The company "BRAND" LLC is engaged in the harvesting and processing of wood conifers - Siberian larch, cedar and Angara pine on the territory Krasnoyarsk Territory. We are production full cycle woodworking: from logging and sawing roundwood to lumber production and supply finished products to St. Petersburg and the Leningrad region.
The average values of the specific gravity (HC) of larch, at twelve percent relative humidity, are considered to be a reference indicator, and without any reference to the grade of wood. The undiluted value has no applied value, only taking into account moisture and grade. That is, the assertion that HC can have any effect on the quality indicators of the product will be simply unfounded. And even more so, it is impossible to accurately calculate a stable indicator, taking into account only the cube of dry larch, this is not plastic for you and the humidity (respectively, HC) in it is constantly changing.
The specific weight has practical application only when calculating the (again, average) mass of a particular batch of larch. It is extremely rare for an experimental carpenter to refer to this indicator in order to calculate the possibility of gluing wood. different breeds.
Upload a lead technical terms and highly specialized information - the lot of our competitors in St. Petersburg. Apparently, they seriously believe that in this way it is possible to increase the number of transactions.
Our position on this issue is somewhat different from the established one: if the project is being done by specialists, and cargo transportation is also not available to amateurs, so why stuff the customer with data about what the weight of dry larch can be, because the potential client is interested in completely different indicators.
To satisfy the immediate interest in our products, we can do a lot: harvest timber in the Krasnoyarsk Territory, and process it there for own production. After that, bring a varied assortment to St. Petersburg and sell it at prices below the city average. If you decide to buy dry larch or natural humidity in our company, we can even deliver the timber you purchased to any point in the Leningrad Region and, if necessary, assist in the implementation of a wooden project.
But the attempts of a curious client to independently link the strength and specific gravity of dry larch into a single whole will only lead to mixed feelings (due to the fact that the proportions of moisture changes in wood are not unambiguous and depend on a wide variety of factors). At best, there will be a desire to thoroughly study physical characteristics wood, in order to know exactly the specific gravity of larch of natural moisture, depending on the grade of a particular wood.
As in the case of HC, the use by the customer of information on how much dry larch weighs is very rarely justified. For example, if an independent calculation of the foundation is carried out. But do not forget that the larch itself will not remain exceptionally dry for very long (both outdoors and indoors). And the design and estimate documentation is best drawn up by highly specialized specialists. Accordingly, the weight of a cube of dry larch does not have practical sense, as the timber can be delivered and installed by our forces, and in the shortest possible time.
How much does a cube of larch weigh
Specific gravity 1 cubic meter(1 m3) Siberian larch:
- dry (humidity 10-18%) - 600-650 kg;
- in structures protected from moisture - 650 kg;
- impregnated - 800-900 kg;
- in a freshly cut state - 840 kg.
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In life, there are situations when you are faced with seemingly simple questions, but you cannot give exact answers to them. During construction, for example, you may need to answer the question: how much does a cube of pine weigh? No one can give an exact answer right off the bat. The weight of timber primarily depends on its species. The second important factor is humidity. Its density depends on the type of wood, which, in turn, directly affects the weight.
In order to know the necessary information if necessary, let's figure out how much a pine cube weighs. This may be necessary when purchasing timber to ensure that the goods are shipped correctly.
Humidity indicators are divided into four degrees:
- wet (more than 45%);
- crude (from 25 to 44%);
- air-dry (from 19 to 24%);
- dry (from 10 to 18%).
So, a cube of pine is how much? The results obtained are presented in the form of a table.
Wood moisture | (from 1 to 5%) | Standard (10 to 12%) | ||||||||||
Weight depending on the type of raw material
There are several types of pine:
- cedar;
- Siberian;
- ordinary.
The weight of wood also varies from its varieties. If the values for the cedar and Siberian are the same, then the weight of the ordinary differs from them. The figures indicated in the table above are typical for ordinary pine.
The weight of one cubic meter of cedar and Siberian is presented in the table below:
So, knowing the moisture content of wood, using tables, it is easy to determine its weight. This is the easiest way. Such tables are often used in construction, where wood is the main material. They help you pick best option wood for the construction of a structure.
- Name: Edged board 50x150x6000
- Thickness x width x length: 50x150x6000 mm.
- Volume of 1 board: 0.045 m3
- Number of boards 50x150x6000 in m3 cube: 22 pcs.
