Making proper use of interior insulation systems

In the case of breathable interior insulation, the condensate concentration that occurs in the cross-section of the building component as a result of structural diffusion processes is absorbed by the sorption capacity of the function layer on the back side of the IDS Aktiv insulation board and returned to the room by means of the connected capillary-active lamellas.

In the case of mineral insulation boards, the condensate is absorbed by the cell walls of the air voids and returned to the ambient air by means of the natural drying behaviour of the mineral material. This functionality of the capillary-active insulation material requires full-surface adhesion of the insulation boards on a sustainable substrate.

The insulation value of both systems remains the same as the insulating air voids are never filled with water. In this manner, the moisture balance of the living area and the wall cross-section is regulated naturally. In this sense, both systems offer a high degree of application and system security as there is no need for the frequently problematic installation of vapour barrier foil. Functional security at all levels

For one, in terms of heat conductivity. The EPS-based system IDS Aktiv has a convincing ?-value of 0.035 W/(mK) for a lean system structure and maximum insulation in areas with limited space. The mineral-based insulating system IDS Mineral with a ?-value of 0.042 W/(mK) convinces with its building material class A in areas of application with corresponding fire protection requirements.

IDS Aktiv is an insulation board that is based on the standardised product EPS (DIN EN 13163) with capillary conductive lamellas. Coupled to the likewise conductive function layer of the back of the board, this produces the core piece of the insulating system.

The mineral insulation board is a massive, mineral-based and fibre-free thermal insulation material that is made of quartz sand, lime, cement and water. The ecologically and environmentally recommended insulation material corresponds to the European Technical Approval ETA-05/0179.

In the reveal area of doors and windows it is important to raise the surface temperature in order to prevent surface condensation, as due to the interior insulation, these areas are now considerably colder than before the insulating measure. This is why the reveal area should always also be insulated.

A condensate increase behind insulation of 10 or 20 mm is not to be expected as a result of the relatively minor decrease in temperature. Therefore no function layers are required. From a reveal insulation from 30 mm, we recommend the use of regular IDS Aktiv insulation boards.

With the implementation of the German Energy Saving Ordinance (EnEV) 2014 on 1 May 2014, the concrete U-value requirement for interior insulation has been dropped. Interior insulation measures can once again be planned on the basis of structural consideration and customer needs. In this sense, thicknesses of 6 / 8 cm IDS Aktiv and 8 / 10 cm IDS Mineral have proven to be effective.

Ventilating the rooms is just as important for the functionality of condensate-tolerating interior insulation system as it is without an interior insulation. With their system components, IDS Aktiv and IDS Mineral regulate the moisture in the room and in the wall construction. Ventilating the room transports the moisture back into the environment.

No, for the application case of interior insulation of outer walls, no general application permit is required, as however is the case with external thermal installation composite systems. Only deployed insulating materials that do not comply with any standards require material permit.

No, Capatect IDSystems are structurally and technically compatible. In view of the large number of systems on the market and their effects, the functionality of "mixed" systems cannot be ensured.

In old and new buildings on massive mineral substrates for:

• interior insulation of outer walls
• basement ceiling insulation
• Room-side "upgrade insulation" of concrete ceilings that only provide minimum insulation protection on the cold side.
   

YES! Fungus often develops in the area of thermal bridges on cool surfaces and in areas of high moisture. If the fungus was removed properly and professionally, interior insulation increases the surface temperature in this area and prevents the new formation of condensate.

Regular ventilating removes excessive air humidity. If the outer walls are properly insulated in the surface and detail and a brief shock ventilation is performed, instead of tilting the window, you not only prevent fungus from developing but you also save energy. It is important here to always ensure full-surface adhesion of the insulation boards to the substrate so that no air gaps form between the cold wall and the sorption layer of the insulation boards – this would serve as a new breeding ground for fungus!

Plaster with the tested mortar IDS Meistermörtel as reinforcement layer with fabric insert. For finishing surface design, vapour-permeable materials must be used:

• Felt plaster texture with IDS Meistermörtel as a surface for wallpapering.
• Textured fine plaster Strukturedelputze with a grain such as CT Mineralleichtputz K/R
• Thin-layered felt or adhesive felt plasters like CT Modellier- and Spachtelputz
• Smooth plasters such as Matador Feinputz.
• Silicate-based paints such as Sylitol Bio-Innenfarbe
• Dry plaster with plasterboards on wooden slats
• Wallpaper
   

No, due to the mineral function layer and the lamellas, the insulation plates must be cut to size with a fine-toothed ripsaw or suitable electrical cutting tools.

Tip from the expert:
The tools used to cut the Hochleistungsdämmplatte S024 are also very suitable for IDS Aktiv.

Light-weight, static loads of up to 4kg can be fastened with standard spiral / insulation anchors directly in the insulation material of the Capatect IDSystems. Heavy loads must be anchored through the insulation material to the substrate. Proven facade insulation system solutions can be adapted here (Montagequader, Fischer thermmax, etc.).

