Beyem Adheterm

Adhesive and basecoat mortar for EPS, XPS and MW thermal insulating panels in ETICS.

BEYEM ADHETERM is a polymer-modified, shrinkage compensated adhesive and basecoat mortar for EPS, XPS and MW thermal insulating panels in ETICS. Formulated with high strength cement, selected aggregates, special additives and synthetic resins  to improve workability, water retentivity, open time and adhesion. Fiber-reinforced.

  • Suitable for spray render and pump machines or manual applications.
  • Rainwater-proof and permeable to water vapour.
  • High deformability.
  • Excellent impact resistance.
  • High water retentivity.
  • Great workability.
  • High  bond strength on EPS, XPS, MW and substrate.

Bonding and levelling thermal insulation panels (expanded polystyrene –EPS-, extruded polystyrene –XPS- and mineral wood -MW -) in ETICS. Bedding coat for meshcloth insulation systems. 

BEYEM ADHETERM is suitable for:

Bonding thermal insulation panels:

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

Levelling thermal insulation panels:

  • Expanded polystyrene panel (EN 13163), extruded polystyrene   (EN 13164)  and  mineral wood  (EN 13162).

In cases not described, contact Technical Support.

Substrates must be clean, compact and  free of substances that reduce adhesion such as dust, oil, grease and with no loose material. Uneven areas must be corrected with suitable smoothing and finishing products. Substrates must be free from any rising damp and have already completed the curing period of hygrometric shrinkage. 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. Do not  use on  gypsum  based plasters or paints not well adhered to substrate.  

Mix manually of mechanically BEYEM ADHETERM with 4,75-5,75 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.

As adhesive: Apply BEYEM ADHETERM directly on the edges of the panel in perimeter strips (4-8 cm width and 2-4 cm thickness)  and several 8-10 cm Ø spots in the centre of the boards, depending of the size of the panel. The minimum bonded surface area must  be at least  60% for EPS/XPS and 80% for MW. Alternatively, use the notched trowel method for planimetrically correct substrates, spreading the product over the whole surface of the board.

As basecoat: At least 24 after installing the panels, fix corners profiles and reinforcement mesh in gaps. Insert fasteners and regularize any existing irregularities with the same BEYEM ADHETERM mortar. Treat conveniently the singular points. Spread a layer of mortar directly onto the insulation panel and then regularise the level with a notched trowel. Unfold the reinforcement mesh of 160 gr/ m2 from top to  bottom and press the mortar grooves until they are completely embedded in them. Joints of reinforcement mesh must be overlapped by at least 10 cm. This layer should be at least 2 mm thick and the squares of the embedded mesh should be visible through the surface. Once this layer has hardened, a second layer of BEYEM ADHETERM is applied (1-3 mm) to finish the covered surface.  The finishing coat can be applied at least 48 hours after last application of base coat. 

  • The boards should never overlay  the expansion joints of the building.
  • Do not apply on plastic, metal or wood.
  • Do not apply below 5ºC or above 30ºC.
  • Do not apply when there is  risk of frost, rain, strong wind or direct sunlight.
  • Do not apply to areas where there is a possibility of stagnant water.
  • It is mandatory to use ancillary elements: base profiles, corner profiles, etc.
  • The minimum number of fasteners per square metres is 6 for EPS/XPS/MW and 8 fasteners for building higher than 25m.
  • Reinforce the critical points of facade  before first layer of basecoat using reinforcement mesh of 160 gr/ m2 and fixing it with BEYEM ADHETERM.
  • Do not finish the insulation system with conventional renders.
  • Contact areas with  base/top profiles will be sealed with elastic joint sealant.

Product identity. Properties of mixture and application data





Bulk density

≈ 1285 Kg/m3

Density of the mix

≈ 1550 Kg/m3


0-600 µm

Mixing water,%

± 21%

Minimum thickness application as adhesive

≈ 2 cm

Maximum thickness application as adhesive

≈ 5 cm

Minimum thickness application as basecoat

≈ 3 mm

Maximum thickness application as basecoat

≈ 5 mm


≈ 1,5-2,0 Kg/m2  per mm  of thickness

Tariff code


Final performances



ETE 16/0129 ETAG 004

Bond strength onto concrete (initial and immersion)

≥ 0,8 MPa

Bond strength onto EPS insulation board

≥ internal cohesion of the board

Compressive strength

≥ 8,0 MPa

Flexural strength 

≥ 2,0 MPa

Thermal conductivity

0,47 W/m·K


BEYEM ADHETERM 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.

Conservación: 12 meses en envase original cerrado, a resguardo de la humedad y en lugares cubiertos. 

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

Bonding and leveling of EPS, XPS and MW panels for Beyem-Jafep External Thermal Insulation Composite System (ETICS), must be carried out with polymer-modified, shrinkage compensated adhesive and basecoat mortar compliant with ETAG 004 (ETE 16/0129), such as Beyem Adheterm manufactured by Rodacal Beyem company. Coverage will be ≈ 1,5-2,0 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

Declaration of benefits


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