Features of ceiling insulation with mineral wool

To reduce heat loss in the living space, it is necessary to insulate the floors. This applies not only to the walls, but also to the ceiling. Currently, there are many different insulation materials with different characteristics and costs. One of the most popular and effective insulation materials is mineral wool. Let’s get to know this insulation better and consider what features it has.


Mineral wool is a special category of inorganic insulation that has a fiber structure. Such products are created from rocks, slag and glass.

Such heat insulators are responsible for “fixing” the warm air layer, perfectly isolating the living space from the cold. Mineral insulation mats are made up of a huge number of tiny fibers that intertwine with each other in a specific order..

There are several subtypes of mineral wool. However, regardless of the type of materials, the principle of their production is approximately the same. In the manufacture of this insulation, only non-combustible components are used..

When creating mineral insulation, the following technologies are used:

  • blowing;
  • centrifugal roller;
  • centrifugal casting;
  • centrifugal-spinning-blowing and other high-tech techniques.

Modern mineral wool is produced in rolls, plates and cylinders.

Ceiling insulation must be done in order to extend its service life and protect it from the destructive effects of moisture and condensation. In addition, it is worth considering that warm air can leave the premises, rising upward, so there must be a reliable barrier waiting for it. If the insulation layer is installed correctly, then the heat will not be able to leave the living space..

A home with a well-insulated ceiling always maintains a comfortable microclimate. Being in such conditions is comfortable and safe for health..

Mineral wool insulation can be done both inside the home and outside. Both types of work can be done by hand, without resorting to expensive specialist services. The main thing is to choose quality materials and strictly adhere to the plan of action. Then the result will not disappoint you..

Advantages and disadvantages

Mineral wool is one of the most popular heat insulators. It is chosen by many consumers due to its many positive characteristics:

  • Mineral wool provides excellent thermal insulation. This insulation is characterized by low thermal conductivity, so it is permissible to use it in a variety of areas. In this case, the weather conditions can be absolutely any. In addition, mineral wool does not require additional insulation..
  • This insulation is waterproof. For example, high-quality basalt and glass wool (a variety of mineral wool) perfectly let steam through, but do not absorb moisture. Due to this feature, areas insulated with similar materials are reliably protected from dampness..
  • Mineral wool is not afraid of aggressive chemicals. High quality insulation does not collapse or deform when in contact with acids and alkalis.

  • Such a heat-insulating layer is also distinguished by the possibility of air exchange. Mineral wool is a “breathing” raw material that provides air circulation in the surrounding space. This material virtually eliminates condensation.
  • Mineral wool is also distinguished by good sound insulation characteristics. This heat-insulating material has a special elastic structure, which ensures its acoustic qualities..
  • This material is recognized as fire resistant. Even in the event of a fire, mineral wool will not support combustion and promote the spread of fire. Moreover, when colliding with a flame of mineral wool, it does not exude corrosive smoke..

  • Mineral wool is a durable material. Its service life is on average 25-50 years. Such a heat-insulating layer is not exposed to “invasions” of rodents and parasites, and various microorganisms do not multiply in it..
  • Such a heat insulator is considered environmentally friendly. It can be laid out without fear on the ceiling in a private house or apartment. Mineral wool contains no hazardous chemicals that adversely affect human health.
  • It is worth noting that mineral wool is a very durable material with reliable fibers. Such a heat insulator easily withstands impressive loads without losing useful properties..
  • Minvata is not a rare material. It can be found in any hardware store..

Despite the many advantages, this heat insulator also has disadvantages:

  • When wet, mineral wool loses its positive qualities. When this material absorbs moisture, it loses some of its thermal insulation properties..
  • Also, the heat insulator has a lot of dust. This minus is noticeable when laying glass wool or slag wool. Such materials have brittle fibers and their shards are thin and sharp. If they get under the clothes of the master, then they provoke unbearable itching and skin irritation. In addition, it is very harmful to breathe air in which there are particles of insulation. Due to these shortcomings, it is recommended to work with such a product only in special clothing and goggles..
  • Some experts argue that mineral wool can negatively affect human well-being, as it releases phenol-formaldehyde resins. However, many studies have shown that the content of toxic compounds in this insulation is too low to harm health..

Characteristics and composition

    Another name for mineral wool is stone wool. The main characteristics of this popular thermal insulation material are:

    • low thermal conductivity;
    • not susceptible to decay;
    • non-susceptibility to shrinkage (neither natural nor thermal);
    • heat and sound insulating qualities.

    In the manufacture of mineral wool, non-combustible components are used. They melt at a temperature of +1500 degrees. When a fiery liquid substance is obtained from these ingredients, fibers of different sizes are released from it..

    Today, mineral wool is sold by many well-known manufacturers.. This material can contain several main components:

    • The heat insulator can be based on different rocks. Gabbro-basalt and carbonate rocks are metal products. They are used as raw material for making glass wool fibers. 90% of the content of this material is rocks, and the remaining 10% is impurities.
    • To make the fibers of the insulation more viscous, special binders are added – phenol-based resins, bentonite clay.
    • The top of the insulating material is covered with a very thin paper layer. As a rule, special kraft paper is used for this, combined with aluminum or polyethylene..

