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weber.therm EMS

weber.therm EMS
weber.therm EMS

Product benefits

  • Durable
  • Weather 'tightness'
  • Aesthetic performance
  • Practical

The system is designed by Weber in conjunction with Specifiers on a project specific basis. The installation of the system is carried out by installers who have been trained and accredited by Weber. 

Weber offers a ten-year materials guarantee, subject to certain terms and conditions. The Contractor offers a workmanship guarantee in accordance with the NHBRC. All system components shall be supplied by Weber unless specifically otherwise agreed.

Product Features


The systems are for use as external insulation on commercial and residential buildings, which are designed in accordance with the general building regulations.

General manufacture, supply and installation

Weber is responsible for the specification of all systems components to Weber approved specifications. Where products are manufactured by Weber, these components will be specified and used. Where components are outsourced – these will be in accordance with the Weber approved ‘supplier’ system. Weber accredited contractors are responsible for the installation of the specified systems, in accordance with Weber project specific ‘Site Project Pack’ including the Applications Guide.

Quality Control

The Certificate Holder operates a quality management system (ISO 9001 & 14001) and a quality plan is in place for system manufacture, design and installation.

Delivery, Storage and Marketing

Insulation materials are delivered to site in pack form. Each pack is marked with the manufacturer’s details, product identification marks and batch numbers.

All Weber ETICS system related components must be stored on a firm, clean, dry and level base, which is off the ground. The insulation should be protected from prolonged exposure to sunlight by storing opened packs under cover in dry conditions or by re-covering with opaque polythene sheeting.

Care must be taken when handling the insulation boards to avoid damage and contact with solvents or bitumen products. The boards must not be exposed to ignition sources. Metal lath, renders, paints, textured synthetic finish coatings and sealants should be stored in accordance with the manufacturer’s instructions, in dry conditions, at the required storage temperatures. They should be used within the stated shelf life.

Strength and Stability

  • The system should be designed to withstand the wind pressures (including suction) and thermal stresses in accordance with existing building regulations.
  • The system must have adequate resistance to severe mechanical or malicious impact and abrasion where walls are exposed, and be provided with some form of protection.
  • The design should take into account damage resulting from impact by motor vehicles or other machinery. Preventative measures such as the provision of protective barriers, or kerbs, need to be considered.

Behavior in Fire

Internal fire spread (structure)

  • The masonry or concrete structure, to which the weber.therm EMS system is applied, shall be designed to provide the necessary fire resistance.

External fire spread

  • With regard limitations on use of combustible materials, walls must comply with existing Building Regulations.
  • Fixings to be provided at the rate an average of 5.2/m2 of insulation (EPS or Neopor). The fixing design should take account of the extra duty required under fire conditions.
  • Vertical and horizontal fire barriers shall be provided at each compartment floor and wall, including the second floor level of a three-storey single occupancy house. Fire breaks should be bonded to the substrate using adhesive and be mechanically fixed using stainless fire-rated fixings at 300 centres.
  • The fire barrier should be of non-combustible material i.e. mineral fibre, continuous and unbroken for the full perimeter of the building and for the full thickness of the insulation.

Proximity of heat producing Appliances

  • The building construction must comply with existing Building Regulations, particularly with regard to proximity of combustible materials to Flues.

Thermal Insulation and R-values

  • Assessments were carried out to verify that the requirements of Building Regulations Part L can be achieved using weber.therm SFS and EMS.

Condensation Risk

The Specifier should identify all areas where there is a significant risk of interstitial condensation due to high levels of humidity (particularly relevant in coastal regions). A condensation risk analysis will also be carried out by Weber, to reduce the risk of surface condensation to acceptable level.


  • Adequate provision should be made, in the initial design phase, for access for inspection and maintenance, over the life of the building.
  • The system shall be inspected and maintained in accordance with the Certificate holder’s instructions, as detailed in the Repair and Maintenance Method Statement.
  • Repairs should be carried out in accordance with the Weber Method statement for ‘Inspection and Repair’ Repairs to plumbing etc. should also be carried out as required to prevent deterioration or damage, and to protect the integrity of the system.
  • Synthetic finishes may be subject to aesthetic deterioration due to exposure to ultraviolet light. They should be re-painted every 8 to 10 years to maintain appearance. Care should be taken to ensure that the paint used is compatible with the original system and that the water vapors transmission or fire characteristics are not adversely affected.
  • Sealants shall be subject to regular inspection (at least annually). They should be replaced as required and fully replaced every 8 to 10 years to maintain performance.

Weather 'Tightness'

  • When designed and detailed in accordance with this Certificate, the system will prevent moisture from the ground coming in contact with the insulation.
  • An acrylic resin bonded render has adequate resistance to water penetration, when applied in accordance with the Certificate holder’s instructions.
  • Recommendations for detailing at windows and doors have been assessed and are considered adequate to ensure that water penetration will not occur, assuming that regular maintenance is carried out.


