When constructing a roof and arranging a ventilated facade, a windproof membrane must be used to protect the thermal insulation material from unfavorable climatic factors. It has an affordable price, simple installation and durability. Manufacturers produce a windproof film with a different number of layers and technical characteristics. A wide range of products makes it possible to select hydro- and windproof membranes in optimal accordance with the tasks to be solved.
Warming of the facades of houses and roofs is done with the help of mineral wool insulation material. Its feature is the structure of light and long fibers, which are blown by airflows during operation. Without protection for several years, the insulation can lose a significant part of its volume, as a result of the thermal characteristics of the building will deteriorate to unacceptable values. To prevent this, use wind protection.
Previously, for this long time used parchment or polyethylene film. These materials have a significant drawback - low vapor permeability. In the process of operation, water accumulates on the inside of the glassine and polyethylene, which is impregnated with a heater. As a result, the thermal conductivity of the thermal insulation material increases and the building becomes cold. These disadvantages are absent in hydrosensitive membranes.
Functions performed by membranes
The windproof membrane, created from polyethylene and polyester, performs the following functions:
- protects the fibers of thermal insulation material from the wind flow;
- Helps reduce heat loss;
- fixes and stabilizes lightweight thermal insulation material;
- protects the heater from atmospheric precipitation.
The membrane is placed from the outside of the insulation over the frame used to mount the insulation boards. Mounted with a construction stapler, must be overlapped and glued with a special tape.
Fields of application of membranes
The high demand for such material as a windproof membrane is caused by the popularity of frame house construction, ventilated facades and residential attics. All these designs are multi-layer, the use of a heater allows not only to improve the thermal characteristics of the building, but also reduce the load on the bearing walls and foundation. As part of the "pie" in most cases is a mineral wool insulation, it is protected from wind, steam, condensate.
The main areas of application of windproof membranes:
- construction of insulated roofs and attic floors;
- ventilated facades;
- interfloor overlappings;
- floors lined with logs;
- skeleton partitions.
Windproof waterproofing film does not significantly increase the cost of work, while it performs important functions, extending the life of the insulation.
Types of windproof membranes
A single-layer windproof membrane made of pergamene and polyethylene is used today in budgetary private construction. The most demanded are two-layer and three-layer membranes made of polyester and polypropylene. Thin layers are connected in a single structure with the help of ultrasound, which provides the material with maximum functionality. In the process of laying, the vapor-permeable windproof membrane undergoes severe mechanical stresses. Gusts of wind, structural details of the frame, protruding nails can tear the material, which leads to a breach of tightness and loss of functionality. For this reason, builders prefer three-layer membranes, one of whose layers is created specifically to provide high strength.
Windproof films are divided into moisture-proof and super-diffusion membranes. Waterproofing and windproof films have good vapor permeability, but are able to protect the thermal insulation only from splashes, snow powder. Their water resistance does not exceed 200-250 mm of water column. The diffusion membrane has a more complex structure, due to which it has high strength and ability to withstand 1000 mm of water column. Such films can be used as a temporary cover for roofs - they will protect the house under construction from rain and small snow, gusts of wind.
Diffusive windproof membrane for walls increases the life of the insulation several times. It is recommended for use in the construction of ventilated facades in critical facilities and multi-storey buildings.
Advantages of using windproof membranes
Windproof membranes have the following advantages, extending the scope of this material:
- simple installation at any time of the year;
- environmental safety for humans and the environment;
- fire resistance;
- resistance to high humidity and solar ultraviolet;
- resistance to temperature changes and severe frost;
- elasticity and strength;
- long service life.
Membranes do not emit harmful substances into the environment, including when heated by several tens of degrees. Since most films are vapor permeable, they create maximum comfort in a room whose walls are protected by this material from external factors.
Most often, windproof membranes are used in ventilated spaces. The flow of air in this case can be compared with the effect of a blacksmith's horn, which can inflate smoldering coals. In the event of a fire, a powerful fire protection is necessary, and for this reason, substances suppressing combustion are added to the membranes.
In the process of installing the roof or facade, there are often problems with the delivery of the finish material. Do not have time to bring up metal roofing, siding, corrugated board or granite - it does not matter, resistant to solar ultraviolet and moisture membranes reliably protect the insulation, rafter structures for several weeks from the negative impact of the environment.
In the event that a pause before the final stage of work is planned, then it is necessary to lay in the project the use of superdiffusion windproof membranes. They can serve as a temporary roof for several months.
Features of mounting windproof membranes
To ensure the functionality of windproof and waterproofing films, they must be properly installed. Most manufacturers of this material each roll is equipped with an instruction, according to which it is possible to easily lay the membrane on the rafter system or fix it on the facade of the building.
Leading manufacturers print their logo on one side of the membrane, this is done not only for advertising purposes. To lay the film you need to print outward, and the reverse side is applied directly to the heater. In this case, the hydroprotection of the thermal insulation material and the vapor permeability of the entire "pie" are ensured. If there is no logo on the film, it can be laid on the heater by either side.
Windproof materials are used in the construction of insulated roofs and in the construction of attics. When using inexpensive two-layer films, it is necessary to create a double ventilation gap: a space of 5 cm should remain between the heater and the membrane, there should also be a gap of 5 cm between the roofing material and the membrane. With the use of superdiffusion membranes, this requirement can be neglected.
When laying the membranes on the walls, it is necessary to start the movement from the bottom upwards, while a 10-15 cm overlap is mandatory, which is pasted with a special tape or mounting tape. A number of manufacturers produce a film with an adhesive layer, which greatly simplifies the joining of two sheets. Do not leave mounting holes or cuts - this will break the integrity of the windproof and waterproofing system. If there are protruding elements, the cuts for them are necessarily sealed.
Windproof films are actively used in the construction of frame houses. They are most often built on a pile or light ribbon foundation. To protect against heat loss, the floor of the first floor is insulated with a mineral wool board. It must be protected from blowing fibers, so first the windproof membrane is laid, and on top of it - thermal insulation, which is protected from leakage by a waterproofing film. Used for frame housing construction insulation and when forming an attic floor. In this case, the thermal insulation is protected from above by blowing the fibers with a draft.
Windproof membranes are inexpensive building materials that can provide a high level of comfort in the house. The use of these films not only protects thermal insulation, but also extends the life of it. Correctly mounted membrane can delay expensive repairs of a ventilated facade or attic for dozens of years. It reliably protects the house from wind, high humidity and will be an additional obstacle in the way of fire.