Beyem Neocal Base

Breathable and rainwater-proof lime mortar suitable for spray machines.

BEYEM NEOCAL BASE is a breathable and rainwater-proof rendering lime mortar, suitable for both building rehabilitation and new construction. Formulated with mixed binders, lime, selected white aggregates, and special additives. Especially suitable for rehabilitation of historic and/or protected buildings (old masonry walls). Indoor environment quality. Classifed as A+ class according to Décret nº. 2011-321 (France). Free of radionuclides.

  • Suitable for spray render and pump machines or manual applications.
  • Mechanical strengths corresponding to lime mortars.
  • High water vapour permeability. Allows the wall to breathe.
  • Great plasticity.
  • Compatible with old masonry brickworks/walls.
  • Applicable  directly to the building enclosure.
  • Rainwater- proof. Weather resistant.
  • Suitable for internal or external walls.
  • New construction and building rehabilitation.
  • Very low VOCs  emissions.
  • Radiation-free certificate.
  • Mineral product. 

Thick bed rendering lime mortar for both building rehabilitation and new construction. Suitable to compensate uneven surfaces and flatness of the support. Ribbed metal wall panels especially designed for mortars. Especially suitable as a basecoat for BEYEM NEOCAL FINO finish. For grouting stonework. Suitable for walls and ceilings both in interior and exterior situations, manually or mechanically.

BEYEM NEOCAL BASE is  suitable for:

  • New construction and rehabilitation brickwork. Ceramic bricks.
  • Traditional plastering /rendering mortars.
  • Stonework. 

Substrates must be clean, compact and free of substances that reduce adhesion such as dust, oil, grease and with no loose material. Substrates must submit an adequate porosity and surface roughness. Uneven areas must be corrected. Dampen substrates with water to cool down if they should be too warm, in case of wind or over absorbent substrates and wait until the thin layer of water disappears. It is a good practice curing with a fine spray of clean water 24 h after application. Curing operation is essential to avoid  rapid drying and depends on the degree of porosity and surface absorption. If necessary, fill in the gaps of the substrate with BEYEM NEOCAL BASE and let harden.

Do not apply on gypsum-based plasters, paint, metal surfaces, plastic, surface waterproofing products  or materials with low mechanical properties. Consult our technical department to apply on cellular concrete.

Mix manually or mechanically BEYEM NEOCAL BASE with 4,5-5,0 l per bag of clean water until a homogeneous, creamy and lump-free paste is obtained. Let the mix stand for 5 minutes before application. To apply with render  spray machine, it´s necessary to set the relation water/mortar  and pump pressure depending on section and length of hose  and climatology conditions. It´s important to maintain the  variables affecting the properties of the applied mortar (distance to the wall, angle of application and water proportion).

Spread the mixed product with a trowel (in case of manually or mechanically application) leaving  10-15 mm of average  thickness depending on the desired finish. Thicknesses up to 30-40 mm can be applied in layers of 15 mm thick per day. Mark the pieces using PVC splines. Press to ensure adhesion and expel the air contained in the pores. Smooth with a ruler the applied material to regulate thickness. When BEYEM NEOCAL BASE is green (set but not fully hardened) it should be finished using the appropriate tool  depending on the desired texture (trowelled, scraping…). Time until finishing depends of substrate, temperature and humidity. 

  • Always mix with the specified amount of water.
  • Do not apply below 5ºC or above 30ºC.
  • Do not apply when there is risk of frost, rain, strong wind or direct sunlight.
  • It is not advisable to apply on horizontal or sloped surfaces in exterior situations.
  • Protect top edges of facade from rainwater penetration.
  • Above 15 mm of thickness, apply the product in two layers, leaving a roughness surface in the first to improve the adhesion of the second layer.
  • The minimum finishing thickness of render must be 10 mm, to contribute actively to the  waterproofing of surface.
  • Lime mortars have a slower setting, so the hardening time increases.
  • Expansion joints should be included as required by the substrate and respected by all applied materials.
  • Reinforcement with alkali resistant fiberglass mesh  may also be required, dependent upon substrate condition ( junctions of different surfaces, corners of voids…),  project specification or applied thickness greater than recommended.
  • As a basecoat mortar, is recommended to leave a rough finish.

Product identity. Properties of mixture and application data





Bulk density

≈ 1400 Kg/m3

Density of the mix

≈ 1750 Kg/m3


0-2 mm

Mixing water,% 

± 19 %

Minimum finishing thickness

10 mm

Maximum thickness  per layer

15 mm

Maximum thickness application

40 mm (three layers)


16 Kg/m2  per cm of thickness

Tariff code


Final performances





≥ 0,2 MPa

Compressive strength

≥ 1,5 MPa 

Water absorption

≤ 0,4 Kg/m2 min1/2

Water vapor permeability

µ ≤ 15

Thermal conductivity

0,75 W/m·k

Reaction to fire

Euroclass A1

Total VOCs (28 days)

< 500 µg/m3

Radioactivity index (U, Ra, Pb, Th, others)

I = 0,039

BEYEM NEOCAL BASE is packed 25 kg plastic lined paper bags.

Storage: when stored unopened in a cool dry place, shelf life is 12 months from date of manufacture.

Tools can be cleaned easily with water before the product hardens. Hardened product can be removed only mechanically.

Facade rehabilitation of historic and/or protected buildings and stonework grouting, must be carried out with COVs and radiation free, breathable and rainwater-proof rendering lime mortar compliant with EN 998-1- Class GP CSII Wc 1, such as BEYEM NEOCAL BASE manufactured by Rodacal Beyem Company. Coverage will be ≈ 1,6 kg/m2 per mm of thickness. The substrate must be clean, sound, compact and dimensionally stable. Expansion joints must be respected.

For further and complete information about the safe use of our product please refer to our latest version of the Safety Data Sheet, which is available upon request.

Disposal of the product and packaging must be in accordance with current legislation. This is responsibility of the final product user.


Hoja técnica

Ficha de Seguridad

Declaration of benefits

Factory Production Control Certificate

Declaración Compuestos Orgánicos Volátiles

Certificado Libre de Radiación

Certificado Sistema Gestión de Calidad ISO 9001

Certificado Sistema Gestión de la I+D+i UNE 166002

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