Fiberglass Reinforcing Mesh for ETICS: Why Is It Essential?

When installing an External Thermal Insulation Composite System (ETICS), the quality of the insulation board is important, but it is not enough on its own to guarantee long-term durability. A decisive role is played by the fiberglass reinforcing mesh, an essential component of the reinforced base coat that protects the insulation system from the mechanical and thermal stresses it will face for decades.

The mesh acts as the structural reinforcement of the surface layer, helping to maintain the integrity of the façade over time.

Technical Specifications

Roll length: 50 m (±1%)

Width: 100 cm (±1%)

Mesh size: 4.5 (±1) mm × 4.5 (±1) mm

Colour: White

Weight: 158 g/m² (±5%)

Organic content: 20 (±4)%

Tensile strength: 35 N/mm / 40 N/mm

Elongation: 4.5%

Reaction to fire: Class F

Certification: ETAG 004

Packaging

The rolls are individually wrapped with heat-shrink film

Storage

Store in dry conditions. Recommended storage temperature: from -10°C to +40°C.

Alkali-Resistant Fiberglass Mesh: Engineered for Long-Term Performance

The mortars used in ETICS systems have a highly alkaline composition, and standard fiberglass may gradually deteriorate, losing its mechanical properties over time.

For this reason, professional reinforcing meshes are manufactured using specially treated fiberglass yarns and protective coatings that ensure resistance to the alkalis present in base coats and renders.

This feature enables the mesh to maintain its reinforcing function throughout the life of the system, ensuring reliability and long-lasting performance.

How Reinforcing Mesh Protects Against Cracking

Building façades are continuously exposed to movement caused by temperature changes, structural settlement, wind loads, and the natural expansion and contraction of construction materials.

Without adequate reinforcement, these stresses tend to concentrate in specific areas, resulting in hairline cracks and micro-fissures.

The reinforcing mesh distributes stresses evenly across the entire base coat layer, helping to reduce cracking while preserving both the appearance and the thermal performance of the insulation system.

Reinforced Base Coat: The Core of Surface Protection

The mesh is embedded within the base coat layer, creating a highly durable reinforced render system.

This layer performs several important functions:

• Protects the insulation boards;

• Improves the mechanical strength of the façade;

• Absorbs and distributes surface stresses;

• Provides a stable substrate for decorative finishes;

• Increases the overall durability of the ETICS system.

A properly executed reinforced base coat is one of the key factors in the long-term success of an external insulation system.

ETAG 004 Certification: A Mark of Quality

In the ETICS industry, compliance with ETAG 004 requirements remains one of the most important technical benchmarks for assessing the performance of system components.

Testing requirements include verification of:

• Tensile strength;

• Dimensional stability;

• Behaviour after accelerated ageing;

• Resistance to alkaline environments;

• Long-term retention of performance.

Choosing a mesh that complies with these requirements means selecting a product that has undergone rigorous testing and has been specifically designed to perform reliably within an external insulation system.