How to choose a vapor barrier for the roof
Vapor barrier solves the important task of ensuring normal humidity and air temperature. In addition, its competent organization protects the roof structure, keeping all its elements completely dry.
Vapor barrier materials prevent the movement of steam, which makes it possible to ensure optimum moisture characteristics of roofing materials, or rather protection of thermal insulation (for example, mineral wool) from the effects of water vapor that penetrate from the interior. To achieve success, it does not hurt to have information on how to choose a vapor barrier for the roof and what to focus on when buying it.
Important aspects of choice
- When choosing materials vapor barrier particularly note a number of parameters that will help prevent excessive moisture from the roof, provide ventilation and protection from precipitation.
- Паропроницаемость, показатель характеризующий скорость выравнивания давления пара между средами, которые разделяет паронепронецаемая мембрана. Он зависит как от толщины, так и от структуры film. Чем толще материал, тем ниже его паропроницаемость.
- Durability is an important indicator of installation performance. The vapor barrier should not break during installation, but must withstand maximum loads. The reliability of the entire coating depends on the safety margin of the material.
- Water resistance. So that moisture could not penetrate into the insulating material and inside the building, the vapor barrier must hold water well on its surface.
Fireproof. Provided by the resistance of the film to the fire. - Ecological indicators. For the manufacture of material should be used safe raw materials and modern clean technologies.
- Durability. The lifetime of the roofing pie directly depends on the service life of the vapor barrier film.
- Sustainability. The ability of the material not to lose its quality indicators for a long time.
Which one to choose
Modern manufacturers offer an extensive range of materials for proper arrangement of vapor barrier. It is important what vapor barrier to choose for the roof, because they all have different quality indicators and properties, performing almost one function. There are the following types of special films.
Waterproofingpreventing the ingress of moisture into the layer of insulating material. Due to their microperforation structure, water vapor can freely pass through the coating to the external environment. Laying the film should be done so that it and the roof covering separated crates.
Note! With the help of a ventilation gap, air circulation is increased and vapor barrier is improved. Thus, the film with one-sided permeability keeps the insulant and structural elements dry.
Антиконденсатные film. Внутренняя поверхность материала имеет специальный адсорбирующий слой из нетканого текстиля, с его помощью хорошо удерживается и быстро выветривается влага, не скапливаясь в теплоизоляции и на внутренней поверхности покрытия. Такой тип film отлично справляется с пароизоляцией и улучшает свойства теплоизоляционного материала.
The film is laid with an adsorption layer to the room, and is fixed with a counter-grill, taking into account the fact that the rafters step should be no more than 1.2 m. molds may form.
Vapor tight film. Widely used to create a protective barrier on the inside of the insulating material from the inside of the room. The three-layer material with the supporting reinforcing net, polyethylene film laminated from two sides can belong to them. High-quality polypropylene fibers woven mesh create high strength, and the laminated coating provides good waterproofing properties of the film.
Обратите внимание! Монтаж film выполняется к внутренней стороне утеплителя с обеспечением вентиляционного зазора, что не даст образовываться конденсату с внутренней стороны материала.
Vapor barrier roof is one of the important components of the construction of a cozy home. It creates favorable conditions for the operation of any structure, increases the service life of all structural elements.
We hope that this material will help to make the right choice. Moreover, modern manufacturers offer a large range of vapor barrier materials, which allows you to choose the best option for any roofing material, as well as for its structural elements.
Video
Find out why you need a vapor barrier and waterproofing, how to install a vapor barrier: