Breathable, dehumidifying scratch coat, based on hydraulic lime

Code: INT.0201

Components: 1

Appearance: Powder

With the addition of mixing water only, this single-component premix creates a breathable, dehumidifying rough coating, preparatory to the application of restorative, dehumidifying, thermal-insulating and anti-condensation plasters, specifically INTOSANA, SANATIGH, SANAWARME and CALEOSANA, being plasters designed specifically for the healthiness of new buildings, existing buildings, works on green buildings and in the restoration of historic and monumental buildings.

Linee di appartenenza

Certification obtained and Standards

Specification for Mortar for Masonry - Mortars for renovations (R)

EN 998-1

Specification for Mortar for Masonry - Mortars for renovations (R)

Environmental claims content of recycled material

EN 14021:2016

Environmental claims content of recycled material

A + (very low emissions)


A + (very low emissions)

General characteristics


Pot-life: 60 min


Min. recommended thickness: 4 mm


Shelf-life: 12 months


Temperature of use: +5 / +30 °C




Maximum diameter of aggregate: 1.5 mm


Mix with water: 18 - 20 %

Technical specifications

Bonding force

> 1 N/mm²

Flexural strength

> 3 N/mm²

Total recycled content

2.6 %

Reaction to fire

A1 _

Static elastic modulus

10000 N/mm²


14 μ

Specific heat

1 kJ/kgK


1650 kg/m³

Capillary absorption

0.48 kg•h^0.5/m²

Compressive strength

> 10 N/mm²

Thermal conductivity

0.298 W/m*K

Available colours

- Light gray

Packaging and dimensions

- Bag 25 kg

- Pallet: 50 x (Bag 25 kg)


UNTERSANA is composed of hydraulic lime, botticino, kaolin, calcium caseinate, Vichy salt, tartaric acid and natural fibres. Does not contain cements, resins, solvents, thinners and radioemissive aggregates.


From 4 to 6 kg of UNTERSANA per square metre of surface to be rendered.

Use fields

Anchoring scratch coat (applied by "spraying" or "splashing") for the formation of an adhesive bridge for easy grip of subsequent plasters, dehumidifying, breathable, based on hydraulic lime.

Preparation of supports

Application surfaces should be clean, free of soiling, crumbling and non-adhering parts, dust, etc., conveniently saturated with water until they reach the condition "saturated with dry surface".

Use method

Pour about 2/3 of the mixing water into the mixer, add UNTERSANA and the remaining water; continue to mix until a homogeneous lump-free mixture is obtained. The mixing water should be about 22-25% of the weight of the bag. After mixing is completed wait a few minutes before applying.

"Spray" the product, with plastic fluid consistency, on the application supports, with plastering trowel and brick trowel or with plastering pump. Protect fresh surfaces from direct exposure to sunlight, from the rain and wind, cure the prolonged moist hardening.

Application methods

- Brick trowel

- Finishing trowel

- Plastering machine

Tool cleaning

- Water

Permitted supports

- Bricks

- Brickworks

- Mixed walls (bricks and stones)

- Stone walls

Warnings, precautions and Ecology

For a proper adhesion of the next plaster, it is appropriate to apply the latter before the complete curing of the rendering UNTERSANA (within 24-36 hours).

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