Beyem Rock

Basecoat render and adhesive for fixing MW thermal insulating panels.

BEYEM ROCK is a basecoat render and adhesive for fixing insulating panels (mineral wool and glass fibre) in cavity walls. Formulated with high strength grey cement, selected aggregates, special additives to improve plasticity, adhesion, rainwater-proofing and an excellent workability.

  • Suitable for spray render and pump machines or manual applications.
  • Good mechanical strengths.
  • High  bond strength on MW panels.
  • Good open time. Allows adjustement.
  • Applicable  directly to the building enclosure.
  • High workability.
  • Rainwater-proof and permeable to water vapour.
  • Easy and  fast application.
  • Factory produced for consistency of proportioning.

Fixing  MW and glass fibre panels for thermo-acoustic insulation systems in cavity walls. Mineral render for facades, brickwork and  concrete block enclosures. Suitable as a grey coat finishing render or as a base coat for receiving mineral plasters, paints  and ready to use dispersion/silicate/silicon resin based renders.  As an undercoat in others multi-coat render systems.  Interior plastering. Suitable for  walls and ceilings  both in  interior and exterior situations, manually or mechanically.  Projectable. 

BEYEM ROCK is suitable for:

  • Bricks.
  • Concrete blocks.
  • Concrete  (treated with BEYEM UNIÓN MORTEROS adhesion promoter primer).
  • Cement based substrates.

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. 

Do not apply on cellular concrete, gypsum based plasters, paint, plastic, wood or materials with  low mechanical properties.

Mix manually of mechanically BEYEM ROCK  with 4,0-5,0 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).

As adhesive: Spread the mixed product with a trowel (in case of manually or mechanically application) leaving  aprox. 5mm of average  thickness. Smooth with a ruler the applied material. Set the insulating panel over fresh mortar and press to ensure adhesion.

As basecoat render: Spread the mixed product with a trowel (in case of manually or mechanically application) leaving  10 mm of average  thickness. Press to ensure adhesion and expel the air contained in the pores. Smooth with a ruler the applied material to regulate thickness. When BEYEM ROCK is green (set but not fully hardened) it should be  finished using a stainless steel trowel, wooden, plastic or sponge float according to the desired effect. 

  • 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.
  • Above 10 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.
  • Reinforcement with alkali resistant fiberglass mesh  may also be required, dependent upon substrate condition ( junctions of different surfaces, corners of voids…)  and project specification.
  • Expansion joints should be included as required by the substrate and respected by all applied materials.
  • It is necessary to use a primer on too high absorption substrates, as a cellular concrete, or on very low absorption substrates.

Product identity. Properties of mixture and application data





Bulk density

≈ 1400 Kg/m3

Density of the mix

≈ 1750 Kg/m3


0-1 mm

Mixing water,% 

± 18%

Minimum finishing thickness

10 mm

Maximum thickness application

20 mm  (two layers)


7,5 Kg/m2  per  ½ cm of thickness

Tariff code


Final performances





≥  0,2  MPa

Compressive strength

≥ 8,0 MPa

Capillary water absorption

< 0,2 kg/m2min1/2

Water vapour permeability

µ < 20

Thermal conductivity

0,67 W/m·K

Reaction to fire

Euroclass  A1

BEYEM ROCK 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 remove only mechanically.

Bonding of  MW and glass fibre insulating panels  must be carried out with rainwater-proof basecoat render and adhesive  compliant with EN 998-1- Class GP CSIV W2, such as Beyem Rock manufactured by Rodacal Beyem Company. Coverage will be ≈ 1,5 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.


Technical sheet

Component Safety Data Sheet

Certificado Sistema Gestión de Calidad ISO 9001

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

Descargar toda la documentación en ZIP

Declaration of benefits

Factory Production Control Certificate


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