Roof insulation with foam plastic

Roof insulation with foam - is an important stage in the construction of a residential building, and therefore it is necessary to approach accurately and conscientiously.

From roof thermal insulation will dependtemperature in rooms, humidity level and overall comfort of a person's living. Modern manufacturers offer a wide variety of materials for insulation: polyurethane foam, expanded clay, mineral wool, ecowool, basalt slabs, penoizol, etc. But the most practical and inexpensive is polystyrene foam.

Advantages of using

foam Many homeowners faced the same challenge as roof insulation. Since it is often necessary to build insulating materials independently, it is necessary to clearly understand how to insulate the roof with foam plastic materials in what sense the use of this material. Consider the main advantages of expanded polystyrene:

• high resistance to temperature changes;
• environmental safety;
• no tendency to deformation;
• simplicity in tool handling and ease of installation;
• has a low coefficient of thermal conductivity, which does not heat up during the summer;
• is permissible for use in high humidity conditions while maintaining functional parameters;
• the minimum weight of material allows to insulate even load-bearing structures;
• long service life;
• inhibits the growth of bacteria;
• material is hypoallergenic.

Deficiencies of expanded polystyrene as insulation

Despite the impressive number of advantages of using expanded polystyrene as thermal insulation material, this type of raw material has some drawbacks. Depending on the degree of their importance, it is necessary to decide whether it is possible to insulate the roof with polystyrene foam. Consider the negative side of the thermal insulation with this material:

• polystyrene foam has sufficiently high soundproofing qualities, however, for insulation of "noisy" metal roofs, it fits less than cotton sheets;
• promotes the formation of moldy fungus;
• due to the fact that rigid layers of polystyrene foam do not always dewble together when the roof is insulated, in the space between the structures there may be voids in which cold bridges are formed and condensate accumulates;
• in the event of a fire, a toxic gas is released.

Important! In order to eliminate the risk of mold and fungus, it is necessary to take care of quality waterproofing during the laying of the material.

Required tools and materials

Before you begin work on the thermal insulation of the roof foam sheets, you must prepare the following:

• waterproofing film;
• construction stapler;
• wooden slats;
• vapor barrier membrane;
• sharp knife;
• expanded polystyrene;
• scissors;
• self-tapping screws;
• mounting foam.

Roof insulation with foam plastic: step-by-step works

Roof thermal insulation will create a comfortable microclimate in the residential space, protect the roof from heat loss and freezing during the cold season. Remember that the final result depends entirely on the conscientiousness and quality of each stage of the work. Let us consider them in more detail.

Preparation of the roof surface

The thermal insulation of the roof with the use of expanded polystyrene can be made by various methods, among which are distinguished such as:

• enclosure in the crate;
• material flooring;
• gluing sheets( with the help of facade frost-resistant compounds, liquid nails or mastics);
• mechanical fixation of foam( by means of anchors, nails, umbrellas or wooden racks).

Some surface preparation rules must be followed before starting work. Consider the sequence of actions:

1. Initially, it is necessary to clean and thoroughly dry the surface on which the thermal insulation material will be laid.
2. As any roof consists of the inner and outer parts, it is necessary to check the rafter frame and the roof itself for damage and repair work. The beams, which could have been rotten, should be replaced with new ones and treated with fireproof chemical composition.
3. To prevent the formation of a moldy fungus, the inner surface of the roof should be treated with a special compound or antiseptic that prevents the growth of microorganisms. In this case, all metal parts must be covered with an anti-corrosion fluid.
4. Thermal insulation of the roof with foam plastic from the inside requires a scrupulous selection of insulation materials, their thickness and quality. If the width of the foam sheets is less than the distance between the rafters, this will entail the formation of cracks and a cavity where condensate will accumulate.
5. Be sure to consider the vapor barrier and ventilation holes between the rafters and insulating material to avoid rotting the roof frame.

