Wet insulation under vapor barrier what to do. What to do with wet (mineral wool) mineral wool Wet insulation on the roof what to do

Mineral wool is used for and inside, the characteristics of which make your home warmer and more comfortable. Mineral wool is a heat-insulating material that will help heat your home in the winter, that is, keep the heat from the heaters in the room and halve the costs during the heating season.

You will also have the opportunity to insulate the walls of your house with your own hands, following the installation rules. As a rule, the walls of houses are insulated with external thermal insulation, and not internal.

The main reason for this decision is to save internal space, and you can also protect load-bearing structures from atmospheric influence.

If you have a solution to insulate the inside of the house, then it is worth considering the fact that you will also have to install a vapor barrier layer, and this will interfere with the natural ventilation of the rooms.

And if the house is insulated from the outside, you will have the opportunity to reconstruct the facade and change your house. It seems that warming a country house or mansion is a laborious process that only masters can do, but this is not so, it will be easy to do this work on your own, even if you had no experience in this.

Types of mineral wool

If you need, then you need to buy facade wool, since for external and internal mineral wool insulation, its characteristics are different.

One of the main features of facade wool is its moisture resistance, that is, it has a high degree of hydrophobicity.

The density level of facade mineral wool is very high and the ability to repel moisture distinguishes it from a number of similar heaters.

Types of mineral wool:

• fiberglass;
• basalt;
• stone.

Also a big advantage of mineral wool is fire resistance. Manufacturers produce insulation in the form of mats or slabs of various thicknesses: 5, 10 or 15 cm.

Preparing walls for insulation

If you think that mineral wool, the characteristics of which are suitable for your home, is a good insulation, then you must first prepare the walls for decoration. If the walls have plaster, it must be stripped down to brick, wood, concrete or stone, depending on what the walls of the house are made of.

If there are level differences on the walls of more than two centimeters, then they need to be eliminated. After cleaning the walls from dust and dirt, you can cover the prepared walls with a primer.

You will need two types of mineral wool, which will differ in density. A soft slab is laid against the wall, since such cotton wool can fill all the irregularities of the wall. Lay a hard slab on a soft one, so you form a flat surface of the walls from the outside. The total width of the insulation should not be more than 10 centimeters.

Insulation work begins from the bottom, the plates are glued with a special glue.

When insulating a wall, you will have to adhere to the following sequence: wall, insulation, reinforcing mesh on dowels and facade plaster.

You can also insulate the house by making a ventilated facade. This will help prevent the formation of wet condensate, which harms the mineral wool. Even despite their high moisture resistance, they pass water vapor through their thickness, which can ruin both mineral wool, deforming and exfoliating it, and the walls of the house.

Disadvantages of mineral wool

As a rule, the characteristics of mineral wool have more positive qualities than disadvantages, but you still need to take into account all the disadvantages of this insulation. One of the main drawbacks of the insulation is the loss of its heat-insulating qualities by the mineral wool in case of getting wet.

If it suddenly happened that, for example, a water pipe burst and the mineral wool got wet, it must be dried thoroughly. When insulating the house from the outside, take care of protecting the mineral wool. You can use insulation under the siding, this will not only protect it from moisture, but also make your facade beautiful.

Stone wool fibers are not spiky, but still small pieces can rise up like dust. There is a danger, since these pieces can be inhaled, and this is very dangerous for health. Mineral wool also contains formaldehyde resin, which can poison you with phenol.

If you follow safety precautions and work in a respirator, then you are not afraid of any dangers.

Phenol at room temperature will not stand out if you have purchased good quality mineral wool, but it is better to cover the surface of the insulation with a vapor-proof PVC film.

Heating mineral wool above room temperature will release phenol and may affect your health. If you do not have the opportunity to prevent strong heating of mineral wool, then buy basalt wool, which is of better quality, however, will cost more. safe for health.

Arkady Shchelyunin, Astrakhan. Question: Good afternoon, it's raining, autumn. They did not have time to make cotton wool on the facade of the claydite-concrete house. How to be now? It rains every day. We are afraid that cotton wool will get wet. Then winter. How to dry it?

Sergey Zaitsev, Moscow, specialist.

