Is it possible to use a blued pine board. Blue on the tree: causes, danger, methods of disposal

The eternal problem of freshly sawn material or the main questions of customers. How to store material? Correspondence example:

QUESTION client:

A stack of new, purchased pine boards lay for 2 weeks, after which some of the boards went black and blue in spots. The boards lay on sleepers laid on the ground, each layer was laid with a bar. In each layer, the boards were laid with a gap of 1-2 cm, during the rain they were covered with a film.
Tell me, please: What is this black and blue disease and is it possible to “cure” pine?

ANSWER TorgLes-a:

Hello Dear Client!
I have been manufacturing and supplying lumber for 15 years. I sell lumber at the Slavic World market.
Your mistake was that in dry and hot weather the wet board remained closed, thus Greenhouse effect and the board turned blue. In fact, this is a common headache, as a seller as well as a buyer. Because the suppliers do not comply with any standards, because the harvesting technology and GOST are becoming a thing of the past as the Union.
A freshly felled and sawn tree will definitely turn blue. That is, we are talking about a violation of the harvesting technology, since a sawn tree in a round timber must be left to winter, when temperature regime does not rise to -10 degrees Celsius. That is, moisture is removed by freezing by squeezing out of the pores - in a natural way.

Winter Wood- the most favorable for construction, because it has a lower percentage of humidity and is further less susceptible to the effects of fungal bacteria, i.e. it does not turn blue.

Tree felled in spring and summer- does not freeze and has high humidity. The board and timber starts to turn blue despite the fact that you laid it out on gaskets and covered it, moreover, even when transporting it to the customer’s construction site in a car closed type the material may darken in places.
Especially a small board with a cross section is subject to this process, sometimes very rarely.

Because of this, disputes often arise between the supplier and the customer. Many capricious Citizens are not in the house that darkening is a property of freshly cut and sawn pine material and does not lose its building functions as a board or timber material.

Sometimes when sawing logs, it becomes clear that the forest is blue in the bud. I, as a supplier, consider this issue as a loss presentation, the only question is the price. Moreover, we dissolve it as a 2nd grade, i.e. we leave one working surface (we maintain the size in width), the other comes out ashed. Because this board has no special claims to quality and goes to rough work.

FALSE sellers and suppliers:

By the way, the statement of many sellers and suppliers of edged lumber that they sell winter wood in the midst of the “Construction Season” is a “FALSE”. As a rule, by mid-July-August, wood harvested in winter from suppliers who serve large metropolitan areas ends. And then goes to the case "SVEZHAK". That is, a tree after cutting down in a round timber is immediately delivered to a sawmill and sawn to the ordered sizes.

Why is this happening:

• because lumber natural humidity is of biological origin and reacts with the environment.
• temperature fluctuations, and fluctuations in humidity during the entire time after processing into edged lumber naturally affect the external and internal condition of the wood.
• shavings that remain after sawing on a beam or board first begin to rot and react with the environment and, naturally, with wood. From what the board or timber is covered with a green coating.
• from improper stacking.

This question has a simple and obvious answer.

Water-soluble antiseptics that protect against mold include sodium fluoride, sodium fluoride silico, ammonium fluoride silico, VVK-3, HHP and MCHC. Their solution is applied to the wood with a brush or by spraying.

I strongly recommend the obligatory septation of edged softwood lumber of natural moisture, regardless of the season and the condition of the wood (the material has turned blue or completely white).

SENEZH "EFFO" - properties:

Deep bleaching of wood due to increased penetration.
- Intensive formula of the bleaching composition SENEGE EFFO based on an oxygen-carrying agent.
- SENEGE EFFO retains the effectiveness of bleaching during long-term storage.
- The whitening composition does not leave chemical burns on treated wood.
- Bleached wood is safe for humans and pets.
- Wood bleach SENEZH EFFO removes all types of surface damage to wood.
- Suitable for both indoor and outdoor use.
- The whitening composition withstands freezing without loss of properties.
- SENEGE EFFO self-neutralizes, does not form efflorescence on the surface.
- Wood bleach SENEZH EFFO is suitable for processing food wooden shipping containers.
- The bleaching agent has a pleasant lemon smell.

