Do-it-yourself insulation of a pitched roof from the inside. Materials for roof insulation from the inside. Insulation of the roof from the inside with polyurethane foam

In our article, we have selected a video about roof insulation from the inside in various ways and materials.

Various insulation schemes

The first video about two different roof insulation schemes. In order for the insulation to work efficiently, it is necessary to make its correct fastening. What is the most efficient heating system? The following video is about this:

Analyze and fix errors

After watching the following video, you will see the mistakes of workers who incorrectly made the thermal insulation of the roof of the house. The expert will explain the mistakes and give recommendations on the use of a particular thermal insulation material. Find out why it is not recommended to use mineral wool to insulate the roof of a house.

Thermal insulation material Ecotermix 600

The following video will show an alternative method of insulation by spraying Ecothermix 600, which has 100% adhesion.

Roll Isover

You will learn how to insulate the roof of a house with your own hands and choose a good insulation by watching the following video. We will talk about the heat-insulating material Izover in rolls.

Rules for the installation of thermal insulation

The last video of our article about the rules for installing the thermal insulation of pitched roofs. The specialist tells the basics of thermal physics and explains the processes of air flow. The basic rule for the installation of thermal insulation is the creation of a gap between the layers of vapor barrier and insulation.

When arranging a pitched roof structure, the roof is most often insulated from the inside. The installation of a flat roof primarily involves the use of an external heat-insulating layer, and the addition of an internal one, only if necessary.

Preparing for the installation of insulation

The key function of the roof of the house is the protection of building structures from external influences and the preservation of heat in the premises. High-quality insulation helps maintain a favorable microclimate in the house in any season and in any weather. A properly installed heat-insulating layer is designed for a long service life and does not affect the condition of building structures.

When choosing a heater, it is important to consider a number of characteristics, including:

• thermal conductivity;
• installation technology;
• durability.

The minimum thickness of the insulation layer is 25 mm. The optimal thickness of the heat insulator is from 100 mm. Specific indicators are recommended to be calculated individually, depending on the requirements for heat saving and the climatic features of the region.

Materials suitable for insulating the roof of a house from the inside include:

• mineral wool heat insulators in rolls and plates;
• polymeric plate materials;
• polymeric sprayed materials;
• natural environmentally friendly heaters (mats made of algae or straw, cork, ecowool, etc.)

If you plan to do the roof insulation from the inside with your own hands, it is recommended to resort to installation of roll or plate materials. This is the easiest and most affordable way to perform reliable thermal insulation. Spraying polyurethane foam or penoizol, laying ecowool require the involvement of specialists with specialized equipment.

Characteristics and cutting materials

Mineral wool materials include glass wool and stone (basalt) wool. It is a layered material resistant to temperature influences. Mineral wool is produced in various thicknesses and densities, this should be taken into account when choosing a heater based on its technical characteristics.

Mineral wool is an environmentally friendly material that does not burn, does not deform over time, is not damaged by microorganisms and rodents, and is a good sound insulator. The disadvantage of cotton wool is its ability to accumulate moisture. Even a relatively small increase in the moisture content of the material (up to 5%) reduces its thermal insulation properties by half. That is why, when installing such a heater, special attention is paid to its proper hydro and vapor barrier, ventilation of the roofing pie.

Polymer board materials (extruded polystyrene foam, polyurethane foam) are widely used due to their durability, resistance to moisture, ease of installation. Extruded polystyrene foam and rigid polyurethane foam have a closed cell structure and do not absorb moisture. This allows you to mount the roofing pie without the use of vapor barrier and ventilation gaps.

The disadvantages of polymeric thermal insulation materials include flammability. Such insulation can ignite and smolder, releasing harmful substances. In addition, a roofing pie made using polyurethane foam or expanded polystyrene boards does not "breathe", that is, to ensure normal microcirculation of air in the attic room, special attention will be required to be paid to the ventilation system.

The cutting of mineral wool boards is required to be carried out with an allowance of 10-15 mm in order to ensure a snug fit of the insulation to the rafter system. Polymer boards compress less well, so they should be cut to size.

Insulation of the roof of the house from the inside can be done using environmentally friendly heat insulators. Mats made of natural materials (straw, algae, hemp) are mounted in the same way as mineral wool slabs. Straw blocks are recommended to be treated with flame retardants, as the material burns well. Hemp mats contain boron salts, which improves the fire resistance of the material. Heat-insulating ladders made of algae do not burn, do not rot, the wooden elements of the roof that come into contact with them remain dry, which increases the life of the roof.