Selecting foam for insulation of

Before you begin to work on the thermal insulation of the roof structure, you need to know for sure whether the floor can withstand the expected load of the material. For this reason, when choosing foam polystyrene raw materials, follow the parameters of its density. So, for thermal insulation, the following types of material can be used:

• polystyrene foam with a density of 15 kg / m3 - perfect for insulation of ceilings, as well as pitched and mansard surfaces;
• extruded polystyrene - used for finishing attic spaces and gently sloping roofs, where mechanical loads are provided;
• polystyrene foam with a density of 25 kg / m3 - serves to warm the walls.

The process of thermal insulation of a flat roof

The correct design of a roof thermal insulation includes:

• a hydrobaryar layer;
• directly insulated;
• vapor barrier layer;
• interior finish.

Also in this design, it is necessary to leave small cavities for airspace that will be located between the roof and the waterproofing layer. This will avoid undesirable concentration of condensate.

The sequence of actions for the insulation of the roof with expanded polystyrene is as follows:

1. The primary task is to measure the distance between the rafters, as well as the thickness of the wooden rails themselves. Perform the work to the accuracy of millimeters.
2. Proceed to cutting heat insulation layers: the width of each fragment should be 1 cm larger than the distance between the rafter sections.
3. Next, the foam is laid. The process must be done so that there are no gaps between the heater. Otherwise, the cold will accumulate in the cavity and condensation will form, which worsens the thermal insulation of the roof.
4. If you avoid cracks when laying foam, failed, carefully seal the cavity mounting foam.

1. After installation of expanded polystyrene, you can begin laying the vapor barrier membrane, which should be secured with a construction stapler to the wooden rafters.
2. In the process of laying the vapor barrier film, it is necessary to adhere to the rule - lay layers to overlap, making an overlap of 5-6 cm. At the same time, the edges of the film need to be glued with foil tape. This will ensure the thermal insulation of the maximum protection against the penetration of cold.

Thermal insulation of the roof roof

Quite often the attic space becomes a residential attic. In particular, this method is in demand if the house has a gable roof. As a result of the arrangement of this premise, the owner of the dwelling receives a full area of ​​the building. At the same time, the process of warming the mansard roof with foam plastic is the most optimal solution among all possible options for thermal insulation.

To insulate the attic roof, it is necessary to conduct work on laying foam polystyrene plates between the rafters. In general, the process of thermal insulation is as follows:

1. There is a measurement and slicing of foam plates on sheets of the required size.
2. The material is then placed between the rafters in such a way that they lie as tightly as possible in the space provided. Foam plastic must be fixed with a special glue or use self-tapping screws.
3. In the wake of this, it is necessary to lay a waterproofing film, fixing it by means of an adhesive compound or a construction stapler.
4. Also on top of the foam plastic, at the request of the house owner, a roofing layer can be laid or a cement-sand screed with reinforcement can be made.
5. After this, you can begin to trim the inner side of the attic by installing plasterboard or other finishing material.
6. At the request of the owner, the surface is decorated with any chosen method.

Important! In places where the heater is docked with a rafter or roof, additional sealing is necessary. For this purpose, the usual mounting foam is suitable.

Advice from

professionals Many homeowners prefer to do roof insulation work on their own. However, they often allow oversights, which reduce to "no" all efforts. Consider some of the most common mistakes:

1. Use of poor-quality materials, violation of order and technology work.
2. Assumption for the installation of foam material, on which there are defects or mechanical damage to the sheets during laying. Such a careless attitude contributes to the formation of cavities and cavities in the heat-insulating layer, where condensate is collected, and subsequently frost, mold and dampness.
3. The reason for the poor sealing may also be the improperly chosen width of the expanded polystyrene beds.
4. Another mistake is the use of a polyethylene film instead of a vapor barrier membrane, which significantly degrades the thermal insulation parameters.

Detailed instructions for the insulation of the roof with polystyrene on video is presented in the fragment :