- GOST: 24454-80
Lumber board size 50x150x6000 is used for the construction of fences, in the construction of houses and baths, in furniture production, for roof lathing, etc. According to the quality of wood and processing, boards and bars are recommended to be divided into grades (selected, 1st, 2nd, 3rd, and 4th). Among the bars, 4 grades are distinguished (1, 2, 3, 4th). Softwood lumber must strictly comply with GOST 8486-86. Nominal dimensions for thickness and width are set in GOST 24454. The drying process of lumber is an effective operation to improve the physical and operational qualities. Drying can be carried out by several methods: artificial (chamber, contact, vacuum) and natural. When dried, the tree shrinks. The right choice of lumber allows you to significantly save cash during construction. Important advantages unedged board- its versatility, low cost, as well as the optimum quality of the material.
Table: board weight 50x150x6000
To carry out construction and cost estimates, sometimes you need to know the weight of the board 50x150x6000 mm. In the presented table you will find the weight of the cube of the edged board. For different tree species we calculated the weight of 1 m3 and combined these data in one table. It is necessary to take into account the fact that the indicated indicators may differ and directly depend on the level of moisture content of the wood. Usually, in the calculations, a moisture content of 20% is assumed.
In addition, in the table you will find the volume of the board 50x150x6000 mm, as well as the number of boards in 1m3 cube for widely used wood species. In the event that you did not find the information you are interested in, then contact us and we will publish it on our resource.
| wood species | Board weight 1 pc | Weight of 1 m3 cube board |
|---|---|---|
| Aspen | 23.2 kg | 510 kg/m3 |
| Pine | 23.6 kg | 520 kg/m3 |
| Linden | 24.1 kg | 530 kg/m3 |
| Birch | 29.5 kg | 650 kg/m3 |
| Larch | 30 kg | 660 kg/m3 |
| Oak | 31.4 kg | 690 kg/m3 |
The edged board differs from the unedged one in that it has the shape of a regular rectangle in cross section. This allows you to stack it evenly, pack it in even bundles, and quite
accurately determine the cubature, that is, the volume of packed materials. If you want to determine the weight of the package, or one cubic meter, it is enough to multiply the volume by the density, which is a reference value and depends both on the type of wood and on its moisture content, that is, the degree of drying.
For the most commonly used wood, you can make a table showing how much a cube of edged board weighs:
lumber type
Weight of one cubic meter, kg
raw pine
890
dry pine
470
raw spruce
790
dry spruce
450
As can be seen from the table, humidity affects how much a cube of edged boards weighs very significantly. Such a large dependence is due to the fact that in the cellular structure it is present in large quantities, and with improper drying, its rapid evaporation can lead to significant distortions in the geometric shape of the boards, bend them.
As a result, it can be argued that the weight of a cubic meter of an edged board can really be determined by the type of wood, referring it to one of the categories.
Light woods include pine, fir and other conifers, as well as poplar. Their average density, that is, the weight of a cubic meter, fluctuates around a figure of 500 kilograms.
Medium breeds - a cubic meter of ash, beech, birch weighs about 650 kilograms.
Heavy breeds, such as oak or hornbeam, have a density of more than 750 kilograms per cubic meter.
How much does one edged board weigh.
How much does one edged board weigh. The most frequently asked question on requests search engines- this is how much one cube weighs, as a result, one edged board. I continue the series of articles on edged lumber.
At the insistence of colleagues and regular visitors to the site, I continue the series of articles dedicated to lumber. This article is a continuation of the article "How much does one bar weigh." We are talking only about pine, growing in the territory in the Middle Part of Russia. I’ll make a reservation right away that the pine growing in Siberia has a denser texture, and weighs more and costs an order of magnitude more expensive. You can even distinguish it visually, but this is the topic of the next article.
The weight of one cubic meter freshly sawn and processed into edged lumber pine is about 860kg.
I will give the calculations in the form of a table for 8486 and recall the calculation formulas.
BOARD SECTION IN MM. QUANTITY, PCS. In 1m3 MATHEMATICAL ACTION WEIGHT OF ONE BOARD IN KG.