To process interior insulation on wall and ceiling, the substrate must be suitable for the adhesive, i.e. it must be clean and free from adhesive-inhibiting residues. Slightly sanded or strongly absorbent substrates are pretreated with Sylitol concentrate 111. Unsustainable old plaster, barrier layers or dense coatings must be removed. Major irregularities must be mechanically equalised or by means of a levelling plaster to ensure full-surface adhesion with the mortar IDS Meistermörtel tested by the system structure. Partial-surface adhesion is not permitted Moisture-sensitive wood materials and plasterboards as well as gypsum plaster are generally not substrates that are suitable for adhesives.

Only in the event of reduced load-bearing capability of the substrate may the insulation boards be secured in the centre with one plate anchor Ø 60 mm per board.

Exceptions:

• When using tiles as surface finish, both systems must be fastened through the fabric with 4 plate anchors each m² to safely transfer the high surface load. (Note: Max. 50% of the outer wall surface may be covered with tiles on an IDSystem so as not to impair the functionality of the system.
• If the IDS Mineral system is employed as ceiling insulation, it must be fastened with one anchor per board from an insulation board thickness of 140mm.
• If the IDS Mineral system is employed as ceiling insulation, and a reinforcement layer is applied, it must be fastened with one anchor per board.
   

Household kitchens and bathrooms are by definition not damp rooms. The moisture occurring in these rooms can be handled by both systems and the functionality is given. In areas with very high moisture loads, such as in pools, wellness areas, commercial kitchens, systems that tolerate condensate may not be used for insulation. In such cases, we recommend specially developed interior insulation systems, e.g. on the basis of vapour-proof foam glass insulation (e.g. Foamglas®).

No, the outer wall to be insulated must be dry. This means, it must have a functional damp proofing to prevent moisture from creeping up into the walls uncontrollably. The same applies mutas mutandis for the facade. The facade must be protected against driving rain. A prerequisite in the case of exposed masonry are intact joints and bricks. If necessary, a suitable water-repellent can improve protection against driving rain. (Note: Water-repellents are generally only effective for a limited amount of time and must be regularly replaced in accordance with manufacturer specifications!)

Plaster systems must also be checked prior to the fastening of the interior insulation. Any damaged spots must be repaired. A new water-repellent coating system can also improve protection against impact rain.

Explicitly yes. The IDS Thermowinkel was developed as an innovative solution for thermal bridge reduction on connecting inner walls and concrete ceilings and can be used in both systems equally effectively. Detailed thermal bridge verifications can be found in our thermal bridge catalogue

To avoid any unnecessary thermal bridges, sockets must be installed on the interior walls. If this is not possible, we recommend the use of the thermal bridge optimised IDS Electroquader. New electrical lines should always be installed on the substrate. The insulation boards can be slightly cut out and can, during the course of insulating, be glued full surface, just like the electroquader.

The temperature level in the wall is reduced by the interior insulation. Water-supply lines (e.g. heating pipes) are then sometimes in the areas susceptible to frost and must therefore be insulated according to standards or they must be installed on the inner side of the wall. Ducts in the area of the skirting are a possibility.

Before commencing with work, the wooden abutments must be checked in terms of functionality. Beams with existing damage, i.e. wet or rotting beans or torn ones must be replaced and the cause must be professionally eliminated. Generally, one can assume that the functionality of the wooden abutments are not decisively impaired by the interior insulation measure as they were already located in the cooler part of the construction prior to the measure.

Execution:

• Repair cracks in the wood e.g. with Histolith Sanopas
• Work the insulation material on the wooden beams with a gap of approx. 5 mm
• Void-free filling of the connection joint with hemp fibre
  TIP: Defibrate the IDS Hemp-felt insulation strips by hand
• Separate the reinforcement layer with a trowel groove
   

Yes, the systems do not only work one-dimensionally but also in the surface. However, the following specifications must be adhered to:

• Max. 50% of the outer wall surface may be covered with tiles
• Tiles must always be installed on the reinforcement layer and never directly on the insulating material
• For additional protection, approx. 4 plate anchors Ø 60 mm / m² should be placed through the fabric
• The surface weight must be limited to 20 kg/m²
   

For the interior insulation of timbered facades, we recommend to only use the interior insulation system IDS Mineral. In the case of exposed timbered facades, there is always a gap between the facade and the wood, which would result in a high amount of water absorption by the exterior wall. This water load can exceed the condensation via capillary-active interior insulation many times over. 

To ensure the drying potential of the timber framework, the insulating material thickness is restricted to 60 mm. In combination with the outstanding diffusion properties of the mineral insulation board, this results in a reliable system structure.

Our specifications are also based on the specifications of the WTA worksheet (8-5-00/D timber-framework repair in acc. with WTA V: interior insulation systems), according to which the additional inner thermal insulation should not fundamentally exceed a value of ?R_i = 0.8 (m²K)/W without further verification. 

In the case of clad timber-framework, in which e.g. board planking ornamentation takes over weather protection, an 80 mm IDS mineral insulation board can also be used. In any case, levelling plaster is required on the wall on top of the plaster and wood. In contrast to the common purely adhesive system structures, approx. 4 anchors /m² should be used for timber-framework buildings to fasten the system structure. Due to the somewhat lower load-bearing capacity and stability of the panels, wood dowels can be used in the area of the post.

The surface coating should be chosen so that the functional principle of the interior insulation is retained and moisture exchange is ensured. This means that vapour-permeable coatings are the coatings of choice.

Wallpaper is also possible; but has to be painted with silicate paint at a later time.