Insulation from the inside of a flat roof

A flat roof is made with external insulation, for which foam concrete, expanded clay, foamed glass, basalt wool slabs or extruded polystyrene foam are used. But during operation, it may turn out that the existing heat-insulating layer does not fully cope with its functions. In this case, it is necessary to add another layer of insulation from the inside.

In order to qualitatively insulate the roof of the house from the inside, it will be necessary to perform a wooden crate on the ceiling of the rooms located directly under the ceiling. This method has a significant drawback - the height of the ceiling decreases. The thickness of the bars selected for the crate must correspond to the thickness of the insulation. This parameter is best determined on the basis of professional heat engineering calculations.

Bars are stuffed along the perimeter of the room, then the ceiling surface is divided into cells (rectangles or squares) with the same bars. It is recommended to choose the width of the cells based on the width of the slab or roll material, taking into account allowances so that the blocks of soft insulation stand up. For rigid slabs, temporary fasteners should be provided, which are removed after filling the joints of polymer slabs with a wooden frame with mounting foam.

To prevent the insulation from absorbing moisture, a vapor barrier film is attached over the crate. It is important to glue the joints of the panels with high quality and ensure a snug fit of the vapor barrier around the perimeter of the structure. The film is attached to the crate with a construction stapler.

Principles of pitched roof insulation

The technology for insulating a pitched roof from the inside may vary depending on:

• on the type of plate material (soft or hard insulation);
• from the presence of a waterproofing layer under the finishing roofing.

As a waterproofing, a special membrane or roofing material can be laid under the crate. If waterproofing is available, you should proceed with the installation of thermal insulation material. Soft plates are cut with a small allowance and fit between the rafters. It is preliminary recommended to stretch the cord 3-4 cm from the waterproofing, securing it with studs to create a ventilation gap. Plates made of polymeric materials can be mounted close to the waterproofing by blowing out the joints with the rafters with construction foam.

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By insulating the roof from the inside with your own hands, you will achieve two important advantages. Firstly, you will be able to get rid of heat losses, which in houses with non-insulated roofs amount to 15%. Secondly, by insulating the attic space, you will get additional space that can be turned into a full-fledged living room.

Photo of roof insulation

In order to effectively insulate your roof from the inside of your home, you will need to use the right materials. They have special requirements that must be taken into account when choosing.

• Density. Thermal insulation properties are higher for those materials whose density is low. For roofing, it is recommended to choose an average density;
• Thermal conductivity. Try to use materials that have the lowest thermal conductivity. So the protective layer will practically not release such significant heat from under the roof;
• Water absorption. This is the property to absorb and retain moisture in the pores of the material. We do not need to accumulate moisture, therefore, when choosing heat-insulating glass wool or mineral wool, be sure to check whether it is hydrophobized;
• Resistant to low temperatures. Most roof insulation materials easily withstand temperatures as low as -50 degrees Celsius. This is quite enough for any region of our country. But specify how many cycles of freezing and thawing the material can withstand;
• Burn resistant. The material must not present a hazard in this component. It is possible to get rid of such a lack of some heat insulators due to special impregnation;
• Chemical resistance. The selected thermal insulation should not be destroyed or lose its properties under the influence of chemicals. But you must not allow contact with them either;
• Environmental friendliness. Since many equip the roof space under the roof into a residential attic, you need to use extremely safe, environmentally friendly materials based on natural or non-hazardous components.

Insulation materials used

Considering all the requirements for materials for roof insulation from the inside, the choice will be between several optimal options for heat-insulating roofing materials.

1. Mineral wool. This is the most popular way to insulate a roof from the inside. Choose basalt wool, be sure to ask in the store when buying mineral wool for a product safety certificate. Dimensions, thickness, geometry of products are selected in accordance with the parameters of the roof itself.
2. Glass wool. Not so long ago, glass wool was used very widely in matters of roof insulation. But now the emergence of safer, environmentally friendly materials has brought glass wool to the background. The thermal insulation properties are not bad, the efficiency is at a high level. But when insulating the roof with glass wool, be sure to follow safety measures, wear protective suits, gloves, goggles, protect the respiratory tract from glass dust. For allergy sufferers, such material is contraindicated.
3. Polymer heaters. These include plates made of foam or expanded polystyrene. For the price, a very attractive option for roof insulation, but in practice it has its drawbacks. For starters, polystyrene foam and polystyrene burn easily, emit copious amounts of smoke that is dangerous to the body. They should be chosen for roof insulation only in situations where there are no alternatives.
4. Expanded clay. If you have insulated the floor in the house, expanded clay will be familiar to you. It has excellent thermal insulation properties, but it is incredibly difficult to work with it when insulating the roof from the inside. Theoretically, it is possible to use it, but in practice, not all experienced craftsmen undertake such work.

