Construction of chamber-drying profiled timber. Wooden construction is becoming more and more popular in Russia. This is due not only to the fact that materials have become more accessible, but rather because people increasingly want to live in houses that are considered environmentally friendly, especially since wood adds coziness to housing. Chamber-drying profiled beams have become very popular lately.
Planed wood is an ordinary wood material processed on a sawmill with a rectangular or square section, and also does not have additional processing in the form of wood drying and edge processing.
As a result, we have ordinary wood with uniform geometric parameters and suitability for construction. But keep in mind that during operation, the planed timber begins to lose its moisture, as a result of which the building will give a noticeable shrinkage, and this, in turn, leads to a distortion of the building and the loss of the linear contour.
Glued wood is an expensive lumber made by gluing wood lamellas together. Interestingly, before starting gluing, they undergo initial processing, grinding and drying in a chamber, which makes it possible to obtain an ideal material for construction, which does not have a tendency to cracking and shrinkage.
This parameter is retained due to the fact that the timber has moisture.
But keep in mind that the cost of the material is quite high. For this reason, developers prefer to buy kiln-dried profiled logs for construction from manufacturers who have an excellent reputation. It is this type of wood that perfectly combines a pleasant price and normal quality, which is suitable for construction.
Please note, that illiterate specialists argue that it is almost impossible to achieve a decrease in humidity due to the fact that there are difficulties in performing work and the fact that the tree has a predisposition to damage when change of linear parameters during drying.
But we want to assure you that the production of profiled timber with reduced humidity is quite realistic and is already being practiced in Russia, and successfully.
According to GOST 8242-88, lumber is considered dry if its moisture content is not higher than 20%. In order to figure out what exactly is a dry profiled beam, you need to figure out what are the requirements for humidity. As we have already said, wood is considered dry if its moisture content is not more than 20%. If the wood has a moisture content of 22 to 28% and higher, the wood has natural moisture.
Please note that the recommended moisture content of wood for construction work should be from 15 to 20%, this condition is regulated in GOST 475, GOST 23166, GOST 8242 and GOST 4981.We also note that the requirements for the wood from which skirting boards, fittings, vents, window sills and others are made are more stringent. For these parts, the wood must have a moisture content of 9 to 15%.
Interestingly, there are three ways to reduce moisture levels:
Naturally, the second and third technologies relate to forced drying of the tree. How real it is and how the process looks from the outside, we will consider below.
Production of dry profiled beam of chamber drying is carried out on high-precision equipment and is performed in several steps. Note that the main point is precisely the drying of wood.
So, the tree for drying must go through the following processing stages:
Important! If a manufacturer says that a tree can be perfectly dried in just 30 hours, this is a clear deception and forgery. Drying of raw materials even under compulsory conditions is carried out for at least 20 days, while this technology has been used for a long time and very successfully even in Europe, and the time indicators are no less.
In the process of harvesting dry profiled timber chamber drying has its own certain nuances and subtleties that not every manufacturer can handle.
Perhaps the most important feature is the availability of expensive and high-precision equipment for forced drying of wood.
Cameras must be equipped with ventilation, heating and cooling systems. Believe me, not every company can afford such a thing.Also, due to the difficulties in the process and the high percentage of rejection during drying, most simply refuse to do such work. As you can see, the cost of such an event is quite high.
It is for this reason that suppliers and manufacturers cannot put low prices on the material due to the use of chamber drying technology.
Interestingly, that if someone tries to offer you a minimum price for wood that has supposedly passed chamber drying, there is definitely a catch. The fact is that the costs incurred by the production of dry wood simply will not pay off if you put low prices on the material.
When lumber dries, it quickly loses its moisture. In this case, the tree will warp, crack and even lose its shape.
To avoid this, cuts and technical notches are specially made on the timber, which will make it possible to compensate for the internal stress of the tree. In addition, for each type of section, the material has its own temperature regime of processing, which will help to dry the timber as carefully as possible.
Each section has its own temperature regime, and technologists constantly monitor the wood processing process. Thanks to this, the output is ideally prepared for the upcoming construction material.
The timber that is dried in the chambers partially differs from the rest of the sawn timber with special advantages:
But it would be unfair not to mention some of the shortcomings:
From the point of view of properly dried wood, it simply cannot be low.
Good advice! In order not to get caught and not buy defective material, you can buy or borrow a hand-held moisture meter from your friends and use it to measure the moisture content of the timber, and then compare it with the manufacturer's declared one.
There is one more kind of forced drying of wood, but it is practically not used in Russia. The reason for this was the high cost of the technology, as well as the need to install high frequency generators. The fact is that such drying implies a large consumption of electrical energy, which means that the manufacturer will incur high costs for electrical energy. As a result, the cost of the expenses will be included in the cost of the timber, and this is not interesting and unprofitable for the Russian buyer.
The technology of wood drying with electric current consists in continuous supply of high frequency current to the tree.
As a result of this process, wood will play the role of a dielectric, through which electricity will evenly pass and be converted into thermal energy. Thanks to this approach, the wood will be evenly dried along its entire length.
This technology is the cheapest, but it is irrelevant due to the fact that the process is long, which means that the speed of production is reduced.
The timber that has been processed at the sawmill is laid out under a canopy with wells and dried for about 30 to 45 days, while the wood is dried unevenly, since in those places where the tree comes into contact with the tree, there are places with an increased level humidity.
This material is often treated with adhesives or lime mortar in order to compensate for the internal stress of the wood.
But naturally drying timber, when used, will still overgrow with cracks and begin to gradually lose linear contours.
Disadvantages of the method:
This material has only one advantage, and that is the price.
But believe me, the cost of finishing and performing insulation will ultimately give you the same amount as the cost of a high-quality chamber-dried profiled bar. At the same time, labor costs will be 2 times less.
Prices for dry timber depend a lot on the section of the timber.
So, according to the average indicators in the Russian market, manufacturers and suppliers offer the following price for products:
5 * 2 cm - 200-240 dollars per 1 m 3 .
Remember that it is not enough just to profile the timber along the edges, since you should also dry it well along its entire thickness and length.The drying process must be carried out in compliance with all requirements and rules. If the technology is violated, the cost of the goods will be lower.
Therefore, try to buy materials only from trusted manufacturers at not discounted prices.
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