Before carrying out any construction or repair, always calculate the required amount of material. For example: brick, rolled metal or lumber: unedged, edged boards or lining. Usually the seller provides wood delivery services, but it happens that this is not possible. And this question has to be decided by the buyer himself: what kind of machine should he order in order to bring the required amount of timber to the construction site?
Features of lumber
Even if the amount of wood in cubic meters is known, then the choice of machine in terms of carrying capacity will still need to be calculated. Even knowing how much a cube of dry board weighs, the weight of a cubic meter of material on the market can vary significantly. And the reason for this will not only be the type of tree, for example: pine or spruce, birch or cedar, but also the location of the log house, the humidity of the surrounding air, and even the time that has passed since the day of the log house. The weight of a unit of cubic meter of the same wood will also differ from the degree of processing of the material. The mass of the round timber, under the same conditions, will always be less than the mass unedged timber. This is due to the fact that the density of the material in one cube will be different. It is not possible to stack the round timber tightly on top of each other; large voids will remain. The same applies to unedged boards. The surface will not press tightly on the sides.
Therefore, when calculating the carrying capacity of a vehicle, you need to focus on transporting the maximum possible weight of cargo. This means you need to find out how much a cube of edged pine boards of natural moisture weighs? Since this is the state of the tree at the time of its felling, and therefore the maximum humidity and density.
Indicators affecting the weight of lumber
Wood moisture content is very important indicator, which you need to pay attention to. When it is high, the tree swells, and when it is low, on the contrary, it dries out. All construction works It is recommended to use already dried lumber, in which the moisture content does not exceed 15-20%. Otherwise, the installed damp wood, as it dries over time, will change its geometric dimensions (shrink) and thereby violate the integrity of the building.
Dried wood becomes more durable, lends itself well to finishing, is not susceptible to mold and insects, and retains its properties for a long time. construction qualities. Before drying, the remaining bark is removed. This is necessary for uniform drying and to prevent damage by insects (bark beetles).
Forest drying is carried out by specialists outdoors. The timber is stacked on spacers between the rows so that air can pass freely and dry the boards on all sides. It is advisable to locate the drying area in a place where the material is not exposed to direct Sun rays, but there is good ventilation. The top row of the stack must be pressed with a load to prevent deformation.
Weight calculation
Now let's calculate the weight of the most common lumber that you can encounter on the market.
We will calculate the mass using a calculator using the formula M=V*ρ, kg, where:
- V is the volume of material required for calculation, m3. In our case given value is 1 m3;
- ρ - wood density, kg/m3. For freshly cut pine the value is 820 kg/m3.
Substituting into the formula, we get:
Similarly, knowing the density of the material, you can calculate how much a cube of larch board weighs:
This means: no matter what size the edged board is:
- 150x150x6000;
- 25x100x6000;
- 25x150x6000;
- 50x150x6000.
Their weight in one cube will be approximately equal, the main thing is that the composition of the wood, as well as the moisture content, remain unchanged, only the number of boards will differ.
The question arises, how much does a cube of dry board of the same pine weigh? This state of wood is accepted when its humidity is up to 20%. In this case, the density is 520 kg/m3.
The difference in the weight of one cube between pine with natural moisture and dry will be 300 kg! But for construction, not 1 m3 is purchased, but for example 100 or 500. Accordingly, the carrying capacity of the vehicle increases by 30 or 50 tons!
Therefore, when choosing lumber, it is important to know the moisture content of the board. So as not to make a mistake in the choice of transport or the number of trips required to transport the entire forest.
rems-info.ru
People who are building their own house or cottage want to know how much 1 cube of board weighs.
How much does a cube of natural moisture board weigh?
1 cube of board weighs 800-1000 kg (depending on the type of wood)
Now you know how much a cube of natural moisture board weighs in tons and you can accurately calculate the required amount.
Previous articleHow much does a cube of crushed stone weigh?Next articleHow much does a cube of pine weigh?
ktoikak.com
How much does a cube of edged board weigh?
We offer you a table of the weight of the main types of wood.
www.xn—-7sb2akllgi.xn--p1ai
How to correctly count a board in cubes.
An edged board differs from an unedged board in that cross section has a regular shape 
rectangle. This allows you to evenly stack it, pack it into even bundles, and quite accurately determine the cubic capacity, that is, the volume of packed materials. If you need to determine the weight of a package, or one cubic meter, it is enough to multiply the volume by the density, which is a reference value and depends on both the type of wood and its humidity, that is, the degree of drying.