Tiu.ru logo300х50х6000
11.1 860kg.: 11.1pcs. 77.5
Tiu.ru logo250х50х6000
13.3 860kg.: 13.3pcs. 64.7
Tiu.ru logo200х50х6000
16.6 860kg.: 16.6pcs. 51.8
Tiu.ru logo150х50х6000
22.2 860kg.: 22.2pcs. 38.7
Tiu.ru logo100x50x6000
33.3 860kg.: 33.3pcs. 25.8
Tiu.ru logo200х40х6000
20.8 860kg.: 20.8pcs. 41.4
Tiu.ru logo150x40x6000
27.7 860kg.: 27.7pcs. 31.04
Tiu.ru logo100x40x6000
41.6 860kg.: 41.6pcs. 20.7
Tiu.ru logo150x30x6000
37.0 860kg.: 37.0pcs. 23.2
Tiu.ru logo200x25x6000
33.3 860kg.: 33.3pcs. 25.8
Tiu.ru logo150x25x6000
44.4 860kg.: 44.4pcs. 19.3
Tiu.ru logo100x25x6000
66.6 860kg.: 66.6pcs. 12.9
To determine on your own how much a cut board with a length of 4000mm and 3000mm, or another, will weigh. I will give an example of a calculation formula in which necessary condition calculation is the number of pieces in 1m3.
For a board, let's say 150x25x3000mm:
1: 0.15: 0.025: 3 = 88.8 pcs. in 1m3
860kg. : 88.8 pcs. = 10 kg.
The weight of this board with a section of 150x25 is 3000mm long. 10 kg.
For a board 150x50x4000mm:
1: 0.15: 0.05: 4 = 33.3 pcs. in 1m3
860kg. : 33.3 pcs. = 25.8 kg.
The weight of one board with a section of 150x50 is 4000 mm long. 26 kg.
At the end of the article, I would like to specifically note that these calculations in Moscow in the markets are the subject of large and small fraud, therefore, each time you need to personally check the “CLASSED LUMBER DIMENSIONS”. Like this! (see photo)
The above calculations in the tables are valid only for lumber of clear "DECLARED DIMENSIONS" with the correct geometry, i.e. corresponding to GOST 8486-86.
For the “Air or Armenian Version” of timber and board, which is sold cheaply at any special sales. prices need a separate approach, because the number of pcs. in 1m3 each time must be calculated separately in accordance with real size which has a beam and a board.
Specific and volumetric weight of wood
Distinguish between the specific gravity of wood (solid wood pulp without voids) and the specific gravity of wood as physical body. The specific gravity of the wood substance is higher than unity and depends little on the type of wood; on average, it is taken equal to 1.54. The specific gravity of the wood substance is important in determining the porosity of wood.
Instead of the concept of the specific gravity of wood as a physical body, i.e., the ratio of its weight, taken in the same volume at 4 °, in practice the volumetric weight of wood is used. Volumetric weight (weight per unit volume of wood) is measured in g / cm3 and is reduced to normal humidity wood - 15%.
In addition to volumetric weight, sometimes they also use the reduced volumetric weight, or conditional volumetric weight. Conditional bulk weight is the ratio of the weight of a sample in a completely dry state to the volume of the same sample in a freshly chopped state. The value of the conditional volumetric weight is very close to the value of the volumetric weight in a completely dry state. The ratio between the conditional bulk density (γcond) and the bulk density in an absolutely dry state (γ0) is expressed by the formula
γ0 = γcond/(1-Υ)
where Υ is the total volumetric shrinkage in percent,
γ0 is the volumetric weight of absolutely dry wood.
Volumetric weight of wood.
The conditional bulk weight has the advantage over the bulk weight that it does not depend on the amount of shrinkage and does not require conversion to 15% moisture content. This greatly simplifies the calculations and provides more uniform results when determining γcond for several samples.
The volumetric weight of wood depends on humidity, on the width of the annual layer, on what position the sample occupied in terms of trunk height and diameter. As the moisture content increases, the bulk density increases.
The change in the bulk weight of wood when dried to a moisture content corresponding to the saturation point of the fibers (23-30%) is proportional to the moisture content; after that, the volumetric weight begins to decrease more slowly, as the volume of wood also decreases. With an increase in the moisture content of wood, the opposite phenomenon is observed.
The numerical relationship between the volumetric weight of wood and moisture content is determined by the following formula:
γw = γ0 (100+W)/(100+(Y0 - Yw))
where γw is the sought volumetric weight at moisture content W, γ0 is the volumetric weight in an absolutely dry state, W is the moisture content of the wood in percent,
Y0 - total volumetric shrinkage in percent when dried to absolutely dry state and
Yw - volumetric shrinkage in percent when drying wood to W% moisture content.