Design Life

An assessment of the life of the system was carried out in the UK. This included an assessment of design life and installation controls

  • Proposed building heights
  • Render thickness and specification
  • Material specifications including the EPS, Metal Lath, Beading and Fixings - specifications
  • Joint design;
  • Construction details;
  • Maintenance requirements;
  • Accelerated aging test data.

The assessment indicates that the system should remain effective for at least 50 years, providing that it is designed, installed and maintained in accordance with this certificate. Any damage to the surface finish shall be repaired immediately, and regular maintenance shall be undertaken as stipulated.

Aesthetic Performance

As with traditional renders, the aesthetic performance of the system, e.g. due to dis-coloration, soiling, staining, algae growth or lime bloom is dependent on a range of factors such as

  • The type, color and texture of surface finish;
  • Water retaining properties of the finish;
  • Architectural form and detailing;
  • Building orientation/elevation;
  • Local climate/exposure conditions/atmospheric pollution.

Adequate consideration should be given, at the design stage, to all of the above, to ensure that the level of maintenance necessary to preserve the aesthetics of the building is adequate.

Practical Considerations

The practicality of the construction process as well as the adequacy of site supervision arrangements needs to be assessed, before the design stage is completed.

Tests and Assessment

Tests and assessments need to include the following;

  • Structural strength and stability
  • Behavior in fire
  • Resistance to impact
  • Pull out resistance of fixing.
  • Thermal resistance
  • Condensation risk
  • Durability of components

Other investigations

  • The manufacturing process was examined including methods adopted for quality control, and details were obtained of the quality and composition of the materials used.
  • Special building details (ground level, window and door openings and movement joints) were assessed and approved for use in conjunction with this Certificate.
  • Site visits were conducted to assess the practicability of installation.
  • Site visits were conducted to assess performance in use.
  • No failure of products in use, have been reported to Agrément SA.


Send or download the documentation

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



Contractors, and shall be in accordance with the Project Pack as well as the requirements outlined in the Specification.

  • Weber is to prepare a bespoke ‘Project Pack’ for each project, including theoretical R-values, requirements for materials handling and storage, method statements for installation, building details, fixing requirements, provision for impact resistance maintenance requirements etc.
  • The ‘Project Pack’ will form part of the contract documentation for circulation to the Client , Professionals and the Main Contractor. Contractors will be expected to adhere to the specification. Deviations must be approved by a Weber technical representative.
  • Weber’s Product Manager and Technical staff will visit the site on a regular basis to ensure work is carried out in accordance with the Weber project specific ‘Project Pack’.
  • All windows must be installed and made weather-tight within the designated opening.

Site survey and preliminary work

  • A pre-installation survey of the property shall be carried out to confirm suitability of substrate for application, modifications required, pullout resistance of proposed mechanical fixings by selected Engineer by the approved sub - contractor etc.
  • Internal wet work e.g. screeding or plastering, should be completed and allowed to dry, prior to system application.


  • Conditions for installation: Installation work must be carried out at a temperature ranging from +5 to +30 °C (ambient-air temperature and temperature of the substrates). The works may not be carried out in rain or strong wind conditions. The applied materials must be protected from rain, frost, strong wind and direct sunlight until fully hardened, for at least 72 hours. The above mentioned conditions must be secured by suitable technical measures and organization of works (for example, by additional shading of the area exposed to direct sunlight).
  • Substrate: The steel framework (if applicable) shall be designed by a structural engineer. The sheath wall shall be installed according to the manufactures specification. Sheath wall joints shall be covered using a polysulphide sealant. The maximum allowable deviation of the flatness of the sheath wall is less than 10mm/m.
  • Execution of works: When attaching Weber ETICS to adjacent sheath wall, crack formations and water penetration to Weber ETICS must be prevented. For this purpose, strip sealants, stop beads, expansion beads or waterproofing membranes shall be used.

    In order to prevent water penetration into the system, it is advisable to install perforating elements in a decreasing pitch from the substrate towards the external surface of Weber ETICS Flashing shall be fitted according to the construction documentation before or during the installation of Weber ETICS.

    The design of flashing must take into consideration eventual negative corrosive interaction of different materials. Plumbing elements must be fitted in such a way so as to ensure that the edge of the Drip Molding is placed at least 40 mm in front of the finishing coat of the future Weber ETICS, and in the required pitch.
  • Fixing drainage tray: Drainage trays and stop beads must be fitted before bonding of the insulation panels. The drainage tray must correspond to the thickness of the thermal insulation panels. The drainage trays shall be connected together with couplings and tight butt joints. The drainage tray shall be attached to the substrate by anchors with spacing of approximately 300 mm. Eventual uneven surfaces of the substrate shall be leveled by adjusting shims. Drainage tray on corners should be mitred or shall overlap and shall be connected together with couplings.
  • Bonding of Neopor/EPS Boards: The adhesive substance shall be applied on the sheath wall using a 6 x 6 mm notched trowel. The groves shall run in a vertical direction. The adhesive substance shall be applied onto the Sheath wall in the form of continuous vertical layers at 300 mm centres and 50 mm on either side of the Neopor/EPS joints. The minimal width of the layers is 30 mm. The panel is subsequently pressed onto the substrate using constant force. Neopor/EPS panels should be bonded from bottom to top, the longer side should be placed horizontally and panels should be installed in strips, even when covering corners. All joints shall be staggered. All vertical joints shall be on the framework.

