extra insulation system for walls with existing thermal insulation


Product description

The system is designed for installation of the external wall insulation of buildings - in case when the existing external wall insulation is in bad condition and/or does not meet the current requirements for thermal insulation.

Main properties

    Enables achievement of the external wall thermal insulation required by building regulations - reduces heat loss and heating costs. Enables effective repairs of the thermal insulation systems - damaged due to design and installation errors, or as a result of the natural ageing and weathering processes.

Main parameters


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    The system is designed for installation of the external wall insulation of buildings - in case when the existing external wall insulation is in bad condition and/or does not meet the current requirements for thermal insulation.

    For thermal insulation with the use of polystyrene - enables insulation refurbishment by applying extra layer of thermal insulation material (in case of existing polystyrene thermal insulation systems).

    Recommended for thermal insulation works in the traditional constructions, energy- saving and passive ones.


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    A complete set of materials for thermal insulation installation - to be used in repairs of the main building insulation, provides full and checked compatibility of all components, which is particularly important during the subsequent years of system operation.
    Enables achievement of the external wall thermal insulation required by building regulations - reduces heat loss and heating costs.
    Enables effective repairs of the thermal insulation systems - damaged due to design and installation errors, or as a result of the natural ageing and weathering processes.
    Enables to install the thermal insulation of thickness up to 30 cm - this applies to the total thickness of the old and the new thermal insulation.
    Classified as fire retardant - in accordance with applicable regulations.


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    The thermal insulation technology is based on installation of an extra outer thermal insulation layer onto the existing external wall insulation. This system consists of polystyrene as thermal insulation material, reinforced layer made of adhesive and reinforcing mesh, a layer of render and decorative paint coat (optionally). Polystyrene boards are attached with the use of adhesive mortar and mechanical fixings. The use of mechanical fixings is obligatory regardless of the height of the building. ATLAS RENOTER is a system that is fastened mechanically, i.e. loads are completely transmitted by mechanical connections, and the adhesive provides a flat adherence of the system to the substrate (acts as an assembly). The construction material layer of the outer wall of the building should always be treated as the substrate, not the existing layer of thermal insulation. Fixings should therefore go through all the layers of the existing insulation. This fact should be taken into account during designing and selection of mechanical fixings.


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    According to the current regulations the thermal insulation system is considered in its entirety as one construction product, therefore it must be applied with the layers arrangement and with materials which are described in its technical approval. It is unacceptable to use the so called compilations or to use products from other systems or from other manufacturers, which are not covered by the technical approval.

    Insulation fixing Basic
    ATLAS STOPTER K-10 adhesive mortar
    ATLAS STOPTER K-20 adhesive mortar
    ATLAS STOPTER K-50 adhesive mortar
    ATLAS HOTER S adhesive mortar
    ATLAS HOTER U adhesive mortar
    Insulation material
    Polystyrene boards (EPS) of the minimum properties meeting the code:
    EPS–EN 13163–T1–L2–W2–S5–P5–BS75–DS(N)2–DS(70,-)2–TR100
    Caution. Boards of tensile strength TR80 may be used if are covered by the ITB Technical and Quality Recommendation or volitional Certificate issued by an approved assessment unit.
    Insulation fixing – additional
    Mechanical fixings authorized for use in construction works, obligatorily with a steel pin protected against corrosion or made of stainless steel.
    Reinforced layer
    ATLAS STOPTER K-20, ATLAS STOPTER K-50 or ATLAS HOTER U adhesive mortar with fiberglass mesh: SSA-1363-SM 05 or AKE 145.
    Outer (finishing) layer
    ATLAS CERMIT thin-coat render (mineral or acrylic) + ATLAS CERPLAST priming mass
    ATLAS SILKAT thin-coat render + ATLAS SILKAT ASX priming mass
    ATLAS SILKON thin-coat render + ATLAS SILKON ANX priming mass
    ATLAS ARKOL E façade paint
    ATLAS ARKOL S façade paint + ARKOL SX primer
    ATLAS ARKOL N façade paint + ARKOL NX primer
    ATLAS FASTEL NOVA façade paint


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    ATLAS RENOTER System has been granted the Technical Approval ITB No. AT-15-8477/2010.
    Domestic Declaration of Conformity No. 113 of 01.01.2011.
    FPC Certificate No. ITB-0456/Z.


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    Work conditions

    Carry out the work in dry weather, at the substrate and ambient temperature not lower than +5°C and not higher than +30°C. The only exception is the ATLAS STOPTER K-20 adhesive, which can also be used at 0°C, assuming that after 8 hours from the work completion the temperature does not drop below -5°C.


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    General instructions
    Before the work commencement is necessary to carry out an inspection at the site of the system installation, cataloguing and providing full evaluation of the technical condition of the existing insulation. The cataloguing should consist in completing the available documentation (design, construction log, etc.), determining the type of wall partition and construction material used, the type and thickness of the insulation used, verification of the mechanical fixings use and checking the type of the surface layer and whether it was painted. It is recommended to carry out excavations, the number depending the size of the building, preferably on each wall of the building. Assessment of technical condition of the old thermal insulation should determine the current condition of the individual layers of the system, their adhesion to the substrate and interlayer one and should allow to establish and identify the type and extent of damage. Basing on the information gathered, appropriate for the situation, technology of thermal insulation work and the method of preparation of the existing thermal insulation should be chosen. Caution! For buildings with three-layered reinforced concrete walls, making an additional layer of insulation should be preceded by a service inspection in accordance with the recommendations in this regard, including ITB Instruction No. 360/99, 371/02, 374/02 and 447/2009. For the time of works remove any elements hindering tight adhesion of the thermal insulation boards and the finishing coat application. An additional layer of insulation will increase the thickness of the walls, and therefore it will cause the need to increase the reach of flashings, downspouts anchors, etc. For the time of works the windows and doors should be protected against the dirt by a plastic film.


