Almost every person who builds a house should know what a ventilated roof is?
It consists of three main ventilation circuits:
- ventilation of the space, which is located between the waterproofing layer and the coating, and also covers almost all planes, despite the degree of complexity of the roofs;
- ventilation of the space directly under the roof, which is considered one of the elements of the ventilation system of the house;
- ventilation of the space located between the waterproofing layer and the insulation, in which stagnant zones are absolutely excluded.
Design and installation of ventilation
For many decades, with the imperfection of technologies and building materials, houses were built that breathed due to brick, wood, window crevices, in doors, masonry, in the crevices between layers of rolled materials - roofing material, glassine, in which all three ventilation circuits were rallied.
As a result of these technologies, the house had constant drafts, increased heating costs, and some restrictions on interior decoration. Quite often, dampness and fungus appeared in some places. Ventilation ducts in the houses were arranged only in the kitchens and bathrooms.
This issue could be solved at a high level by modern building materials for the roof.
Your attention! When designing your home, you should pay special attention to the ventilation system.
For those who want to independently conduct an examination of the project, there are two basic rules for a heat roofer:
- Steam always rises
- Water always flows down.
The implications of these rules are:
When installing a vapor barrier, there are few overlaps of roofing materials on each other, on load-bearing elements and walls of the structure, the joints are glued with a special tape;
When there is no ventilation inside the room, sometimes even gluing cannot prevent the penetration of moisture into the insulation if the vapor pressure is high. Ventilation allows you to "let steam out of the boiler."
The walls of the house should not "breathe", since the moisture that lingers in the outer layers of the walls often leads to delamination when it freezes and it easily penetrates the "roofing cake" through the walls.
Tip! You should pay attention to the ventilation of small rooms and spaces.
Installation of vapor barrier should be carried out closer to the interior of the house.
If errors occur during the installation of waterproofing, then it is necessary to dismantle the roofing, correct the errors, and provide access from inside the house to the vapor barrier.
Roof device
Roof ventilation prevents the formation of an ice crust on the ridge and roof ledges.
The influx of fresh air provides a ventilated space, and in the summer, when the roof heats up, the air takes moisture and brings it out. In order for such a system to work well, it is necessary to correctly think over the crate on which the ventilated roof is applied.
In the case when a truss system has already been installed, then it is worth thinking about choosing a roof. If you build spaces such as a garage or warehouse that are not heated, then the ventilation will be natural and the life of that building will be limited by the life of the selected materials.
In order for the building to serve for a long time, it is necessary to arrange forced ventilation and insulate the room.
An uninsulated roof consists of the following elements:
- rafters;
- crates;
- roofing material;
- waterproofing films.
The waterproofing film is fixed to the rafters with the help of rails. Even when the roofing is worn, it prevents moisture from getting inside the building and has a long service life.
Such material will be indispensable, even if you build a small country house covered with slate, this film will last more than 50 years.
In private houses, a device of a special "roofing cake».
In addition to insulation for ventilation, a diffusion waterproofing film is applied. This film does not allow moisture to pass into the under-roof structures and ensures the passage of steam through the smallest pores of the material.
And also it reliably protects the structure from the wind, having excellent waterproofing properties.
Only when installing gaps between the heat-insulating structure, the roof and the film - good ventilation is ensured by the use of a diffusion film for waterproofing. Otherwise, it will not let water vapor through.
You can use an anti-condensation film for waterproofing.
It will well prevent the formation of condensate and is used for ventilated roofing when using any roofing.
The structure of this material consists of 4 layers:
- polypropylene fabric resistant to ultraviolet;
- non-woven moisture-absorbing material;
- laminated film - 2 layers.
The anti-condensation film protects not only from the penetration of moisture into the room, but also from the accumulation of dust, the formation of soot.
In a ventilated roof, vents are left to achieve a good effect, and holes and ventilated ridges are also equipped in the lower part of the cornice, which connects the ventilated gaps of the roof well with the atmosphere.
The device of a ventilated roof consists of a finishing material and a roof insulation. The steam that leaves the room reaches the insulation, which, absorbing moisture, loses its thermal insulation qualities.
The moisture that has accumulated in the heat-insulating layer mainly penetrates back into the room and appears as drops on the ceiling and walls.
In the summer roofing heats up very quickly and the heat gets through the roof structure into the room. To avoid this, for this, a ventilated roof is installed.
To date, the requirements for modern roofing materials are very stringent.They must protect the room from the penetration of moisture into the layer. roof insulation, and if this happened, then contribute to the rapid removal of moisture.
Therefore, a ventilated roof must be well insulated.
Did the article help you?