Installation Guidelines: Insulated Rendering Systems

It is recommended that the installation guidance from the render system manufacturer be consulted before installing products on site. Specific render systems require installation approaches that need due consideration. The guidance outlined below can be used in conjunction with the render system information.

  • The surface of the wall to which KORE External Insulation is to be mechanically fixed must be free of water repellents, dust, dirt, efflorescence and other harmful contaminant or materials that may interfere with the adhesive bond. Projecting mortar or concrete parts must be removed. A bedding compound can be used to even the surface of the wall before fixing the insulation
  • Install fixings in accordance with the external insulation system holder's NSAI certificate. More information can be found on the NSAI website.
  • KORE External Insulation boards must be butted tightly together
  • At openings and external corners insulation board edges should be mechanically fixed at a minimum of 300mm centres
  • To minimise the effects of cold bridging (thermal bridging), KORE External Plinth Insulation should be installed below the DPC level and where practicable, extend below ground level
  • The insulation thickness and detailing at floor level/below DPC to be in accordance with requirements contained in the appropriate Technical Guidance Documents as per relevant Building Regulations
  • Window and door reveals must be insulated to minimise effects of thermal bridging in accordance with the recommendations of the Acceptable Construction Details Document published by DoEHLG, to achieve an R-value of 0.6m2K/W
  • For retrofitting applications care must be taken to reduce thermal bridging at window cill details. The KORE EPS Cill significantly reduces the thermal bridging factor. Contact our team for further details.

Installation Guidelines: Insulated Cladding Systems

It is important to note that the method of installation of KORE External Insulation will depend on the facing or cladding system used on the building. It is recommended that installation guidance from the cladding system manufacturer be consulted before installing products on site.

  • In typical applications the wall is battened either horizontally or vertically, using treated timber
  • The timber is fixed at appropriate centres to provide the necessary support for the cladding or tile battens
  • KORE External Insulation is cut to fit tightly between the battens and should be wedged into position. Where an air gap is required between the insulation and the cladding, the insulation board must be pinned in place using corrosion free fixings
  • Next, a breathable sarking felt is placed over the insulation. The edges and joints are sealed
  • To satisfy Building Regulations, a second layer of KORE External Insulation is fixed over the battens. Where this is the case, it is essential to ensure that the cladding system is efficiently fixed back to the main wall to prevent downward drag of cladding. A double counter batten system should be considered. In this case the battens on the main wall must be in the same orientation as the cladding battens.
  • The specified cladding system is installed as per the manufacturer's recommendations and guidelines


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Cutting of EPS Insulation, Packaging and Storage

On-site trimming of boards where necessary to maintain continuity of insulation is easily executed using a fine tooth saw or builder's knife. Care must be taken to maintain the thickness, flatness and squareness of the board to achieve close butting of joints and continuity of insulation

KORE External Insulation boards must be protected from prolonged exposure to sunlight and should be stored under cover in their original wrapping, not in contact with ground moisture and raised above the ground level. Care must be taken to avoid contact with solvents and with materials containing volatile organic compounds such as tar and newly treated timber.



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