Interventure insulation: the pros and cons of use. What is jute interventure insulation
In the forest regions of Russia, Scandinavia, Canada and North America, chopped houses have long been built. Logs or beams are consistently stacked in rows, which are called crowns.
What is it for?
Preparing the tree trunk for use inThe quality of the wall material is now made by machining on special machines. Logs are cylindered by turning and have an ideally circular cross-section along the entire length. A profiled glued beam, which has special grooves for a more dense connection, is considered the best material for walls made of wood. But in this case there is also the possibility of blowing the walls through the horizontal seams between the crowns.
The tree is a living material. It is the unique natural qualities of wood that make the atmosphere of the chopped house so valuable. But from here and the main drawbacks of wood as a building material. It is subject to shrinkage and deformation due to seasonal changes in temperature and humidity, from the difference between the internal microclimate of the building and the atmospheric conditions, from the multidirectional loads experienced by different parts and structures of the house.
To prevent possible heat losses and to compensate for inevitable deformations, an interventure heater is necessary.
The function determines the quality
Intervent insulation must have the necessary properties.
Sufficient density and elasticity are necessary to eliminate the formation of gaps during the operation of the house. It should not be wrinkled from the vertical load and fill the voids that form.
Low thermal conductivity is needed to protect againstloss of heat. The ability to absorb excess moisture from the air and give off water with its lack is one of the advantages of wood. Interventure insulation must also have a vapor permeability, so as not to reduce the comfortable qualities of wood. Hence the increased requirements for environmental friendliness. The isolation of harmful substances or allergens by a heater will negate the beneficial effect on the human body of the natural environment of a wooden house. It also excludes the creation of an environment for the development of harmful microorganisms.
Durability andeconomy. The need for frequent replacement of insulation and repair of seams will lead to unnecessary costs when operating a house. For decades, only high quality material can not change the physical and mechanical properties and chemical composition. Biostability is important, that is, an interventure heater should not rot and become moldy, should not become food for birds, rodents, moths, etc.
In the beginning there was moss
Moss with long fibers (red moss, sphagnum,kukushkin flax) is a traditional material for the warming of log houses in Russia. Its excellent qualities - low thermal conductivity, the ability to absorb and return moisture depending on the humidity of the ambient air, bactericidal properties - it is difficult to reproduce in artificial materials. The main drawback is the difficulties with the organization of the industrial billet and the complexity of the laying.
Material based on vegetable fibers - the bestinterventure heater. Especially when it is specially prepared for stacking on logs or beams. Flax fiber, hemp (hemp fiber) has long been used in the form of heat insulation and caulking stitches. Modern manufacturers pass them through carding and needle-punching machines and offer convenient in use rolled coils of linen felt and ribbon pakli.
In a similar form is delivered to the construction market and jute intervent insulation. It is based on raw materials of vegetable origin, supplied to Russia from the countries of South-East Asia and Africa.
Not all fibers of natural origin can beUse as an interventure heater for timber or logs. Cotton or wool batting, felt is absolutely not suitable for this purpose. In addition to low density, they strongly absorb water, and in the wool, a moth is inevitably started.
Mineral and synthetic
In modern construction for the insulation of walls,ceilings, ceilings, roofs, many materials are used in the form of mats, blocks, coils, aerosols, etc. They have excellent indicators for thermal protection and moisture resistance, but they are absolutely not suitable for use in wooden housing construction.
The main reason is a complete discrepancyvapor permeability requirements. Heaters based on glass wool and basalt mineral raw materials under the weight of crowns are squeezed. Air from the space between the fibers is squeezed out and an impermeable barrier is formed for the water vapor contained in the air and in the wood itself. In addition to the deterioration of the microclimate of the dwelling, excess moisture condenses on the boundary of the wood and insulation and gradually destroys the wall array. In winter, places of accumulation of moisture freeze and the process of destruction of structures is accelerated.
There is no ventilation in porous polymericmaterials. Expanded polystyrene, foamed polyethylene, rigid polyurethane foam, foam rubber, assembly foam, sealants and their combinations can not be used as an interventure heater. In addition to the wasted money, you can get a house that is unsuitable for life and losing strength.
Exotic guest
In addition to flax and hemp there is another vegetablefiber. The jute interventure heater is gaining popularity. Jute is a vegetable fiber extracted from the same-named one-year-old shrub growing in the subtropical regions of Asia and Africa. It refers to the spinning (bast) plants of the family of lime trees. On the field of application is similar to flax and hemp (technical hemp), but has some qualitative differences.
Of linen make and clothes, and linen, andfrom jute - a technical cloth for containers and ropes. In comparison with other plant fibers, jute is more rough and brittle. Specialists attribute this to the increased content of lignin in jute. It is a natural high molecular weight polymer that causes lignification of plant cells. In this jute almost no pectin and wax, giving elasticity and flexibility.
Elementary fibers, forming a jute strand,much shorter in length than in flax and hemp. Hence the increased hygroscopicity (the ability to absorb moisture), because The capillaries formed in the fiber are shorter, the water is easier to saturate them.
Advantages and disadvantages of jute insulation
Inter-insulated insulation made of jute fiberIt is made in the form of a pakli or felt tape with a thickness of 5 - 15 mm. The tow is better suited for a wall made of logs or beams prepared without the use of calibration on machines. Strips of insulation are conveniently laid on the rows of round logs and profiled glued beams. It is convenient to fix the tape with a stapler, smooth edges do not require additional caulking of seams, it is convenient to make mounting holes for nagels, etc.
Physical and technical qualities of jute fiberdetermine the pros and cons of the interventure heater made of it. Jute gives it a density, uniform throughout the entire length, resistance to decay, durability. Increased hygroscopicity can become a disadvantage of the material: excessive moisture accumulated in the insulation can lead to freezing of the wall. Insufficient plasticity can lead to the formation of voids in the joints between logs or a beam.
Approximately 2% of the cost of building a house ison the interventure heater. The price per meter of the lnnovatin strip 20 cm wide at a thickness of 8-10 mm averages 6 rubles. A similar insulation of 100% jute - 12 rubles. Jute is an imported product, its value is higher than domestic linen raw materials.
The best choice
Practice of professionals in wooden housing constructionshows that a strip of needle felt from a mixture of flax and jute fiber is the best interventure heater. Jute adds elasticity and durability to the linen insulation. The share of jute fibers can be 10 - 50%. It is important to remember that the use of secondary raw materials (recycled jute sacks) significantly worsens the quality of the insulation.