Stages of roof insulation

Photo of insulation - mineral wool

Now you can begin to consider the main stages of work aimed at warming the roof from the inside. Beforehand, we advise you to watch the video instructions, to get acquainted with all the nuances of thermal insulation clearly, using the example of experienced craftsmen.

The process of internal insulation of the roof includes four main stages.

1. Roof waterproofing installation. It is best to lay the waterproofing layer at the stage of laying the roofing material on the roof surface. The material is mounted perpendicular to the rafters, observing a slight sag. The smooth side of the waterproofing should be facing up. Be sure to glue the strips of the waterproofing sheet with adhesive tape to prevent the formation of cracks and gaps. Then, on the rafter legs, it is required to fill the counter-rails with the help of bars, and lay a crate of boards on them. Laying of roofing material begins on top of the board. If the roofing has already been completed, the waterproofing layer will have to be mounted under the rafters using a stapler. All joints are carefully glued with adhesive tape.
2. Installation of thermal insulation material. Take thermal insulation mats of the required thickness, lay them between the rafters. Laying should be done in a spacer or using a rough binder. The lining is made from thin slats, fishing line, twine, which is fastened with nails on the rafters. Fill with mats of thermal insulation material all the space between the rafters. Excess elements are cut off with a sharp knife. If you want to achieve the most effective thermal insulation in order to equip the attic for living quarters, all layers of material are laid offset from the bottom seam.
3. Installing vapor barrier on the roof. Vapor barrier films have one smooth side, which must be laid in the direction of the insulation material. The rough side is responsible for the absorption of wet fumes, therefore it is directed into the room. Laying the vapor barrier film correctly is very important so that it can work effectively. Having mixed up the laying sides, condensation will soon begin to appear on the surface. The material is mounted with a stapler, the joints are connected with adhesive tape.
4. Installation of profiles or guide bars. They are necessary for the installation of cladding decorative materials and creating the necessary ventilation gap.

Foamed roof insulation

Today, roof insulation with the help of foamed insulation is gaining more and more popularity. A prime example is polyurethane foam.

The method of roof insulation in this way has several features:

• The roof does not need additional preparation from the inside;
• The roof sheathing must be solid, carefully treated with antiseptics;
• For spraying polyurethane foam on the roof, special installations are used. They supply pressurized carbon dioxide. On the video you can see how they function;
• The method of roof insulation with foam insulation requires the invitation of specialists. It is financially unprofitable to purchase an installation;
• A layer of foam is applied to the inner surface of the roof, reaching the required thickness of the insulation;
• When the foam dries, it forms a layer of waterproof, seamless material on the roof, which is characterized by low thermal conductivity;
• The only drawback of foam insulation insulation is vapor tightness. To eliminate it, you need to equip the attic with an exhaust system. But it is required only for the arrangement of a residential attic.

Insulating the roof from the inside is easy with your own hands. But before starting work, it is necessary to study the theory, choose the best option for insulation and follow the sequence of laying layers of thermal insulation.

For the winter period, you must definitely prepare in advance. Especially the owners of private houses. To do this, it is necessary not only to purchase a sufficient amount of firewood or coal, but also to take care of the general insulation of the house. And you need to pay attention to both the walls and the roof. After all, the insulation of the roof of a wooden house from the inside will provide an optimal microclimate in the living rooms, increasing the average temperature in each room by several degrees. In such a house it will be warm even in the most severe frosts. The thermal insulation of the roof, performed in accordance with all the rules, will reduce the cost of operating the house, increase its durability and make living conditions more comfortable.

Wooden house

What are the benefits of roof insulation?

The reason for the appearance of significant heat loss is natural air exchange and thermal radiation. As it heats up, the air rises. This causes the ceiling to warm up, which can be very cold if the roof is not well insulated. If there is no thermal insulation, a lot of heat will need to be given off. Moreover, this process will occur continuously.

Properly made roof insulation will not only maintain the temperature in the living room at the desired level, but also significantly increase the durability of the rafters and beams used in the construction of the roof structure.