By the way, there are still a number of positive points.There is a "NATURAL SELECTION" of the board, i.e. it will be possible to find out which board and where to put it in during the construction process, because some boards will be twisted in the sun and they can be put aside and used for rough work (formwork, scaffolding, subfloor, etc.), the rest of the boards, the longer they lie, the greater the “WEIGHT” as the material will gain.

If you have a wooden house or boards from which you are going to build a frame house, then you may encounter such a problem as changing the color of the boards for a variety of reasons.

Of course, boards blacken not only in frame houses, but also in any other wooden houses blue may appear on the boards, but since we are talking about skeletons, I will tell you about them.

So, if your boards have darkened, you must determine what color they have become in order to understand whether it is weathering (blue) or rot. If the blue is on the boards, then the boards are simply weathered, this will not affect the strength. But if the board is blackened, then something needs to be done about it.

If blackened board- it's a mold, or more precisely - a fungus.

For what reasons does the board blacken in a frame house?

The main reasons for the blackening of the boards just three:
1. Systematic waterlogging of boards;
2. Insufficient ventilation of boards of natural moisture during their drying;
3. Misformed knots frame house:
- Incorrectly installed films in frame house(about correct installation films, read), which leads to the locking of moisture in the boards.
- ventilation gap is not made in or there is no waterproofing of the facade
- air ducts are incorrectly made in and other similar problems.

But that's just the first part of the problem. main reason blackening boards is finding boards in conditions where they cannot dry out. Moisture is not terrible for a tree if it is then completely dried. If the board is left in a humid atmosphere, then mold may gradually appear on the boards, and the board itself may rot.

What to do with blackened boards?

Stage 1. Remove and whiten
If you don't want to inhale mold in a frame house (often airtight until vented), then remove your boards (if they are already installed). Now we bleach with some kind of whiteness or other chlorine-containing liquid. Before this, you can cut the board a little if the blackening is very strong.

Stage 2. Dry
Now lay them out with gaskets in a pile, let them dry (there should be a roof on top, do not close from the sides).

Stage 2.1. Rinse
Between bleaching and applying an antiseptic, it is imperative to wash the treated surface. Read more in the comments.

Stage 3. Antiseptic
After drying the boards, they must be thoroughly antiseptic. How to antiseptic: Senezh Ultra, Rogneda Biosept Ultra, Senezh Neo, Rogneda Frost, Neomid 500 and other potent antiseptics.

Is it possible to use blackened boards in the construction of a frame house?

After these 3 steps board can be used, it is better in not the most responsible places (that is, it should not be in the rafters and the floor).

And if the boards are not black, but white mold, then you can throw them away or burn them. This is already internal decay of the middle, the tree becomes less strong, it can no longer be saved.

By the way, if there is blue mold on the tree. Most likely this is a blue color caused by special fungi. They do not affect the strength of the tree, but only the aesthetics. It is not necessary to remove them. At most, they can damage protective covering on this tree (paint, etc.), so that they should only be used in places that are untreated and not visible to the eye and preferably ventilated.

Stay in touch!

The eternal problem of freshly sawn material or the main questions of customers. How to store material? Correspondence example:

QUESTION client:

A stack of new, purchased pine boards lay for 2 weeks, after which some of the boards went black and blue in spots. The boards lay on sleepers laid on the ground, each layer was laid with a bar. In each layer, the boards were laid with a gap of 1-2 cm, during the rain they were covered with a film.
Tell me, please: What is this black and blue disease and is it possible to “cure” pine?

