Interior insulation by Multipor
Interior insulation with the Multipor system is far more than just building cosmetics. Often, it is the only solution to improve the energy efficiency of a building and to operate the object economically in the long term.
Overview of interesting facts about interior insulation:
- Interior insulation, mineral and ecological
- Benefits of interior insulation
- Planning and processing interior insulation
- Video: Processing interior insulation
- PDF Downloads about interior insulation
- FAQ - Frequently asked questions about interior insulation
Interior insulation of exterior walls
Older buildings often have poor to terrible thermal insulation. In some cases, an exterior insulation is not possible or not desirable, for example because the facade is under historical protection, or because the distance to adjacent buildings is insufficient. These buildings can be energetically upgraded with an interior insulation using the Multipor interior insulation system WI, which has proven itself in the market for over 15 years. The exterior walls are insulated from the inside, with the benefit that expensive scaffolding is unnecessary, and that individual rooms and/or sections of the building can be independently insulated. The use of a Multipor interior insulation protects the building structure and avoids construction damage, increasing the fair value and the resale value for the long term.
Mineral and ecological interior insulation
At the core of the Multipor interior insulation system is the Multipor mineral insulation board. It is an ecological, mineral insulation material based on the raw materials sand, lime, cement, and water. Due to the special and purely mineral structure of the material, the boards provide an optimal combination of important characteristics: The insulation material is non-flammable and dimensionally stable. Multipor interior insulation also increases well-being throughout the building and prevents mold problems. Thanks to the breathability of the material, moisture is temporarily stored, then re-released into the ambient air.
Various certificates confirm excellent ecological and sustainable characteristics. For example, the certificate of the German Institute for Construction and Environment (IBU), or natureplus. Furthermore, the "A+" classification of the Eco Institute in Cologne confirms that Multipor mineral insulation boards are free of toxic emissions.
Benefits of Multipor interior insulation
- breathable and capillary-active – no additional vapor barrier required
- excellent insulation performance with λ= 0.042 W/(mK)
- flexible surface design
- purely mineral, free of fibers and toxic materials
- simple and safe processing
- tried and tested over a long time
- won numerous ecological awards
- value retention of the building
Planning and processing interior insulation
Function of a capillary active interior insulation with Multipor
Breathable, capillary-active systems such as Multipor allow for a vapor diffusion stream into the existing wall, absorb the occurring moisture, and re-release it into the room through capillary action. The moisture level of the insulated thereby remains permanently non-critical. The existing wall remains vapor-permeable.
Processing the Multipor mineral insulation board as interior insulation is fast, simple, and safe. The boards are lightweight, can be easily processed, and are free of fibers and toxic substances.
Processing video interior insulation with lightweight mortar
Film on interior insulation using the Multipor interior insulation system with lightweight mortar.
System component interior insulation
The Multipor interior insulation system WI offers a number of system components that are perfectly harmonized with the Multipor mineral insulation board.
Additional product information
Product data sheets
Product data sheet Multipor mineral insulation board
Product data sheet Multipor lime finishing plaster
Product data sheet Multipor interior silicate paint
Product data sheet Multipor reveal board
Product data sheet Multipor insulation wedge
Product data sheet surface texturing
Product data sheet fasteners
Product data sheet electrical installations
Safety data sheets
FAQs interior insulation
What are the benefits of Multipor interior insulation?
Multipor is a vapor-permeable and capillary-active interior insulation system with no vapor barrier or vapor retarder. It is an all-mineral and non-toxic insulation material, and is ecologically safe. The product declaration (EPD) of the Institute of Construction and Environment as well as the certificates of natureplus and the ECO-Institute (Standard A+: VOC-free) confirm that Multipor is environmentally friendly. Multipor mineral insulation boards WI are safe and easy to process, and as a Class A1 building material according to DIN EN 13501-1, they are non-flammable.
More about this in the Multipor Insulation Guide, starting on page 102
What is the thermal conductivity of Multipor interior insulation?
- Starting at an insulation material thickness of 60 mm, Multipor mineral insulation boards have a thermal conductivity value of λ = 0.042 W/mK.
- Multipor mineral insulation boards with an insulation material thickness of 50 mm have a thermal conductivity value of λ = 0.045 W/mK.
- Multipor mineral insulation boards Compact Plus have a thermal conductivity value of λ = 0.045 W/mK.