The volumetric weight of wood at a given moisture content can be easily determined with sufficient accuracy from the nomogram proposed by N. S. Selyugin (Fig. 11). Suppose that it is required to determine the weight of 1 m3 pine wood at 80% humidity. According to the table 41a we find the volumetric weight of pine wood at 15% moisture, equal to 0.52. On the dotted horizontal line we find the point of volumetric weight of 0.52 and from this point we go along the corresponding inclined line of the reduced volumetric weight until it intersects with the horizontal line showing the moisture content of 80%. From the intersection point, we lower the perpendicular to the horizontal axis, which will show the desired volumetric weight, in this case 0.84. In table. 5 gives the values of the weight of wood of some species depending on the humidity. furniture restoration
Specific and volumetric weight of wood table Figure13
Rice. 11. Nomogram for determining the volumetric weight of wood at different humidity.
The volumetric weight of wood also depends on the width of the annual layer. At hardwood the volumetric weight decreases with decreasing width of the annual layers. The greater the average width of the annual ring, the greater the volumetric weight of the same breed. This dependence is quite noticeable in ring porous rocks and somewhat less noticeable in scattered porous ones. In conifers, it is usually observed inverse relationship: volumetric weight increases with decreasing width of growth rings, although there are exceptions to this rule.
The volumetric weight of wood decreases from the base of the trunk to the top. In middle-aged pines, this drop reaches 21% (at a height of 12 m), in old pines it reaches 27% (at a height of 18 m).
In birch, the decrease in volumetric weight along the height of the trunk reaches 15% (at the age of 60-70 years, at a height of 12 m).
There are no patterns in the change in the volumetric weight of wood along the diameter of the trunk: in some species, the volumetric weight slightly decreases in the direction from the center to the periphery, in others it slightly increases.
A large difference is observed in the volumetric weight of early and late wood. Thus, the ratio of the volumetric weight of early wood to the weight of late wood in Oregon pine is 1:3, in pine 1:2.4, in larch 1:3. Therefore, in conifers, the volumetric weight increases with an increase in the content of latewood.
Porosity of wood. Under the porosity of wood understand the volume of pores as a percentage of the total volume of absolutely dry wood. The porosity depends on the volumetric weight of the wood: the greater the volumetric weight, the lower the porosity.
For an approximate determination of porosity, you can use the following formula:
C \u003d 100 (1-0.65γ0)%
where C is the porosity of wood in %, γ0 is the volumetric weight of absolutely dry wood.
Table 5 - Approximate weight of 1 m3 of wood of different species in kg
Threshold of the tree Moisture status of the wood
12-18% 18-23% 23-45% fresh cut
Acacia, beech, hornbeam, oak, ash 700 750 800 1000
Birch, elm, elm, chestnut, larch 600 650 700 900
Willow, alder, aspen, pine 500 550 600 800
Spruce, cedar, linden, fir, poplar 450 500 550 800
The weight of lumber has an impact on transportation and storage. When erecting wooden structures weight is also important in determining the loads being transferred to the load-bearing members or foundation. However, when selling lumber, it is measured in cubic meters, which causes difficulties.
What affects the weight of lumber?
Consider the factors affecting weight wooden materials given volume:
wood species. This factor determines the density of the material, since wood of the same species is characterized by similar density values. This indicator already directly affects the weight - the denser the material, the heavier. Average, deciduous trees denser than conifers, so the cube oak board heavier than a cubic meter of pine board.
So, in front of you is a board cube - how much does this or that breed weigh? The weight of wood per cubic meter of lumber is given in the table (kg).
Humidity. Wood is characterized by the ability to accumulate moisture. There are two options here: the board is poorly dried, and retained its natural moisture, or was stored in improper conditions. The higher the moisture content of lumber, the heavier it will be. Therefore, even the same breeds weigh differently. This, by the way, is a way to identify materials stored in poor conditions or poorly dried.
The use of such components in construction is fraught with negative consequences, of which strong shrinkage is not the worst.
It is also unreasonable to use such a board in construction.
Internal defects. Similar to the previous point, internal defects in wood lead to a decrease in density and weight loss.
Artificial and natural drying
Ideally, lumber should dry naturally, i.e. in a ventilated room with a roof or on outdoors under a canopy.
Since dry lumber is more in demand than natural moisture material, accelerated drying methods are used. The question of how safe this is for the material remains debatable. It is believed that artificial drying leads to too rapid evaporation of moisture, which causes a change in the geometric dimensions of the boards. Due to microscopic damage to the fibers, curvature and irregularities are formed. In especially advanced cases, cracks appear.
However, drying with the use of forced air, including warm air performed without fanaticism is unlikely to lead to such obvious negative consequences.
Wood moisture should be taken into account when arranging transportation. Let's say you bought dry boards, but during storage they were exposed to rain and did not completely dry out. Their weight, of course, will no longer be the same as when delivered.
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