Weber Saint-Gobain - Official website of the company

webertherm base

webertherm base
webertherm base

Product benefits

  • Polymer modified for high bond strength.
  • Factory batched for consistency
  • Easy to spread

Cement based polymer modified base coat render for ETICS

webertherm base is a pre-bagged dry blend of cement, aggregates, polymer, and additives. It provides an excellent reinforcing coat for embedding glass fiber mesh in facade insulation system (ETICS). It is elastic, crack-proof and resistant to mechanical stress. webertherm base has an outstanding bonding effect and is water resistant.

Product Features


Appearance Powder
Composition Cement, siliceous sand and additives
Color Grey or White
Density 1.55 kg/lit. ± 0.05
Open Time 25 min. at 20°C
Pot Life 2 hrs at 20°C
Shelf Life 6 months
Mixing Ratio 5.5 to 6 lit. per 25 kg
Coverage 3 to 4 kg / m2 per coat
VOC and formaldehyde content ISO/FDIS 11890-2/GC-MS None (<10μg)

Tests and results

Tensile adhesion strength (N/MM2) ETAG 004:2000 (1)
28 days standard conditions
28 days standard conditions + 2 days water immersion + 2 hours drying
28 days standard conditions + 2 days water immersion + 7 days drying
Water vapor transmission acc. EN 15148:2000 [kg/m2.h½]

webertherm base / EPS






webertherm base can be stored for 6 months in dry conditions, away from extreme temperatures and protected against wind.


Printable TDS (PDF)

Printable MSDS (PDF)


Send or download the documentation

You can either send the documentation to an email address, or download it.

Instructions for use

Surface preparation

Surface must be clean and free from greasy matters or dust.

Product application

Use a stainless notched trowel to apply the mortar to the surface of the EPS insulation board to a uniform thickness of appr. 2 to 3 mm; immediately, lay in the meshcloth. Once the initial coat has started to ‘take-up’, apply a second layer of adhesive mortar to produce a sandwich approximately 6 mm thick totally encapsulating the meshcloth. The meshcloth must lie within the outer one-third of the webertherm base. At joints, individual meshes should overlap each other by 10 to 15 cm. At corners special reinforcing corner angle glass fiber mesh is used.
In order to protect against the formation of cracks, in areas where larger local stresses are to be expected, i.e. in the vicinity of the corners of door, window and other openings, strips of mesh (app.20 x 40 cm) should be placed diagonally across the corners.In case a thick mineral finish is required, lightly comb scratch the webertherm base to achieve a good mechanical key.

Clean up

Clean the tools with water after use. Cured materials can only be removed mechanically.

Environmental and Safety

Safety precautions

The product contains cement powders which, when mixed with water, release alkalis that could be harmful to the skin. It is preferable that the application be done in a ventilated area, and to wear protective gear for hands, eyes and respiratory system and to avoid breathing of the dust. Splashes on the skin should be washed away by cleaning with soap and water. In case of contact with eyes, wash thoroughly with clean water. If swallowed, do not induce vomiting; in both cases seek medical attention. The product is non-flammable.


While the company guarantees its products against defective materials, the use and application of these products are made without guarantee since the conditions of their application are beyond its control. It is recommended to verify with the company that the product is suitable for the intended use, and that this Data Sheet version is the latest one. The company may modify it without prior notice. Technical characteristics are listed for guidance only. For more information, please contact the company’s office in your location.


The information included on this Technical Data Sheet is the sole property of SODAMCO Holding. The unauthorized disclosure, use, dissemination or copying (either whole or partial) of this data sheet or any information it contains, is prohibited and subject to legal pursuit.

Available packaging

Lebanon25 kg
Syria25 kg
Jordan25 kg
KSA25 kg
UAE25 kg
Qatar25 kg
Kuwait25 kg
Oman25 kg