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August 12, 2017 18:07

Roof insulation foam

roof insulation foam - this important phase of the construction of a residential building, and therefore fit to perform work must be carefully and conscientiously.


  • advantages of using foam
  • Disadvantages of Styrofoam as a heater
  • Required tools and materials
  • Insulation of roofing foam: phasing of works
    • Surface Preparation roof
    • Choice foam for insulation
    • process of warming flatroof insulation
    • mansard roof
  • Tips professionals

From the roof insulation will depend on the room temperature, humidity level and overall comfort people.Today's manufacturers offer a wide variety of materials for thermal insulation: polyurethane foam, expanded clay, rock wool, ecowool, basalt slab, Penoizol, etc. But the most practical and inexpensive is polystyrene..

advantages of using foam

Many homeowners are faced with the task as roof insulation.Because to make installation of insulating materials often have their own, you must clearly understand how to insulate the roof penoplastomi what is the feasibility of this material.Consider the main advantages of foamed polystyrene:

  • high resistance to temperature changes;
  • environmental safety;
  • no inclination to deformation;
  • ease of processing tools and ease of installation;
  • has the lowest coefficient of thermal conductivity, so that does not get hot in the summer;
  • permissible for use in high humidity conditions while maintaining the functional parameters;
  • minimum weight material allows even insulated bearing structures;
  • long service life;
  • prevents the growth of bacteria;
  • material is hypoallergenic.


Disadvantages of Styrofoam insulation like

Despite the impressive number of advantages of using polystyrene as the thermal insulation material, the raw material has some drawbacks.Depending on the degree of importance, it is necessary to decide whether it is possible to insulate the roof foam.Consider the negative aspects of such a thermal insulation material:

  • polystyrene has a sufficiently high sound-proofing qualities, but for insulation "noisy" metal roof it fits smaller than cotton sheets;
  • promotes the formation of moldy fungus;
  • due to the fact that the rigid foam layers are not always sweaty dock at roof insulation in the void space may remain between structures, which are formed of cold bridges and condensation accumulates;
  • poisonous gas released during ignition of the material.

Important! In order to eliminate the risk of mold and mildew, you need to take care of the quality of waterproofing while paving material.


Required tools and materials

Before starting work on the roof insulation foam sheets, you need to prepare the following:

  • waterproof film;
  • staple gun;
  • wooden slats;
  • vapor barrier membrane;
  • a sharp knife;
  • polystyrene;
  • scissors;
  • screws;
  • assembly foam.


Insulation of roofing foam: phasing of works

roof insulation will create a comfortable microclimate in a residential area, to protect the roof from heat loss and freezing in the cold season.Keep in mind that the end result depends entirely on the integrity and quality of each stage of work.Consider in greater detail.

Surface Preparation roof

roof insulation using expanded polystyrene can be produced by various methods, among which are such as:

  • investment in the crate;
  • flooring material;
  • gluing sheets (using front frost compositions, liquid nails or mastic);
  • mechanical fixation of the foam (by anchors, nails, umbrellas or wooden slats).


It should comply with certain rules on the preparation of the surface before starting work.Consider the sequence of actions:

  1. initially need to clean and thoroughly dry the surface on which is laid insulation material.
  2. Because any roof consists of an inner and outer part, you need to check the frame rafter and the roof itself for damage and make repairs.Beams that are rotten could be replaced with the new process and design of fire-fighting chemical composition.
  3. for anticipation education moldy fungus should be treated with the inner surface of the roof with a special compound or an antiseptic, which prevents the growth of microorganisms.Moreover, all metal parts must be covered with anti-corrosive liquid.
  4. roof insulation foam from the inside requires a scrupulous selection of insulation materials, their thickness and quality.If the width of the foam sheet is smaller than the distance between the rafters, it would entail the formation of cracks and cavities, which will accumulate condensation.
  5. sure to think over a vapor barrier and ventilation openings between the rafters and insulation material in order to avoid rotting of the roof frame.

Choice foam for insulation

Before you start work on the construction of roof insulation, it is necessary to know for sure whether the overlap can withstand the expected load of the material.For this reason, choosing the expanded polystyrene materials, follow the parameters of its density.So, for thermal insulation, you can use the following types of material:

  • polystyrene foam with a density of 15 kg / m3 - perfect for the insulation of ceilings and pitched roof and surfaces;
  • extruded foam - is used for finishing attics and flat roofs, which provides mechanical loads;
  • foam with a density of 25 kg / m3 - serves to insulate the walls.


process of flat roof insulation

Proper insulation of the roof structure includes:

  • gidrobarerny layer;
  • directly insulation;
  • vapor barrier layer;
  • interior trim.

Also in this structure, it is necessary to leave a small space for air space, which will be located between the roofing and waterproofing layer.This will prevent unwanted condensation concentration.


Procedure for roof insulation with polystyrene foam as follows:

  1. primary objective is to measure the distance between the rafters and the thickness of the wooden slats themselves.To carry out the work needed to within millimeters.
  2. Proceed to cutting heat-insulating layers: the width of each piece should be 1 cm longer than the distance between the rafter sections.Further there
  3. styling foam.The process must be carried out so that between the insulation there are no gaps.Otherwise it begins to accumulate in the cavity and the cold condensate is formed, which impairs the insulation of the roof.
  4. If you avoid cracks in paving the foam was not possible, carefully seal the cavity with foam.


  1. After installing styrofoam you can start laying the vapor barrier membrane, which should be secured with a staple gun to the wooden rafters.
  2. During laying isolating film must adhere to the rules -. To stack layers need to overlap, making the cover of 5-6 cm At the same edge of the film should be prokleivat foiled tape.This will ensure maximum thermal insulation protection against the penetration of cold.

mansard roof insulation

Quite often becomes an attic space attic.In particular, such a device claimed if the house has a gable roof.As a result of this arrangement of the room, the home owner gets a full area of ​​the building.In this process a mansard roof insulation foam is the best solution among all possible variants of insulation.


To insulate the mansard roof is necessary to work on the laying of EPS boards between rafter factions.In general, thermal insulation process is as follows:

  1. There obmerka and cutting foam slabs of the desired size sheets.
  2. material is then located between the rafters in such a way that they lay closely as possible in the allotted space.The foam must be secured with special glue or use self-tapping screws.
  3. In the wake behind it is necessary to pave the waterproofing film, fixing it by means of adhesive or a staple gun.
  4. also over foam optional homeowner may be laid ruberoidnyj layer or made of cement-sand screed with reinforcement.
  5. After that, you can proceed to finish the inside of the attic by mounting drywall or other finishing material.
  6. At the request of the owner of the surface decorated by any selected method.

Important! Where insulation docks with truss or roof, you need to make an additional sealing.For this purpose, fit the usual foam.


Tips professionals

Many homeowners prefer to perform work on the roof insulation yourself.However, they often allow the missteps that nullify the "no" effort.Consider some of the most common mistakes:

  1. The use of substandard materials, violation of the order and the technology works.
  2. Admission to the installation of the foam material, on which there are defects or mechanical damage to the sheets during installation.Such a casual attitude contributes to the formation of cavities in the insulating layer and cavities where the condensate collected and subsequently namoroz, mold and dampness.
  3. due to bad tightness may also be correctly matched the width of the layers of expanded polystyrene.
  4. Another mistake - the use of plastic film instead of the vapor barrier membrane, which significantly worsens thermal insulation parameters.

Detailed instructions for roof insulation foam on videopredstavlena in snippet: