Aug 16, 2022
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How to insulate the ceiling in a private house

How to insulate the ceiling in a private house

Our main topic today is the insulation of the ceiling with a minavt in a private house. This insulation has been one of the most popular and effective for many years. today we will consider its advantages, disadvantages and find out how to work with it correctly.

Insulate the ceiling with mineral wool

In general, the insulation of the ceiling in a private house from the side of a cold attic is the most urgent construction issue. Most of the heat loss comes from the ceiling. Why? you might ask. Everything is simple. remember the 7th grade physics course: heated air always tends to rise. And even if you have already graduated from school, no one has canceled the laws of physics yet – alas, they are with us forever.

As you might think, the determining factor that affects the preservation of precious heat (especially in harsh winter times) is the thickness of the insulation. Of course, yes, this factor affects, but it’s not just about the thickness. If the insulation is laid according to the wrong technology, then in winter it will help you, as, perhaps, a photograph of a lifebuoy will help a drowning man.

But, as is customary on our cozy repair and construction portal, everything is in order. First, we will consider in detail the properties of this insulation, and only then we will analyze how to insulate your home, moreover, to do it right.

Properties of mineral wool

Let me make one small digression from the topic right away: the information presented in our article will be useful to owners of private houses, avid summer residents and residents of urban-type apartment buildings who decide to insulate a balcony / loggia. Warming the apartment with mineral wool on the top floor is not the best solution. In this case, it is better to use foam. As the text progresses, you will understand why everything is so.

So, mineral wool. It will cost you a little cheaper than foam. It is sold in hardware stores, rolled into rolls or in the form of separate plates. When mounted vertically, it is, to put it mildly, not very convenient, but I suppose you already know why.

But in general, the heater is pretty good. Here are its main advantages, which will undoubtedly please you:

  • relatively low price;
  • ease of installation;
  • the material is not so flammable, so, from the point of view of fire safety, it is what you need;
  • cotton wool is unsuitable for rodents and insects, and this is a rather urgent issue for residents of the private sector and rural areas.

By the way, when buying a material, be sure (!) Check with the sales assistant if the material requires special conditions, for example, the use of a vapor barrier (in any case, it will not be superfluous, but you never know what). And one more thing: on our website there is another article on the topic “Insulation of the ceiling in an apartment and a private house”, which also discusses the process of installing thermal insulation.

Well, okay, let’s move on. It would be unfair to limit ourselves to the merits of this material. Naturally, nothing is perfect, and this truth has not bypassed mineral wool either. Here are some of the disadvantages of this method of warming:

  1. when wet, cotton wool loses its properties. If we are talking about a few drops of water, then it’s okay, but if the cotton gets wet profusely, for example, when the roof leaks, then nothing good will happen. It will not only cease to be a heater, but will also become a favorable environment for the life of parasitic microorganisms, that is, mold. Although it is unsuitable for insects and rodents, raw mineral wool looks very appetizing for mold. Therefore, before starting work, be sure to check the roof for leaks and if you find a leak, then eliminate this flaw before starting work;
  2. cotton wool requires special handling. “Special handling” here refers to the observance of certain rules during transportation and storage. In no case should it be pressed, otherwise its useful properties, as a heater, will instantly decrease by 30-40%;
  3. people with asthma and other diseases of the respiratory system cannot (!) work with it. But if there is no other way out, but put on a respirator or, in extreme cases, a gauze bandage, you will be safer.

It cannot be said that the disadvantages listed above are a reason to abandon this method of insulation. In fact, this is a really reliable, affordable and versatile insulation. The main thing is to observe safety precautions and not violate the rules of operation.

Now about the thickness. Yes, thickness does affect thermal insulation. When insulating the ceiling from the side of the attic, it is important to take into account one point: the thickness of the wool should be from 30 cm.

If you use several types of insulation, then make sure that the bottom layer is the least vapor permeable. This means that it is impossible to lay polystyrene on our insulation, but vice versa is another matter. If there is a need for sound insulation, it is recommended to use a material with a density of 40 kg/m³.

And so we come to the climax of our work. Now it’s time to start the installation.

Stages of work

So let’s get to work:

  • Be sure (!) We check the boards for rot. Outwardly, they may look intact, but if you hear a dull sound when struck with a hammer, it is most likely rotten inside. It should be replaced with a new fragment treated with an antiseptic. In general, the preparation is the same as when using foam;
  • checking the roof. If it leaks at least a little, the mineral wool will not forgive you for this. Therefore, be sure to eliminate the leak;
  • checking communications. Although mineral wool is a hardly flammable material, it’s still worth it to play it safe;
  • clean the surface of debris;
  • we build a wooden frame;
  • laying vapor barrier material. Just in case, I will say that the vapor barrier cannot be laid on both sides. If you suddenly want to spread it on top – resist this pernicious desire. The condensate will have nowhere to evaporate, and then the mineral wool will begin to slowly but surely rush;
  • roll out the rolls between the beams (well, or lay the tiles);
  • we mount a wooden base;
  • enjoy the work done.

You can, of course, do without mounting a rigid base. But this is only if you are not going to go into the attic in the future and store all sorts of things on it. We remember that insulation cannot be pressed, right? And if you want to make a real attic floor out of your attic, that is, one more room.

But many residents of the private sector practice this very successfully. Just imagine how much usable space in your home will be unused if you don’t use the attic. Believe me, you can do almost anything there, you just need to connect your rich imagination, and then proceed to implement your design decisions.

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