For the types of wood most commonly used in construction, you can create a table showing how much a cube of edged board weighs:
Lumber type
Weight of one cubic meter, kg
damp pine
890
Dry pine
470
Raw spruce
790
Dry spruce
450
As can be seen from the table, humidity has a very significant effect on how much a cube of edged board weighs. Such a large dependence is due to the fact that water is present in large quantities in the cellular structure of freshly sawn wood, and if it is not dried properly, its rapid evaporation can lead to significant distortions geometric shape boards, bend them. 
As a result, it can be argued that the weight of a cubic meter of edged board can be determined by the type of wood, classifying it into one of the categories.
Light wood species include pine, fir and other conifers, as well as poplar. Their average density, that is, the weight of a cubic meter fluctuates around the figure of 500 kilograms.
Medium species - a cubic meter of ash, beech, birch - weighs about 650 kilograms.
Heavy species, 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 in search engines is how much does one cube weigh, and as a result, one edged board. I continue the series of articles devoted to 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 beam weigh?” We are talking only about pine, 
growing in the territory in the central part of Russia. I’ll immediately make a reservation that pine growing in Siberia has a denser texture, weighs more and costs an order of magnitude more. 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 present calculations in the form of a table for sections of GOST 8486 boards and recall the calculation formulas.
BOARD SECTION IN MM. QUANTITY, PCS. IN 1m3 MATHEMATICAL ACTION IS THE WEIGHT OF ONE BOARD IN KG.
logo Tiu.ru300х50х6000
11.1 860kg: 11.1pcs. 77.5
logo Tiu.ru250х50х6000
13.3 860kg: 13.3pcs. 64.7
logo Tiu.ru200х50х6000
16.6 860kg: 16.6pcs. 51.8
logo Tiu.ru150х50х6000
22.2 860kg: 22.2pcs. 38.7
logo Tiu.ru100х50х6000
33.3 860kg: 33.3pcs. 25.8
logo Tiu.ru200х40х6000
20.8 860kg: 20.8pcs. 41.4
logo Tiu.ru150х40х6000
27.7 860kg: 27.7pcs. 31.04
logo Tiu.ru100х40х6000
41.6 860kg: 41.6pcs. 20.7
logo Tiu.ru150х30х6000
37.0 860kg: 37.0pcs. 23.2
logo Tiu.ru200х25х6000
33.3 860kg: 33.3pcs. 25.8
logo Tiu.ru150х25х6000 
44.4 860kg: 44.4pcs. 19.3
logo Tiu.ru100х25х6000
66.6 860kg: 66.6pcs. 12.9
To determine for yourself how much a 4000mm and 3000mm long edged board, or another, will weigh. I will give an example of a calculation formula in which a necessary condition The 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 and a length of 3000 mm. 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 and a length of 4000 mm. 26 kg.
At the end of the article, I would like to specially note that these calculations in Moscow markets are the subject of large and small fraud, so each time you need to personally check the “DECLARED DIMENSIONS OF TIMBER”. Like this! (see photo)
The above calculations in the tables are valid only for lumber of clear “DECLARED SIZES” with the correct geometry, i.e., corresponding to GOST 8486-86.
For the “Aerial or Armenian Option” of timber and boards, which are sold cheaply at all sorts of special sales. prices need a separate approach, because the number of pieces. in 1m3 each time you need to calculate separately in accordance with actual dimensions which the timber and board have.
Specific and volumetric gravity of wood - tables
Distinguish specific gravity wood (hard wood pulp without voids) and the specific gravity of wood as a physical body. The specific gravity of wood matter is above 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 to the weight of water 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 reduced to normal humidity wood - 15%.
In addition to volumetric weight, sometimes they also use reduced volumetric weight, or conditional volumetric weight. Conditional volumetric 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 conventional volumetric weight is very close to the value of the volumetric weight in an absolutely dry state. The relationship between the conditional volumetric weight (γcond) and the volumetric weight in an absolutely dry state (γ0) is expressed by the formula
γ0 = γcondition/(1-Υ)
where Υ is the total volumetric shrinkage as a percentage, 
γ0- volume weight absolutely dry wood.
Volumetric weight of wood.
The conventional volumetric weight has the advantage over the volumetric weight that it does not depend on the amount of shrinkage and does not require recalculation to 15% humidity. This makes it possible to significantly simplify calculations and provide more uniform results when determining the γconditions of several samples.
