One of the most popular materials for insulating roofs and mansards is polystyrene foam. It is used for almost all types of roofs from flat to three to four pitched. It is also often used to insulate floors on floors.
The popularity of this material is easy to explain because it has a lot of advantages:
However, the foam also has disadvantages to which we can attribute:
Fire safety measures must be strictly observed.
The structure of roof insulation using foam plastic has a multi-layer appearance, in which there is waterproofing from the side of the roof , and from sides of the room - vapor barrier. If moisture gets into the structure of the cake and improper moisture disposal, rotting of rafter beams and wooden structural elements is possible.
The sequence of roof insulation works has been enlarged:
In the case of using foam as insulation for floors, it is laid on the first sub-floor, covered with a vapor barrier material.
Next, a layer of waterproof plywood or just plywood is laid with subsequent waterproofing and a final floor on top.
When choosing foam, it is necessary to be guided by the fact to avoid a large number of joints, choosing the size of the slabs in such a way as to try to bring them together to a minimum.
The thickness of the foam plastic slabs must be taken at least 10 centimeters, but any density can be taken, however, it is necessary to understand with an increase in density its mechanical strength and thermal insulation properties grow.
For roofs covered with profiled iron and metal shingles, sound insulation must also be provided.
The sound of hitting drops on the roof during rain will be clearly audible in the house, because the foam has practically no sound insulation properties.
Soundproofing material is usually laid before finishing the walls, and the thickness of the soundproofing layer will depend on the material used.
Insulation of the roof with foam begins with the installation of a waterproofing layer.
There are a large number of waterproofing materials on the market, but they all have almost the same membrane structure and allow moisture to pass in one direction outward .
The waterproofing material is laid on the rafter structure without tension, its sagging is allowed. The material is laid along the roof along its entire length during installation.
Care must be taken to ensure that the waterproofing layer is laid outwards.
Subsequent strips of material are laid with an overlap of at least 10 centimeters. Next, a crate is made on the waterproofing material.
To create a ventilated gap between the lathing and the film, bars of 40-50 millimeters thick are nailed onto the rafters to which the lathing is attached. Next, the roof is made.
Styrofoam plates are laid between the rafters in the free space. When laying, they try to cut the foam so that there are as few gaps as possible. Cutting the foam is done with a sharp stationery knife and a metal ruler.
It is very important that there is no temperature drop inside the insulating layers, at which condensation occurs, which can lead to dampness and decay of rafter structures.
Fastening of polystyrene is carried out with the help of wooden slats or with the help of glue.
All voids and crevices are carefully foamed. In order to avoid the appearance of cold bridges, it is recommended to lay the foam in two layers with overlapping joints, the layers are glued together.
If soundproofing is required, soundproofing material is placed on the foam. Most often, soundproofing materials have a fibrous structure and tend to accumulate moisture.
Therefore, a layer of insulation with a sound-insulating layer must be insulated from the interior with vapor insulation with anti-condensation coating.
The vapor barrier material is laid along the entire length of the wall. Overlapping laying. after which all joints are glued with special tape.
Next, the walls are finished. To ensure ventilation, it is necessary to leave a gap between the vapor barrier and the outer skin; the gap, as a rule, is left 3-5 millimeters.
In the production of insulation of ceilings with foam, the laying technology is identical to the technology of roof insulation.It is important to remember that the bottom layer will be vapor barrier and the top will be waterproofing.
At the same time, the cracks are foamed, but the fixing of the foam is not necessary, it will be fixed with the finished floor.
Polyfoam is an inexpensive and easy-to-install material that provides the necessary thermal insulation.
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