What is the difference between Multipor interior insulation and the Multipor interior insulation compact plus?
Both products represent a mineral, vapor-permeable, and capillary-active insulation material made of sand, line, water and cement.
While the Multipor interior insulation is available in insulation thicknesses of 50 - 300 mm, Multipor Compact Plus was developed especially for cases in which energetic improvement needs to be achieved with low insulation material thicknesses. It is available in insulation thicknesses of 30 and 40 mm, and serves to increase surface temperature and minimize thermal bridges, thereby increasing comfort in the home.
More about Multipor interior insulation in the insulation manual, starting at page 102
Is a vapor barrier or retarder required for the Multipor interior insulation system?
No. The Multipor interior insulation system (Multipor, Multipor with clay, Multipor compact plus) is a vapor-permeable and capillary-active system without vapor barrier or retarder.
What are the substrate requirements for Multipor interior insulation system?
The Multipor interior insulation system needs a sufficiently even substrate in order to ensure adhesion over the entire surface. The substrate also needs to be load-bearing, free of adhesion-reducing residue, and dry. Non-load-bearing old plasters, barrier layers, coats of paint, wallpaper, etc., must be removed in advance, and any faults must be corrected. Gypsum plaster on the substrate must be removed prior to insulating with the Multipor interior insulation system. An application on wood or metal is not permissible.
More about this in the Multipor Insulation Guide on page 131
How can uneven areas on the substrate be evened out during a Multipor interior insulation?
Uneven areas and faults in the substrate can be evened out using Multipor lightweight mortar. As an alternative, lime cement plasters of mortar group CS II according to DIN EN 998-1, with a pressure resistance of at least 1.5 to 5 N/mm², can be used. Drying times according to manufacturer specifications should be observed.
More about this in the Multipor Insulation Guide on page 131
What is used for bonding Multipor interior insulation?
Multipor mineral insulation boards are bonded exclusively with Multipor lightweight mortar and/or Multipor clay mortar, and across their entire surface. Bonding with tile cement or other mortars is not permissible. Only full-surface bonding prevents warm, damp ambient air streaming behind the insulation area, and also ensures a permanent building-physics functionality of the interior insulation. The thickness of the bonding layer of Multipor lightweight mortar and Multipor clay mortar is approx 5 mm.
Does Multipor interior insulation need to be anchored?
When bonding with Multipor lightweight mortar, Multipor generally does not need to be anchored. The prerequisite is a load-bearing substrate that is suitable for bonding.
Exceptions to this to this would be sandy, old plaster that has been treated with a silicate-based plaster solidifier, and tile-based surface design on Multipor. In these cases, Multipor must be fixed to the load-bearing substrate with Multipor screw anchors (4 per m²). Multipor WI must also be anchored when bonding with Multipor clay mortar.
In the case of timbered buildings, in order to avoid damage to the partitions, anchors should be fixed primarily to wood structure.
Does Multipor interior insulation have to be anchored as of a specific room height?
There is no specific room height as of which Multipor interior insulation WI has to be anchored. The requirements for bonding with Multipor lightweight mortar or Multipor clay plaster apply to the entire height of the room.
Which reinforcement mesh needs to be used with Multipor interior insulation?
When reinforcing with Multipor lightweight mortar, we recommend Multipor reinforcement mesh 4x4 mm, when reinforcing with Multipor clay plaster, we recommend Multipor reinforcement mesh 7x7 mm.
Our reinforcement meshes consist of alkaline-resistant glass-fiber meshes with a surface weight of 160 +/-5 g/m² (at 4x4 mm) or 105 +/-5 g/m² (at 7x7 mm). The requirement is 1.1 m² /m², since the edges of two rolls must overlap by at least 10 cm.
More about this in the Multipor Insulation Guide, on pages 129 and 144
What surfaces are possible when performing interior insulation with Multipor?
There are various possibilities for the surface finish of the Multipor interior insulation system – plastering, painting, wallpapering, tiling, even clay plaster and dry construction boards, are viable solutions.
More about this in the Multipor Insulation Guide, starting on page 135
Can loads be attached to the Multipor interior insulation?
Light static loads of ≤ 3 kg can be attached directly to the Multipor mineral insulation board using Multipor flat anchors. To do this, the flat anchor is tapped horizontally into the Multipor mineral insulation board with the open side leading. The supplied fastener is screwed into the middle of the corrugation.
