For the mandatory 2 cm layer, a 25 kg bag covers ≈ 1 m².
When should I NOT use it?
Do not apply on dirty, dusty, loose substrates, old paint, or leveling layers. Remove salt deposits first. Cellular concrete panels require special surface preparation — consult with us.
Can I apply it myself?
Can be applied by hand or machine. However, restoring salty, damp walls requires expertise — removing old plaster, assessing salt levels, and rebuilding the entire system. We also undertake complete installation.
