Risanamur B80 MGN

Main Lime Coat for Basements

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Risanamur B80 MGN - Description

RISANAMUR B80 MGN is part of a lime plastering system for damp walls and basements, and it’s composed of two products:

  1. RINZAFFO MGN: Roman lime base coat developed in the 1980s in Venice to the problem of rising damp, penetrating damp and salts. This is a breathable salt resistant lime base coat, which protects subsequent plaster coats from the destructive effect of liquid moisture and salts.
  2. RISANAMUR B80 MGN, a lime main coat, a mix of lime and volcanic pozzolans. Thanks to the added pozzolans this plaster coat becomes salt resistant (to sulphates, chlorides and nitrates), lasting significantly longer in a damp environment than normal plaster coats.

This plastering system provides a robust, long-term, heritage-friendly solution to:

  • High-intensity rising damp
  • Severe penetrating damp
  • Heavy salt crystallization problems

and as such, it can be used with excellent results

  • In any coastal or marine environment
  • For the restoration and renovation of historic buildings
  • For farm and barn conversions.

It is a highly breathable plastering system, allowing the excess humidity to evaporate, without allowing the water-soluble salts to reach the surface. The performance of the plastering system has been proven by over 40 years of experience and thousands of interventions on building sites throughout Venice.

There is another cocciopesto-based variation of this plastering system, using the COCCIOPESTO DEUMIDIFICANTE MGN lime plaster as the main plastering coat, with the same proven results.

Key Features

Here are some key features of this product.


Being a lime plaster, it's naturally vapour permeable or breathable.

Resistant to all salts

This lime plaster is resistant to all types of salts (chlorites, nitrates, sulphates) and acids.

Resistant to High Humidity

This lime plaster can tolerate high levels of msoiture and humidity.

No cement, no chemicals

This plaster does not contain chemicals or cement - it only contains natural materials.

Extremely long lasting

Due to its microporous structure it blocks the movement of salts, being impervious to salts crystallization, crumbling and breakdown.

Suitable for Listed buildings

This plaster is suitable for historic or listed buildings and heritage renovations.  

For Cellars, basements

Can resist high humidity, suitable for cellars, basements.


  • Natural air lime: highest purity lime containing min 90% CaO, classified as CL90S according to EN-459-1 standard
  • Natural pozzolans: volcanic sands and ashes of exclusively natural origin, certified according to EN 197-1 standard
  • Natural hydraulic lime NHL 3.5, certified according to EN-459-1 standard
  • Natural river sands: washed river sands, free of salts and impurities, certified according to EN 13139 standard
  • Marble powders, certified according to EN 12620 standard
  • Natural plasticisers: of food / plant origin to improve workability

Technical Data

Granulation (mm)
Vapour diffusion resistance (μ)
Declared thermal conductivity - λ (D)
Water absorption
Adhesion (N / mm²)
Compressive strength (N / mm²)
Bulk density (kg / m³)
Bag weight (kg)
Water intake (litre / bag)
Consumption (kg / m² / cm)
Application temperature (°C)
Fire rating
Chloride content (%)
Harmful substances
Light Brown
Recommended thickness (mm)


  • UNI EN 998-1:2016 – Certified General Purpose Plaster for Internal / External Use (GP)
  • CE Marking: this product complies with all relevant European Union regulations, meeting all performance requirements required by the CE marking.


This material can be used in the following applications or solutions:

Similar Products

Here are some other similar products of the same category (e.g. other main coats or finishes). Depending on your application, you could use these as alternative products. 

Product Combinations

Although all MGN plasters can be used on their own, in many applications they perform best when certain materials are applied together as a plastering system complementing and reinforcing each other.

Here are some other plasters which are recommended to be used with this one.

Any Questions? Need Technical Advice?

If you have any questions about a project, a problem, a solution, or any of our plasters - please get in touch.

We understand that each project is unique. Using the contact form below feel free to ask us any question. Give us as much detail as you can about your project so we can get back to you with more relevant answers. 


Here are some key technical points about how to apply this material correctly:


  • Clean the masonry: the plaster must be applied on a cleaned and uniformly wet substrate. All crumbling and loose parts must be removed by brushing so the masonry is free of dust, salts and oils. If possible, also wash the walls with a pressure washer; this will clean and wet the walls in one go. Close larger holes with lime mortar and pieces of bricks.
  • Mixing: mix the material with clean tap water only without adding anything else (no other material or additive), until a homogenous, creamy-consistency mix is obtained. 
  • Application: apply the plaster in 10 mm coats.
  • Additional coats can be applied in 10 mm increments. Use an embedded fibreglass mesh for extra reinforcement over the recommended thickness.
  • Finish options: main lime coats can be optionally left without finishing. To have a finished surface any MGN finish can be applied: Calcina Fine MGN (white lime finish), Intonachino Arenino MGN (coloured lime finish) or Marmorino MGN (Venetian Marmorino finish).
  • Painting: as this is a breathable lime plaster, wall surfaces should be painted with a breathable mineral paint. Wallpapers and modern emulsion petrol-based paints, with no or limited breathability, should be avoided.
  • Application conditions: ambient and wall temperatures must be between +5 to +30°C during application. Surfaces should be protected from rain and humidity until they have completely dried (approx. 3 – 10 days depending on weather conditions).
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