    All of these components are the main ones in the content of mineral wool. The lion’s share of such heat insulators consists of them. To find out what kind of mineral wool is in front of you, and what ingredients it contains, you should read the information on the package..

    Preparatory work

    Before insulating the ceiling with mineral wool, it is necessary to prepare the base. To do this, you will need the following materials and tools:

    • insulation (it is advisable to purchase mineral wool in slabs, because it is denser and easier to install);
    • wooden bars for the frame;
    • fasteners;
    • suspensions;
    • ladder;
    • level.

    For fixing mineral wool, you need to purchase a special glue. To protect the material from getting wet, it is recommended to prepare a vapor barrier.

    Before installing the insulation, it is recommended to remove the old finishing coatings from the ceiling. If there are traces of mold or mildew on the base, they must be removed. After that, the ceiling should be trimmed with soil..

    Frame fabrication

      The frame for laying the heat insulator can be made by hand. However, first you need to mark the ceiling base..

      Few ceilings have unrivaled horizontal alignment, so floor-to-ceiling measurements need to be taken at multiple locations. The smallest value should be taken as a basis. Further, on the floors, you need to set marks and connect them with a line, constantly monitoring the horizontal.

      Following the guidelines, it is necessary to fasten the bars or metal profiles. If the walls are made of wood, then you need to fasten the parts with self-tapping screws. If the floors are denser, for example, concrete, then you can fix the frame using dowels.

      Then you should start fixing the intermediate components of the frame structure. They must match the height of the rails already on the walls. If the lathing is wooden, then pieces of wood need to be placed under the bars to create horizontality. If the mineral wool is a slab, then the intermediate parts of the frame must be installed so that the slab fits snugly between them..

      Insulation technology

      For thermal insulation, the mineral material can be placed both indoors and outdoors. Let’s consider step by step how such work is done.

      From within

      To put mineral wool from inside the home, you must:

      • make a frame;
      • put waterproofing;
      • make a vapor barrier;
      • lay out insulation;
      • lay out the finishing cladding – gypsum plasterboards.

      It is not necessary to do waterproofing inside the room, especially since it will deform when arranging the frame.


      Sometimes it is not possible to put insulation from the inside. In this case, it is necessary to refer to the method of external laying of the heat insulator. For outdoor work, you do not need to choose the type of frame (metal or wooden), since you simply will not need it.

      The work includes several stages:

      • free the attic from debris and unnecessary items;
      • remove dust and dirt;
      • lay a waterproofing material (it must be laid with an overlap of 10-15 cm);
      • fasten the joints with tape;
      • the vapor barrier material must be brought on the sides to a height of 15-20 cm (if possible), and then secure it with tape or slats;
      • lay the mineral wool (it is better to lay out the insulation in 2 layers);
      • the upper layer must be placed so that it covers the joints of the lower one;

      • in the attic, experts advise using insulation in a roll (it will not be possible to put plates everywhere);
      • the heat insulator must be tightly laid out between the beams along their upper edge;
      • in this case, it is not required to close the heat insulator, except for those cases when the organization of living space is planned in the attic.

      For information on how to properly insulate the ceiling with mineral wool, see the next video.

      Useful Tips

      • A thermal imager can be used to determine if the heat insulator is laid out correctly. If the work was performed poorly, and the mineral wool subsided, then on the device all the affected areas will have a red color.
      • It is recommended to use hardened steel self-tapping screws for the ceiling sheathing. These parts are distinguished by excellent strength characteristics (they are not afraid of heavy loads).
      • Never press stone wool, as the thermal insulation properties of this material are provided by bubbles in its structure..
      • If it turns out that the heat-insulating material is on a level above the beams, then additional bars need to be nailed to them. In this case, it is necessary to take into account the thickness of the insulating layer.

      • If you install mineral wool in two layers, then the room will be much warmer. In this case, the method of laying insulation will be similar to laying a brick – the upper layer will overlap the joints of the lower.
      • In areas where spotlights will be installed, it is necessary to leave a small space for air circulation. This will help avoid problems associated with frequent burnout of light bulbs..
      • If you are insulating a flat roof, then it is recommended to buy mineral wool in the form of slabs and lay this material in two layers..
      • External insulation of the ceiling is recommended to be carried out in those rooms in which there is a free exit to the outer half of the ceiling structure.

      • When choosing the thickness of mineral wool, you need to pay attention to its density. If this parameter is 50 kg per 1 cubic meter, you can look for thicker material..
      • It is possible to insulate the ceiling with mineral wool not only manually, but also using a special blowing machine.
      • It is recommended to insulate the ceiling with mineral wool in the summer. This will make it easier to remove excess moisture and condensation..
      • You can proceed to finishing the ceiling only after all layers of glue are completely dry. At the same time, it is permissible to paint mineral wool, plaster and even cover with such material as siding..

      About the author