Hello Dear Client!
I have been manufacturing and supplying lumber for 15 years. I sell lumber at the Slavic World market.
Your mistake was that in dry and hot weather, the wet board remained closed, thus there was a greenhouse effect and the board turned blue.
In fact, this is a common headache, as a seller as well as a buyer. Because the suppliers do not comply with any standards, because the harvesting technology and GOST are becoming a thing of the past as the Union.
Freshly felled and sawn pine is sure to turn blue. That is, we are talking about a violation of the harvesting technology, since a sawn tree in a round timber must be allowed to spend the winter, when the temperature regime does not rise to -10 degrees Celsius. That is, moisture is removed by freezing by squeezing out of the pores - in a natural way.

Winter Wood- the most favorable for construction, because it has a lower percentage of humidity and is further less susceptible to the effects of fungal bacteria, i.e. it does not turn blue.

Tree felled in spring and summer- does not freeze and has high humidity. The board and timber begin to turn blue despite the fact that you laid it out on gaskets and covered it, moreover, even when transported to the customer’s construction site in a closed type machine, the material may darken in places.
This process is especially susceptible to a small board with a section of 100x25, 150x25, sometimes 150x40 and very rarely timber. Because of this, disputes often arise between the supplier and the customer. Many capricious Citizens are not in the house that darkening is a property of freshly cut and sawn pine material and does not lose its building functions as a board or timber material.

Wood and board 2-GRADE- sometimes when sawing logs it becomes clear that the forest is blue in the bud. I, as a supplier, consider this issue as a loss of presentation, the only question is the price. Moreover, we dissolve it as a 2nd grade, i.e. we leave one working surface (we maintain the size in width), the other comes out ashed. Because this board has no special claims to quality and goes to rough work.

By the way, the statement of many sellers and suppliers of edged lumber that they sell winter wood in the midst of the “Construction Season” is a “FALSE”. As a rule, by mid-July-August, wood harvested in winter from suppliers who serve large metropolitan areas ends. And then goes to the case "SVEZHAK". That is, a tree after cutting down in a round timber is immediately delivered to a sawmill and sawn to the ordered sizes.

Yes, I agree that there is one and reliable way removal of this problem - "SEPTING".
But there is also the old-fashioned way, when there was no chemistry at all, by the way, many sellers on the market still use this method:
In good dry, sunny weather, row by row, the board is laid out in the sun and dried. Under influence sun rays the board is fired and the surface darkens a little and the places of stain formation also, later stains and blue do not appear anymore. (don't forget to turn them over during the day)

It looks like a board that lay in the sun and dried up (in the photo on the right), on the left (SVEZHAK):

By the way, there are a number of positive points here. There is a "NATURAL SELECTION" of the board, i.e. it will be possible to find out which board and where to put it in during the construction process, because some boards will be twisted in the sun and they can be put aside and used for rough work (formwork, scaffolding, subfloor, etc.), the rest of the boards, the longer they lie, the greater the “WEIGHT” as the material will gain.

In total, there are about a hundred species of marsupial fungi of the genus Ceratocystis in nature, which stain certain species. tree species in Blue colour. In wood protection guides, the term blue or chemical color is used to refer to such fungi.

The most famous blue of the pines, which colors the lumber sawn from pine in a bluish-gray color. Pine lumber begins to turn blue when wet and warm weather sets in, when the average daily temperature is above + 10 ° C degrees, while for blue to appear, wood moisture content of more than 20% and poor ventilation. For the Ural region, this time usually comes at the end of the May holidays and ends with the onset of the first frost, so it is more advisable to purchase lumber for construction in the winter.Purchased lumber is stored at the construction site in piles on spacers, i.e. each row in a stack for better ventilation separated by spacers. Such stacks of lumber are very well ventilated during the spring months, and by the beginning of the construction season you get dry lumber with a moisture content of about 18%, which is no longer afraid of blue.

Blue lumber with a moisture content of less than 20% humidity is quite suitable for construction purposes, the strength of such lumber does not deteriorate, it is also noted that when such wood is painted or coated with any compositions, the absorption of such wood is much higher. However, it should be remembered that it is necessary to prevent the recurrence of suitable conditions for the growth of the fungus, since the process of blue development will be started again.