Answer: Good afternoon, Arkady. In response to your question, I can advise you the following. First, you are right. If it falls under heavy and prolonged rain, then it will absorb moisture. Despite all the advertising assurances of the manufacturers, in the photo with beautiful drops of water on the cotton wool, however, the basalt insulation absorbs moisture and very well.

Therefore, it is impossible to wet it in heavy rain. If during the installation process the cotton wool on the walls gets wet with rain - it's not scary. But if you keep it in the rain for a day, then you really won’t be able to dry it before installation.

So we do 3 things.

Protecting wool from rain before installation

We store the finished cotton wool in bales right next to the walls, preferably indoors. In this case, you can apply for mounting on the walls in the windows of the first or second floor, as it is more convenient.

Further, if the wall is deaf, we make a temporary canopy of boards and film next to it. Nothing global is needed, the main thing is that the water flows to the ground, and not to cotton wool. Although it is packed in film bales, it is not protection from heavy rain.

Further, we understand that in heavy rain, especially during a protracted autumn storm, all the water is underfoot, the earth does not have time to absorb such an amount of water. We do not put cotton wool in bales and sheets on the ground, even under a canopy. It is best to use the most ordinary wooden pallets. Their height, 15 cm, is enough so that the cotton wool does not get wet from the ground.

Wool protection during installation

To prevent the basalt insulation from getting wet during installation, it is worth protecting the installation site from rain. For this purpose, it is very convenient to use inventory scaffolding. And on these scaffolding, lay boards along the upper rungs of the upper row and stretch the film.

Get cheap and cheerful. Not only building materials will be dry, but also the installers themselves, who work on the walls.

To drain rainwater from film roofs on scaffolding, the easiest way is to use 3-4 drain pipes with a diameter of 110 mm, into which water accumulating on the film will merge. This will allow you not to get wet under an unexpected “waterfall”, when water that does not have a drain bends the film and rushes down in an “unfortunate” place.

Protection of basalt insulation after installation

And, of course, immediately after installing a section of basalt insulation on the wall, this section is closed. This protects the already installed wool on the walls from slanting rain.

The membrane itself does not tolerate ultraviolet light very well, so you should not hesitate with the subsequent decorative coating - siding or some other that you have chosen.

If you are not doing a ventilation facade, but, then you should not particularly worry here. The plaster layer will calmly close the cotton wool, anyway it will get a little wet during the installation process.

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Rock wool getting wet in the attic can be at least due to several reasons. Due to leakage or damage to the roof, improperly positioned vapor barrier, lack of ventilation or errors in its execution. Regardless of the cause, the result is the same. The mineral wool is wet. Is this wool still fulfilling its role? How to dry it?

Mineral wool, first of all, isolates. Protects from cold in winter, protects from heat in summer. Increases fire resistance, provides sound insulation, thanks to it the house becomes quieter. When choosing mineral wool, it is worth putting on products with increased hydrophobization. These are materials from which moisture evaporates very quickly.

The fact that mineral wool is wet can be indicated by higher heating bills, increased humidity in the rooms, in the attic, smudges appearing on the eaves or in the attic, and mold on roof structural elements.

You have to remember that you can't install wet mineral wool. If it happens that the cotton wool gets wet during transport or storage, it should first be unrolled and dried thoroughly. Only after it dries, you can proceed with its installation.

Remove, dry, install

It is worse when the mineral wool, which is already installed in the attic, gets wet. Then it needs to be dismantled, dried and installed again. This is very important because wet meneral wool loses its properties. The drier it is, the better its parameters. Water that penetrates the cotton reduces its effectiveness. Even a small amount of water can significantly reduce its parameters. Wet mineral wool does not fulfill its task. Instead of insulating, it conducts heat. If there is wet mineral wool in the roof, thermal insulation is reduced and heating bills are increased. Wet insulation also has a negative effect on wooden structures, helps to moisten the rafters, and, as you know, dampness is the main enemy of wood.

Do not do without dismantling!

If the cotton wool installed in the roof gets wet, you can't rely on it to dry completely while remaining in place. And even if this happens, it can last a very long time, if putrefactive processes do not begin to occur in it earlier, or it does not become moldy. Therefore, wet mineral wool must be dismantled, thoroughly dried and reinstalled. This is the correct, albeit the most time-consuming way.