Light static loads of ≤ 6 kg an be attached directly to the Multipor mineral insulation board using Multipor spiral anchors. To do this, the plaster, incl. reinforcement mesh, are slit with a cutter knife, and the spiral anchor (50 mm, 85 mm, 120 mm) is carefully screwed in using a Torx T40 bit. The max. applicable load depends on the length of the spiral anchor.
Loads > 6 kg and dynamically stressed loads are screwed into the substrate rather than the Multipor mineral insulation board. For this purpose, we recommend something like the thermally separated heavy-duty anchor Thermax by the Fisher company.
More about this in the Multipor Insulation Guide, pages 156-157
How can electrical installations be performed in Multipor interior insulation?
In order to prevent thermal bridges in an interior insulation with Multipor WI, electrical installations with switches, lines and sockets should, if possible, not penetrate the insulation, and should be installed in less sensitive areas such as interior walls. The use of so-called surface mounting systems (cable duct/ baseboard) is also possible.
If the above-mentioned method is not desirable or cannot be implemented, the following implementation guidelines should be observed prior to the actual insulation work:
- Exact determination of the location of switches, sockets, and junction boxes
- In the case of new installations, cables should be conducted and fastened to the existing wall or the substrate.
Sockets can be fastened to the Multipor interior insulation using the Multipor electrical accessories.
If lines are conducted along the existing wall, the Multipor mineral insulation boards must be accordingly grooved in the back prior to bonding. The electrical installation is basically fastened to the load-bearing substrate.
What happens with heating and water pipes through the interior insulation with Multipor?
The Multipor interior insulation will decrease the surface temperature of the existing wall. In its non-insulated condition, the existing wall was heated by the ambient air. After an interior insulation, the temperature in this area will decrease significantly. Due to the risk of frost, existing heat and water pipes should be mounted on the room side and on top of the Multipor interior insulation.
How is Multipor interior insulation connected to adjacent building components?
Multipor insulation wedges are used to reduce thermal bridges in the connecting area of the Multipor insulated exterior wall and the adjacent building components (interior walls or ceilings). The wedges are butt joined and bonded to the intersecting interior walls and ceilings. Processing is identical to that of the Multipor mineral insulation boards.
More about this in the Multipor Insulation Guide, starting on page 128
How are window jambs insulated in an interior insulation with Multipor?
Window jambs are insulated with Multipor reveal boards. These are available in thicknesses of 20, 30, and 40 mm. Processing is identical to that of the Multipor mineral insulation boards.
More about this in the Multipor Insulation Guide, starting on page 128
How is the reveal board connected to the window in an interior insulation with Multipor?
Multipor reveal boards can be connected to the window frame using a suitable window connection profile, which you can find in our current price list. You'll find suitable detail drawings in the download area.
What is the hemp-felt insulation strip needed for in an interior insulation with Multipor?
The first row of interior insulation with Multipor must be executed particularly flush and perpendicular. In addition, possible height differences to the adjacent floor structure must be taken into account.
Construction designs that may cause differing elongation behavior or settling (e.g. wood beam ceilings) require a decoupling strip for the building components.
Multipor hemp-felt insulation strips are especially well-suited for the optimal acoustic and elastic decoupling of the Multipor mineral insulation board when an interior insulation is performed against intersecting building components (ceilings, floors, or interior walls).
Is Multipor interior insulation suitable for the insulation of timbered buildings?
Multipor is suitable for the interior insulation of timbered buildings. The choice of adhesive mortar depends on the substrate. While Multipor lightweight mortar or Multipor clay mortar or clay plaster can be used on bricked partitions (mineral substrate), Multipor clay mortar must be used on clay plastered partitions.
Additional information can be found in our processing video on the interior insulation of timbered buildings.
Can Multipor interior insulation also be used in bathrooms?
According to DIN 4108-3, residential kitchens and baths as well as living and office rooms are generally considered to be "dry rooms". With normal usage, and through heating and ventilation, the average relative humidity in these rooms is not significantly higher than that in the living rooms, usually making additional insulation unnecessary. According to generally recognized technical rules and/or the current ZDB (German Central Association of the Construction Industry) guidelines, a liquid seal should be applied to the existing reinforcement plaster layer in splash water areas - e.g. behind bathtubs or showers.
Additional notes on this can be found in the current edition of the ZDB information sheet "Sealants in conjunction with tiles and boards".