Blue on wood can also develop in an already built house, again if there are favorable conditions for its development. As a rule, if blue develops inside the house, then this first of all indicates very poor ventilation of the rooms in the house, excess moisture is not removed, thereby contributing to the development of blue, and then the appearance of mold.

During normal use of a house built using lumber, the wood inside the building has a moisture content of about 6 - 12%, and on the outside of the house, such as the roof area, the edged board has a moisture content in the range of 15 - 18%. It follows from this that, only for very complex weather conditions(rainy season, flood) and poor ventilation, wood moisture in such areas can exceed 20% level.

Sultry hot days in summer, high humidity, not those conditions that would have a favorable effect on wood conifers. But no one canceled the construction season. At stake is the repair of houses and their construction with timber. In this regard, the question arises of what to do if the acquired wood has acquired a blue color.

Summer is always the repair and construction of wooden objects. As a rule, edged lumber is more popular. Many of those who have ever encountered repairs or construction from wood ask themselves the question of what to do if the already acquired wood material is covered with mold and has become with a blue tint.

For experienced builders, this kind of problem, has ceased to be news. They treat all these phenomena quite calmly, although sometimes this happens very inopportunely. Some experts in this area of ​​material in the construction and repair of wooden structures learn about all the nuances of wood from the Internet, and not in practice. Such experts have to be taught in the process of work, since their knowledge, which is very far from reality, all their information is semolina With huge amount terms that do not correspond to reality in the world of poly materials.

Little advice!

The one who is building for the first time, who has never dealt with wood, build, repair wooden structure better in early summer or early spring.

It is also worth noting here that the terms dry green forest lumber are completely different groups wood material.

The green forest is a living forest, without bugs, spiders, or any other types of insects, not a burnt forest and not a dead forest.

And a dry forest is a dead forest, the wood of which is damaged as a result of a fire, windfall trees, trees infected with some kind of insects.

Attention!

If you unknowingly bought dead wood, burnt wood or wood with larvae, then you can stop reading this article. Everything about dead wood and wood from it can be read in another article. Here we are talking about living wood, without damage and pests, which has darkened or become moldy.

What are the reasons that the wood changes its color, darkens, blackens and becomes moldy?

In a nutshell, it is worth emphasizing that this phenomenon is not new, it is the most widespread problem.

Here it is worth saying that a fresh cut will always turn blue in summer and early autumn. But this is not a reason to freeze construction. All wood with individual moisture, after being exposed to external environment, reacts to changes in humidity and, as a rule, the color of the wood turns pale. The longer the board interacts with the environment, the more pronounced the color change. To do this, having bought lumber, before the start of construction, it is necessary to fold it in one foot and cover it tightly. When dried, the boards in the folded stack do not change their natural color, except that the first and last row of the folded stack of lumber will turn blue.

But did you know that if the board turned green, if the floor beams darkened, then there is nothing to worry about. This is a completely normal phenomenon of wood after being affected by environment. This type changing its color is not the reason for its unsuitability. After all, lumber from the company Lessevermarket.ru is still a building material of biological origin. And the color change of the wood is inevitable. The main thing is that the building material is not covered with a moldy greenish coating. This is a clear sign of fungal infection. To prevent this from happening, before starting construction, the material should still be treated with special antifungal solutions. Thus, you prevent the appearance of another fungus that acts destructively on the structure of wood, the process of decay begins.

How to avoid the problem when starting work with the material?

The first thing you need to pay attention to is the climate. work with wood better in summer and autumn. In no case do not start construction or repairs in the winter. That is why in winter time year, the price of lumber is much lower than in the summer-autumn period.

The second, no less important, is the manufacturer and the delivery time of the material. You need to deal only with experienced companies. So, your time and nerves will not be wasted.

Third, if you need the highest quality lumber, then you better fit acquisition of planed dry lumber. It is easier to work with it, shrinks less, and is easier to transport. The main thing during transportation is to cover the forest plastic wrap, to prevent moisture ingress, but it is better to store and transport dry lumber in closed-body vehicles and store in a closed, well-ventilated area.