    Formation of straight joints in aperture corners is not recommended. It is recommended that the insulation panels be to bond the on the corners so they overlap by 5 -10 mm. Cut and sand them if necessary, after the adhesive has cured. Insulation panels shall be butted tightly. Any joint exceeding 2 mm are filled with polyurethane foam. Flatness of the external surface of the insulation material must be preserved.

    Off-cuts of the panels may be used, provided that they are placed separately within the area covered by ETICS, never on corners, angles or terminations of Weber ETICS and in the proximity of ‘openings’ and can be fixed to the steel framework. Achieving of the vertical dimension may not be compensated for by stacking off-cuts above one another.

    When fitting insulation panels in the proximity of apertures, it is recommendable to install them in such a way so as to cover the cuts of the insulation material bonded to the lining of the apertures. The entire surface of the Neopor/EPS panels shall be leveled after curing of the adhesive material with a sanding scratcher and cleaned properly by sweeping. If the base coat is not applied within 14 days, the surface must be sanded again.
  • Mechanical fixing anchors: The Anchors are designed only for 100% wind load and does not support transfer of other loads. The anchors shall be used to fix the Neopor/EPS boards to the steel framework and brick work. The number of anchors/m² shall be determined by static wind calculation. Anchors shall be fitted after the adhesive substrate has set. Within 6 weeks, the Weber Base Coat X-treme must be applied to cover the anchors; otherwise damage of anchors by UV radiation may occur. The anchors shall be set in a depression.

    Improperly fitted (unstable, protruding, deformed or otherwise damaged) anchors must be replaced by a new one anchored in close proximity. The improperly fitted anchor shall be removed. The hole left in the Neopor/EPS panel shall be filled with the applied thermal insulation material or polyurethane foam. If it is impossible to remove the anchor, it shall be arranged so it does not disrupt the flatness of the base coat.
  • Finishing-Applying of the Weber Base Coat X-treme: It is necessary to protect the adjacent constructions, flashing and fittings and perforating elements against contamination. Stop angles and expansion beads, or strengthening reinforcement shall be fitted to the insulation panels. Both the beads and the strengthening reinforcement are fitted by pressing them into the applied layer of base coat. Zones of anticipated concentrated tension - openings – shall be reinforced by cuts of Glass-fibre Mesh of the minimum dimensions of 300 x 200 mm, placed diagonally in the corners. When applying the strengthening reinforcement to raise the resistance of Weber ETICS against mechanical damage, the strips of the Glass-fibre Mesh shall be fitted with overlapping joints -100 mm overlap.

    The Glass-fibre Mesh shall be usually applied to the entire surface from top to bottom; the strips must overlap at least by 100 mm. In the case of double reinforcement, the whole process must be repeated before drying of the previously applied layer.

    The joint along their circumference of fixtures and fittings shall be sealed using a proprietary backing and polysulphide sealant.
  • Finishing-Applying of the Acrylic coating: The acrylic coating shall be applied on a dry and clean Weber Base-Coat X-treme. The acrylic coating shall be applied within a single set of work operations by a sufficient number of workers. The works can however be interrupted when working on borderlines of surfaces with different colors, on angles and other edges. It is necessary to protect the adjacent constructions, flashings and fitted/protruding elements against contamination (For example, by a masking tape which is to be removed immediately after the acrylic coats are finished. Acrylic coating of the same production batch shall be used to achieve the same color all across the Weber Base Coat X-treme surfaces.
  • Base beads and all full system beads are to be fixed as specified. Insulation, ‘render only’ beads and Lath are fixed as specified in the ‘Project pack’.
  • The base coat is mixed and applied, to achieve the appropriate thickness (2 - layers of 3 - 4 mm each).
  • The top coat is mixed and applied to a minimum thickness of 2 mm thick.
  • If an additional synthetic finish is required, the primer is applied to the topcoat prior to the application of the selected textured coating.
  • Mechanical fixings are provided in accordance with the project specific design requirements.
  • Application of the base coat and finishes must be carried out within the permitted temperature range (as stipulated on the packaging) and should be protected against rapid drying from extreme heat.
  • Movement and ‘day’ joints shall be provided in accordance with the engineers requirements. The recommended panel size is 45 - 50 m² with an aspect ratio of no less than 4:1.
  • At all locations where there is a risk of the EPS being exposed, e.g. window reveals, eaves or stepped gables, the system must be protected e.g. by inadequate overhang or by purpose made sub-cills, seals or flashing.
  • Care must be taken in the detailing of the system around openings and projections.
  • On completion of the Weber ETICS installation, external fittings and rainwater goods etc are fixed though the system into the structure, in accordance with the Certificate holder’s recommendations.