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CRERESIT-CERETHERM

With our expert façade solutions, your property will boast a refined, modern exterior that enhances curb appeal and makes a lasting impression on visitors, clients, and passersby.

Ceresit Ceretherm External Wall Insulation System

The Ceresit Ceretherm External Wall Insulation (EWI) System, developed by Henkel Ireland Operations & Research Ltd, is a high-performance insulation and façade solution designed to improve the energy efficiency and weather resistance of buildings across Ireland. Certified under NSAI Agrément Certificate No. 09/0340, the system complies with all relevant sections of the Irish Building Regulations (1997–2019) and is widely used in both residential and commercial applications.

Use:

 

The Ceresit Ceretherm system is intended for:

  • External thermal insulation of masonry or concrete buildings (new or existing)

  • Low-rise and medium-rise buildings up to six storeys (18m)

  • Refurbishment projects where energy upgrades and façade renewal are required

  • Not approved for timber or steel frame structures

The system significantly reduces heat loss, improves energy ratings, and provides a decorative, durable finish suitable for Irish climatic conditions.

System Components:

 

Each Ceresit Ceretherm installation comprises a series of compatible layers forming a tested and certified system:

  • Adhesive: Ceresit CT 83 (cement-based) or CT 85 / CT 190 for mineral wool systems

  • Insulation Boards:

    • Expanded Polystyrene (EPS)

    • Graphite-enhanced EPS

    • Mineral Wool (lamella or slab)

    • Phenolic foam (where high insulation efficiency is required)

  • Mechanical Fixings: ETA-approved anchors with plastic or metal expansion pins

  • Base Coat: Cementitious or polymer-modified base (CT 85, CT 190) with embedded glass-fibre mesh (160 g/m²)

  • Primer: Ceresit CT 16 or CT 15 as a bonding bridge for render coats

  • Finish Coat: Wide range of textured renders — silicone, silicate, acrylic, or mineral

  • Ancillary Components: Profiles, beads, and fire barriers for edge, base, and junction detailing

Compliance:

The Ceresit Ceretherm system satisfies the following parts of the Irish Building Regulations (1997–2019):

  • Part D – Materials and Workmanship: Certified and quality controlled under NSAI Agrément

  • Part A – Structure: Adequate strength and resistance to wind loading

  • Part B – Fire Safety:

    • EPS: Class B-s2,d0

    • Mineral Wool: Class A2-s1,d0 (non-combustible)

  • Part C – Resistance to Moisture: Proven resistance to rain penetration and condensation

  • Part L – Conservation of Fuel and Energy: Achieves low U-values compliant with national energy standards

Fixings (Typical):

  • EPS systems: 6–8 fixings/m²
  • Mineral Wool systems: 8–12 fixings/m²
  • Above 2 storeys: Add stainless-steel fire fixings (1 per m² minimum)
    All fixings must be ETA-approved and installed to the manufacturer’s layout and pull-out requirements.

Installation

Installation is to be carried out only by Henkel-approved and NSAI-certified contractors trained in Ceresit Ceretherm application procedures.

Key installation requirements:

  • Substrate inspection, cleaning, and pull-out testing before installation

  • Wind-load and U-value calculation according to project specification

  • Correct placement of fire barriers and stainless-steel fixings

  • Application temperatures between +5°C and +25°C

  • Weather protection during curing (avoid frost, rain, or strong sunlight)

Henkel provides full technical support, design guidance, and site supervision to ensure compliance and long-term performance.