It is no secret that any modern, energy-efficient house built with the use of thermal insulation materials. With their help, not only insulated exterior walls, and ceiling and roof. However, not everyone knows that, for durable and reliable thermal insulation of the cottage, it is important to pay attention to not only the choice of high-quality insulation, vapor barrier and the unit.
In a warm room is always wet steam is formed, which is much higher than atmospheric pressure. The steam pressure on all building envelope – walls, floors, roof – and tends to go outside. During warmer months, couples can easily pass through the heater and evaporates through the ventilation gaps. However, in winter, in freezing temperatures, it is inevitable, “stuck” in the heat-insulating material: reaching the dew point (the portion of the wall where there are conditions for the conversion of steam into the water), couples will not be able to move on and begin to condense. As a result, insulation, and sometimes the wall itself, will get wet and damaged. To avoid this, in the design added another layer – and vapor.
In need of protection from the steam surface separating the “warm” and “cold” zones. That is, those surfaces which come into contact with an active and warm moist air circulating inside the house. Vapor is always used in the insulation of roofs and basement ceilings. In some cases, if the house has a unheated and non-insulated attic, need a vapor barrier attic floor. When it comes to insulation of walls, sometimes steam is not required – for example, when the outer insulation of houses made of beams, as the tree itself is good delays wet steam. Determine the need for vapor barrier in each case will help Thermal calculation. If the wall insulation is arranged inside the building, then no protection against the couple did not get along.
The vapor barrier is often used as a conventional polyethylene or asphalt. This simple and cheap option – not the best, because these materials are rapidly destroyed. A more reliable and durable special vapor barrier film membrane “METASPAN”.
In areas with high humidity, such as baths and saunas, using another kind of vapor barrier – metallized vapor barrier ( “METASPAN” grade C and D), which in addition to protection from a couple of well reflects the heat radiation into the room.
Regardless of the scope of the vapor barrier, whether the roof, ceiling or wall, the work with the material is subject to the same rules. “METASPAN” protects the structure with insulation against the penetration of wet steam, so is always from the warm room and anticipates the insulating layer. For example, the attic floor structure is as follows (bottom – up): headlining the first floor, “METASPAN” laid the insulation between the joists, wooden floor attic.
It is important that “METASPAN ‘surface is covered with a continuous layer. Any holes and gaps will inevitably lead to a breach of a vapor barrier. Therefore, “METASPAN” mounting brackets made by a staple gun, ideally – through a thin wooden rail, which tightly presses the material to structural wall or ceiling. Some paintings are joined necessarily with overlap of 100 mm and glued tape (as well as all problem areas – abut the window and door openings). Material can not pull strongly, otherwise the film will shrink and thus damaged by temperature changes. . It is better to fix it with a little “slack” in the 1-2 cm And finally, the operation of home repairs and other construction activities do not forget that you can not pierce the surface of isolated nails – you risk to break the vapor barrier integrity and reduce the protection from moisture design.
Following these simple rules will allow you to build a house, which is in any weather will remain warm and cozy and will serve you for years to come.
Metaspan issued the following brands:
– Mark S – material made by bonding a metallized polyethylene terephthalate film with a polypropylene non-woven fabric. The material used for insulation and protection of the internal components of the roof and walls inside the room vapors and moisture from the wind and from the external environment. It is used as an additional layer that reflects infrared radiation.
– Grade B – a material made by bonding a metallized polyethylene terephthalate film with kraft – paper. The material is used as a vapor barrier in hot areas: baths and saunas, etc., as well as a vapor barrier in the construction of insulated walls and pitched roofs, intermediate floors and partitions… The composition and structure of the material allows use it in a high temperature environment, that is, in the sauna, where the temperature is “dry steam” reaches 100 – 120 ° C
– Brand P – material made by bonding a metallized polyethylene terephthalate film, polyethylene film. It is used as an additional moisture, steam, in a non-insulated roofs and floor decks to protect the wooden structural elements of the under-roof condensation of atmospheric moisture and wind, penetrating into the ground loose laying the roof. It is also used as a vapor barrier when constructing the laminate and parquet floors.
– Brand On – material manufactured by gluing non-metallized polyethylene terephthalate film with a polypropylene non-woven fabric. The material used for insulation and protection of the internal components of the roof and walls inside the room vapors and moisture from the wind and from the external environment.