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    Polystyrene boards application
    In the case of even substrates, the mortar can be applied with the use of a notched trowel (with notch size 12 mm)– the adhesive is applied then directly onto the board and not onto the substrate. In the case of less smooth surfaces the adhesive should be spread on the board surface using the “strip - point” method. It consists in the application of continuous circumferential bead (at least 3 cm wide) at the edge of the board and 6÷8 patches of 8÷12 cm in diameter evenly distributed on the whole surface. Peripheral bead is placed at a distance from the edge, so that when pressed to the wall the mortar is not squeezed out of the contour and side edges. The adhesive mortar applied on board should cover at least 40% of its surface (after pressing down to the substrate at least 60%). Thermal insulation application should commence from the building corners. The first row of the boards is fixed on the starting tracks, the subsequent rows positioned so that the vertical board joints are staggered and overlapped at the building corners. It is unacceptable to fit the edges of the insulation boards with the edges of the reveals on the façade. As the adhesive is applied, the board should be placed onto the substrate, moved tightly to the already fixed boards and pressed – be sure to control the plane with a level. If the adhesive is squeezed out the board contour, it should be removed. If there are gaps between adjoining boards, we recommend filling them with cut stripes of polystyrene or low expansion polyurethane foam.
    Insulation boards sanding
    The surface of insulating boards applied to the substrate should be even, so when the mortar sets (after ca. 24 h), the boards should be sanded with the use of sanding boards or floats covered with coarse sanding paper. It eliminates any board edges slips. In the case of polystyrene boards installed 3 months earlier or more sanding and removal of any surface tarnish is mandatory.
    Mechanical fixing
    Fixing with mechanical anchors (with pins of steel protected against corrosion or of stainless steel)can commence after ca. 24 hours from the boards application. We recommend using screwed - in fixings, in the amount of minimum 4 - 6 pieces per m² of the façade. Fixings length should be the sum of the total thickness of the old thermal insulation and new insulation material designed, whereas the anchoring depth in the mineral substrate should be clearly defined in the technical design of thermal insulation.
    Note! As the bearing substrate the layer of construction material of the outer wall of the building should be considered.. Detailed information about the number of fixings, their distribution, length and depth of anchorage should be specified in the thermal insulation technical design and should meet the requirements of the fixings manufacturers.
    Installation of additional elements
    In order to increase the system resistance against mechanical damage, to allow free drainage and execution of expansion joints - the finishing profiles should be installed on the fixed thermal insulation layer. These profiles are installed at every specific locations of the façade (i.e. corners, reveals, sills, etc.). They can also be simultaneously installed during the base coat mesh embedding. For profiles embedding, use adhesive mortars ATLAS STOPTER K-20, ATLAS STOPTER K-50 or ATLAS HOTER U. The layout of the existing thermal insulation expansion joints should also be preserved by applying appropriate expansion joint profiles with mesh.
    Reveals corners strengthening
    In all corners of window and door reveals, additional reinforcing mesh strips (rectangles with dimensions of 20 x 35 cm) embedded in the adhesive mortar ATLAS STOPTER K-20, ATLAS STOPTER K-50 or ATLAS HOTER U should be installed. The strips should be applied diagonally, at a 45° angle in relation to the line set by the edges of the reveals.
    Base coat (reinforced layer) application
    The base coat can be installed once the adhesive mortar used for board application has sufficiently set and any necessary additional mechanical fixings have been installed (after three days on average). Apply the adhesive mortar onto the surface of the installed insulation boards and spread it using a notched trowel (notch size 10 - 12 mm). The adhesive should be spread in vertical strips of width slightly greater than the fiberglass mesh width. Then, starting from the top, subsequent strips of mesh are applied and in a few points along the entire length embedded in the prepared adhesive layer. The adjoining strips of mesh should overlap horizontally and vertically by a minimum coverage of 10 cm (15 cm in quoins). Mesh overlaps should not coincide with the joints between the insulation boards. When applied, the mesh should be carefully embed in the adhesive. In order to embed the mesh evenly, the adhesive is squeezed with the slightly inclined trowel led from the top, in the direction from the center to the mesh strip side. The correctly embedded mesh should be completely not visible under adhesive coat and should not be in direct contact with the polystyrene boards surface.
    Façade finishing
    The outer layer of the system may be a thin-coat render solely or a thin-coat render coated with a façade paint. The choice of the render should be carried out including the insulated walls heat - and – moisture calculation as well as the conditions of thermal insulation system usage. The execution of the finishing layer can start after ca. 3 days from the reinforced layer installation. The base coat surface should be primed with a priming mass adequate for the render type - for mineral
    and acrylic renders – ATLAS CERPLAST, for silicate renders – ATLAS SILKAT ASX, for silicone renders – ATLAS SILKON ANX. If the reinforced layer was installed with the use of ATLAS STOPTER K-50 adhesive mortar, no priming mass is needed. You can use thin - coat render: ATLAS CERMIT (mineral or acrylic), ATLAS SILKAT (silicate) or ATLAS SILKON (silicone). The renders surface can be painted optionally with ATLAS ARKOL E, ATLAS ARKOL S, ATLAS ARKOL N or ATLAS FASTEL  NOVA façade paints. All works must be performed in accordance with the technology described in the technical data sheets of the individual products.


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    The above information constitutes basic guidelines for the application of the product and does not release the user from the obligation of carrying out works according to engineering principles and OHS regulations.

    At the time of publication of this product data sheet all previous ones become void.

    Date of update: 2013-11-12

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    extra insulation system for walls with existing thermal insulation

    Current documentation