Ventilation without errors

One of the more common causes of damp mineral wool is roof ventilation problems. Good ventilation allows air to circulate above the insulation, which allows condensation to systematically evaporate from it. Therefore, it is so important to carefully manufacture roof ventilation.

Question:

Hello. I got wet on the roof of the heat-insulating material -. The firm's builders say it's rock-hard and it dries out quickly. Is it true? What are the consequences of getting Rockwool, a thermal insulation material, wet?

Konstantin

Answer:

Hello Konstantin.

The insulation material could get wet for the following reasons:

1. Roof leak.

2. The integrity of the vapor barrier layer has been broken.

It is true that mineral wool can dry out after wetting, but certain conditions must be observed. It is necessary to make sure that the air can move freely in the under-roof space. It is thanks to this that moisture will be removed from the insulation material. To achieve this, you need to make a ventilation gap, which can be either single or double, it all depends on the type of construction.

Based on our experience in thermal insulation, we can state that a properly installed and well-ventilated under-roof space will help to dry the wet insulation and the already dried material will not lose its thermal performance.

You need to find out why it got wet and eliminate the cause. If everything is clear with a leak, then most of the cases of wetting of the thermal insulation material is the absence of a vapor barrier or sheathing when installing thermal insulation. A common mistake is poor gluing of the seams with double-sided tape or not gluing the overlaps at all. When laying vapor barrier films, it is necessary to glue all 10-centimeter overlaps with double-sided tape.

Do not forget to inspect the truss system, what happened to it when wet. Wooden structures also dry out, but not as quickly as mineral wool insulation. To ensure the best safety of the rafter system, all wood parts must be treated with an antiseptic, it will help the tree not absorb water so quickly.

Mansard roof insulation - three benefits in one solution. First, the house becomes noticeably warmer. Secondly, heating costs are reduced by 30-50%. Well, and the third: there is a residential floor. They finished the walls - and instead of a cluttered attic, they got cozy rooms under the roof.

A popular roofing insulation is mineral wool. Material with excellent performance, non-flammable and affordable.

Why does mineral wool get wet

The thermal conductivity coefficient of mineral fibers is 0.031-0.042 W / m 2 * K. This means that a layer of glass wool 5 cm thick is equal to the thermal effect of a meter-long brick wall. But the thermal insulation properties disappear when moisture penetrates the fibers.

Reasons for getting wet:

1. The waterproofing membrane was damaged when laying the insulation. They pulled the canvas too tight, accidentally pierced it with a nail or self-tapping screw.
2. The joints of the film were not glued. As a result, condensate penetrates into the mineral wool fibers.
3. Insufficiently tightly fixed waterproofing near the ventilation and chimneys.
4. A poor quality diffuse membrane was used.

The risk of getting wet: what threatens raw insulation

Wait to get wet roof insulation dry on its own - a dangerous delusion. Wet mineral wool does not retain heat. In addition, it becomes a source of unpleasant odor, the spread of mold and bacteria. Well, the "cherry" in the troubles of the roofing pie: the wooden rafters are destroyed, the metal elements of the structure are rusting at an accelerated pace. The result is a major overhaul of the roof.

To avoid problems, check the condition of the insulation:

• if there are streaks or drops on the walls of the attic;
• cracks appeared on the roof, roofing elements do not fit tightly;
• in places where snow accumulated, the roof caved in.

Wet business: what to do with wet insulation

Having discovered that the thermal insulation is wet, there are two options for the development of events. If the fibers are wet only at the top and in a small area, it is possible to dry this place. This requires two conditions: a draft and clear, warm weather.

Wet through insulation URSA experts recommend replacing. The main thing is not to make previous mistakes when installing new material.

How to fix the problem and leave the thermal insulation dry

To protect your newly insulated roof from getting wet, consider these professional tips:

• it is desirable to carry out installation in dry weather;
• before installing the mineral wool, cut the waterproofing film into layers of the desired length;
• after fixing the insulation, immediately cover it with a protective membrane;
• glue the joints of the film, fix it on the rafters with a construction stapler;
• walk only on the boardwalk so as not to tear the waterproofing.

You can select a special insulation material for pitched roofs and waterproofing for it at http://www.ursa.ru/construction-solutions/skatnie-krishi/.

Proven materials, competent installation and the roof will remain dry in any weather!