This is achieved by eliminating the ingress of moisture into the attic, which inevitably leads to rotting of the wooden structure. As a result, the bearing capacity of beams and rafters is sharply reduced, and the roof has to be repaired every 3-4 years.

Insulation - mineral wool

The presence of an insulated roof will allow not only to retain heat in cold weather, but also save from overheating in the hot season. That is why it is quite comfortable in a wooden house when it is sweltering heat outside.

In addition, roof insulation quite often allows you to significantly expand useful residential assistance. After all, even a very cold room can be made warm in this way, and this must be used to improve your living conditions.

When is the best time to insulate the roof?

Roof insulation should be started only after the shrinkage of the new log house. As a rule, on average, this takes about six months. During this time, various defects may appear on the roof, among the most common in this case are all kinds of distortions, cracks. They must be removed before work begins. In this case, the insulation will be of high quality.

If we talk about seasonality, then it all depends on your personal preferences. Most often, the roof is insulated in the summer, and in the winter they check the quality of the work performed.

Which heater should be preferred?

Modern heaters are different:

• fire safety;
• excellent thermal insulation properties;
• low weight;
• environmental friendliness;
• ease of installation;
• versatility, which allows you to use the same material for insulation of different roofing systems;
• long service life.

Manufacturers offer a fairly large range. At the same time, delivery can be made in the form of mats, rolled material and in bulk. If desired, you can always choose the appropriate option for the price factor. In particular, you can insulate the roof using:

The choice of a specific material will depend on the type of insulated roof and those who have financial capabilities. If you decide to purchase a cotton material, it is better to choose one whose characteristics indicate that it is hydrophobic. This means that during the production process, the insulation was treated with a special compound that prevents moisture absorption.

It is also worth paying attention to the combustibility group. For expanded polystyrene, group G1 is preferred. This will not support combustion away from an open source of flame.

How is a pitched roof insulated?

A roof of this type is characterized by a fairly large area, which causes the possibility of large heat loss in the cold season. Especially if the house has an attic floor. Therefore, it is advisable to take care of the thermal insulation device at the stage of building a house. But if this has not been done or the efficiency of thermal insulation is not high enough, the work can be done in a residential building without resorting to large-scale dismantling of roof structures.

To do this, the presence and integrity of the waterproofing layer is checked, which is traditionally placed between the roof and rafters during the construction of the house. In case of its absence, you will have to purchase a special hydro-barrier film that is able to retain water, but at the same time allows steam to pass through. It is also necessary to ensure that the rafters are wrapped with a hydro-barrier film, attaching it with a stapler to the rafters with the correct side. In this case, the top layer will prevent the penetration of moisture, and the bottom layer will not prevent the removal of steam and moisture.

Now you can start laying the insulation. Preference should be given to rolled material and material supplied in the form of plates. Lay it between the rafters, applying a little effort and avoiding the formation of gaps. However, it is imperative that between the insulation and the roofing material there must be a small layer for air circulation - blowing. It is she who will prevent a strong warming up of the attic in the summer. Plates can be fixed using:

• ordinary nylon cord;
• rails stuffed perpendicular to the rafters.

After laying the insulation, you can proceed to the vapor barrier device. To do this, you need to purchase a special vapor barrier film, which will need to be laid on top of the thermal insulation, attaching it to the rafters. As a result, the optimal humidity regime will be provided for the heat insulator, which guarantees its long service life. If necessary, you can perform finishing work if the attic is adapted for living.

How is a flat roof insulated?

Insulation of a flat roof can be performed not only from the inside, but also from the outside. In this case, the latter option, as a rule, is enough to create an optimal microclimate in the house.

The sequence of work in this case is as follows:

• a vapor-tight film is laid;
• insulation is laid or poured;
• it is laid and glued with a resin-based mastic, a roll coating based on synthetic materials or roofing material. This layer allows you to provide protection against moisture penetration;
• bulk material is placed.

Who will do the work?

If there is no desire to carry out roof insulation in a wooden house on your own, you can invite a team of experienced builders who have been working in this industry for a long time. They will be able to perform the necessary complex of works in the shortest possible time, ensuring high quality performance.

If the budget is limited, then choosing between buying high-quality modern materials and self-insulating the roof is better to choose the first option. Maybe in this case it will take a little more time, but the materials to be laid will have unique properties that allow them to keep warm in a wooden house for a long time. In addition, the progress of work can be monitored continuously.