One of our unique products is RINZAFFO MGN, a plaster developed in 1980 in Venice to the problem of capillary rising damp, penetrating damp and salts, however its origins stretch back to ancient Roman times.

It is a breathable salt resistant lime scratch coat, which protects subsequent plaster layers from the destructive effect of salts. Because it is both waterproof and breathable in the same time, it is suitable for a number of specialist applications such as:

  • base coat in any building subject to rising or penetrating damp
  • render against driving rain
  • A plaster against the damp patches, discoloration or the crystallization of salts (sulphates) around old fireplaces and chimney stacks, a frequent problem in old buildings
  • A lime-based "tanking slurry" to make basements or cellars waterproof
  • As a waterproof (but breathable) floor screed to prevent flooding in high water-table or pressure water situations

The RINZAFFO MGN system, due to its unique pore structure, prevents the crystallization of salts inside its pore structure. By regulating the evaporation of humidity it keeps salts residing inside the capillaries in a dissolved state thus prevents the rapid crystallization of salts often resulting in the detachment of plaster and deterioration of masonry.

With Rinzaffo MGN the surface of the plaster stays dry and healthy, and the appearance of the interior remains aesthetically pleasing.

The life expectancy of the plaster is very long even in "heavy-duty" damp and salty environments, if applied correctly, it can last over 40 years.


Performance Testing

The Rinzaffo MGN mortar has been subject to a series of very demanding tests, both in the lab and on real buildings such as being constantly submerged in the high tides of Venice.

Here is a short summary on some of the tests performed:

  • 00:36 Salts resistance test: resistant to all salts. 22 years of lab testing, nearly 40 years of field testing
  • 02:00 Water resistance test: it's waterproof
  • 02:47 Sideways pressure resistance

See the video below for more details on how good it really is.

Application of the Plaster

Here is tutorial about how to apply the Rinzaffo MGN plaster correctly, demonstrated by Mr. Naldo Busato - Venetian Building Restoration Master. 

Most important points are summarized below:

  • 00:15 Background of the plaster
  • 00:50 Mixing: don't add too much water, don't overwork it 
  • 01:43 Application
  • 02:10 Don't leave gaps in the plaster, cover the wall completely
  • 02:30 Near floor: reinforce the joints near the floor
  • 04:18 Add key to the plaster (brush it) to improve adhesion
  • 04:32 Cellars: can withstand sideways or hydrostatic pressure
  • 06:10 Dark areas or spots indicate insufficient thickness: apply additional material or a second coat (thicken the plaster) over darker areas after the first coat has dried
  • 06:46 Sockets, cut-outs: apply the plaster around all sockets to prevent water ingress (if it applies)
  • 08:00 Life expectancy of this lime plaster: 60-70 years

Technical Data

Here are some key technical data. Feel free to download the technical sheet for more information.

Granular size

0 - 5 mm



Vapour diffusion resistance (μ)


Thermal conductivity (λ)


Adhesion (N / m²)


Water intake (l / bag)


Weight (kg / m³)


Consumption (kg / m² area / cm thickness)


Bag weight (kg)

25         (48 bags per pallet)

Typical Applications

Rising damp, Penetrating damp, Wind driven rain, Basement tanking, Chimneys, Salts, Flooding


  • NHL 3.5 Natural hydraulic lime
  • Natural volcanic pozzolanic binders
  • Marble powder
  • Washed silica sand free of salts and impurities
  • Natural organic additives


Dark brown