Build Daily


August 12, 2017 18:06

Foam insulated roof step by step procedure

roof insulation foam - one of the most popular ways of home insulation, used for both pitched and flat roof.In addition, the foam can insulate the ceiling of the attic floor.Foam insulation has a lot of advantages: it is easy to installation and handling, not afraid of water, does not rot and is destroyed by the action of microorganisms, provides good insulation without weighing structure.

Foam for thermal insulation of roofs

foam for thermal insulation of the roof

have foam and disadvantages.These include vapor permeability and flammability.Therefore, when the roof insulation foam is necessary to take care of the ventilation of the attic space and to comply with all fire regulations.

Principles of roof insulation foam

As is the case with mineral wool insulation, roof insulation with foam insulating layer has the form of a multi-layer "cake", which are always present waterproofing film from the vapor barrier and the roof - the part of the attic space.Although foam and does not have the ability to accumulate moisture, water penetration and water vapor into the insulation layer is extremely undesirable - are beginning to rot truss beams and other wooden structural elements.

In general, the sequence of roof insulation foam is as follows: laying of waterproofing material to the rafters before or during the laying of roofing, fastening plates of foam between the rafters or under them, sealing the seams with foam and the exclusion of cold bridges, laying a vapor barrier, finishing interior wallsand ceiling of the attic.

The structure of the inside of the roof

roof structure inside

Also insulation of the roof itself, and the foam used for thermal insulation of floors, ie the floor of the attic.In this case, it is laid on a rough floor previously laid on the vapor barrier film layer, and top coated with a layer of plywood, waterproofing and decorative coating.When purchasing

foam plate should be selected of such size that the number of joints is minimized.The thickness of the foam for insulation must be at least 10 cm, the density can take any, it should be taken into account that with increasing density increases its mechanical strength and insulating properties.Sound insulation properties of the foam has almost no so-residential attic should be provided as a layer of insulation not less than 5 cm, placing it under the decorative trim.This is especially true for roofs covered with profiled sheet or metal tile - with the sound of rain drops can be heard quite clearly.

Besides the foam can also be used polystyrene plates.They have the same advantages as the foam, thus have greater strength, do not support combustion, resistant to damage by rodents.Price polystyrene slightly higher, but because of better thermal insulating properties can be taken at the plate thickness.

technology roof insulation foam

  1. roof insulation foam can be made both with an applied roofing, as well as at the opening of the roof.In both cases, begin with laying thermal insulation performance of waterproofing film.The film is best to choose a special example, Izospan for roofing.It has a membrane structure and releases water vapor in one direction - inside the thermal insulation "cake" outside.The film was placed on the rafters, not pulling it.It allowed the film sagging.The roll is unwound across the rafters to the entire length of the roof, thus it is necessary to make sure that the film has turned out smooth vodoparonepronitsaemym layer.The following film strip is laid overlapping at least 10 cm, and a special tape glued joints.Between the film and crate must be an air gap, so on top of the rafters film nail bar 50 mm, and on top of it - batten boards, which are stacked and roofing.

    Laying the waterproofing layer

    Placement waterproofing layer

  2. foam slabs laid usually in the space between the rafters, taking care not to leave gaps.The plate size is cut by a clerical or other thin sharp knife on a metal ruler.Mounting foam to the rafters can be done with the help of auxiliary rails or glue for polystyrene.If the rafters are made of beams or boards, foam can be glued to the plane of the rafters glue.If the rafters have a circular cross section, fastening adhesive can be insufficient.In this case, the filing of the board adheres to the plate in two or three places, and the void between the plates and other structural elements zapenivayut.

    Laying slabs of foam between the rafters

    laying slabs of foam between the rafters

  3. It is important to thoroughly repaired all the cracks to avoid the formation of cold bridges.Variations in temperature inside the heat-insulating "cake" led to the fact that in places subject to cooling, condensation, resulting in leakage or can be formed to begin rotting roof system.In order to avoid thermal bridges foam can be laid in two layers vrazbezhku, covering the second layer of the first joints.Between the layers are bonded to the adhesive.

    The final phase of the installation of foam between the rafters

    final stage of installation of the foam between the rafters

  4. If necessary sound insulation of the attic room, put on top of the foam sound insulation mats of fibrous materials.Fibrous materials when wet lose their properties, so they need to close vapor barrier.
  5. Insulation necessarily isolated from the internal space of the attic vapor barrier anti-condensate film.It is laid overlapping, carefully prokleivaya joints and is secured with the help of furniture or a staple gun to rafters or binder.

    Waterproofing insulation foam anti-condensate film

    Waterproofing insulation foam anti-condensate film

  6. for fixing cladding should be sent - wooden blocks or profile.Their thickness should provide a ventilation gap of 3-5 mm between the insulation and cladding.As the skin is better to use natural materials, not prone to condensation.In addition, when the roof insulation foam must always be equipped with exhaust ventilation and adjustable heating system that in wet weather to avoid waterlogged walls of the attic.

When insulation foam insulation slabs technology is similar to the roof.It should be remembered that the lower layer separating the layer of insulation and draft floor, have to be a vapor barrier film with anti-condensation properties, and the top, which keeps the floor finish - waterproofing film.It will protect the insulation from waterlogging in the case of water leaks.Styrofoam plates while placed in the gaps between the ceiling beams, zapenivaya gap.By foam beams can not strengthen, it will be pressed against the floor finishing.

Insulation foam slabs and floor

foam insulation of floors and floor

foam does not have a high resistance to point loads, so when used as a coating of linoleum, cork or a thin foam laminates must be closed water-resistant plywood or plasterboard.On top of the foam can also be made concrete screed, which put water underfloor heating - this will ensure uniform heating of the attic space and adjust the humidity, thereby maintaining optimum microclimate there.