The volumetric weight of wood depends on humidity, on the width of the annual layer, on the position of the sample in terms of trunk height and diameter. As humidity increases, the volumetric weight increases.
The change in the volumetric weight of wood when dried to a moisture content corresponding to the saturation point of the fibers (23-30%) is proportional to the humidity; after this, the volumetric weight begins to decrease more slowly, as the volume of wood also decreases. When wood moisture content increases, the opposite phenomenon occurs.
The numerical relationship between the volumetric weight of wood and humidity is determined by the following formula:
γw = γ0 (100+W)/(100+(Y0 - Yw))
where γw is the desired volumetric weight at humidity W, γ0 is the volumetric weight in an absolutely dry state, W is the wood moisture content in percent,
Y0 is the total volumetric shrinkage as a percentage when drying to an absolutely dry state and
Yw - volumetric shrinkage as a percentage when drying wood to W% moisture content.
The volumetric weight of wood at a given moisture content can be easily determined with sufficient accuracy using the nomogram proposed by N. S. Selyugin (Fig. 11). Let's assume that we need to determine the weight of 1 m3 of pine wood at a humidity of 80%. According to the table 41a we find the volumetric weight of pine wood at 15% humidity equal to 0.52. On the dotted horizontal line we find the point of volumetric weight 0.52 and from this point we go along the corresponding inclined line of the reduced volumetric weight until it intersects with horizontal line, showing humidity 80%. From the intersection point we lower a perpendicular to the horizontal axis, which will show the required volumetric weight, in in this case 0.84. In table 5 shows the weight of wood of some species depending on humidity. furniture restoration
Specific and volumetric weight of wood table Figure 13
Rice. 11. Nomogram for determining the volumetric weight of wood at different humidity levels.
The volumetric weight of wood also depends on the width of the annual layer. U hardwood the volumetric weight decreases with decreasing width of the annual layers. The greater the average width of the growth ring, the greater the volumetric weight of the same breed. This dependence is very noticeable in ring-pore rocks and somewhat less noticeable in open-pore rocks. In coniferous species it is usually observed inverse relationship: Volumetric weight increases as the width of the growth rings decreases, 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 is no pattern in changes in the volumetric weight of wood along the diameter of the trunk: in some species the volumetric weight decreases slightly in the direction from the center to the periphery, in others it increases slightly.
A big 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 coniferous species, the volumetric weight increases with an increase in the content of late wood.
Wood porosity. Wood porosity refers to the volume of pores as a percentage of the total volume of absolutely dry wood. Porosity depends on the volumetric weight of the wood: the higher the volumetric weight, the less porosity.
To approximately determine porosity, you can use the following formula:
C = 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
Wood threshold Condition of wood moisture
12-18% 18-23% 23-45% freshly 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
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kazap.ru
how much does a cube of pine weigh at natural humidity?
Weight of 1 cube of pine of natural humidity
In chapter Other to the question How much does 1 cubic meter weigh? m pine boards? the best answer given by the author is An edged board differs from an unedged board in that its cross-section has the shape of a regular rectangle. This allows you to evenly stack it, pack it into even bundles, and quite accurately determine the cubic capacity, that is, the volume of packed materials. If you need to determine the weight of a package, or one cubic meter, it is enough to multiply the volume by the density, which is a reference value and depends on both the type of wood and its humidity, that is, the degree of drying.
For the types of wood most commonly used in construction, you can create a table showing how much a cube of edged board weighs:
Lumber type
Weight of one cubic meter, kg
damp pine
890
Dry pine
470
Raw spruce
790
Dry spruce
450
As can be seen from the table, humidity has a very significant effect on how much a cube of edged board weighs. This great dependence is due to the fact that water is present in large quantities in the cellular structure of freshly sawn wood, and if it is not dried properly, its rapid evaporation can lead to significant distortions in the geometric shape of the boards and bend them.
As a result, it can be argued that the weight of a cubic meter of edged board can be determined by the type of wood, classifying it into one of the categories.
Light wood species include pine, fir and other conifers, as well as poplar. Their average density, that is, the weight of a cubic meter fluctuates around the figure of 500 kilograms.
Medium species - a cubic meter of ash, beech, birch - weighs about 650 kilograms.
Heavy species, such as oak or hornbeam, have a density of more than 750 kilograms per cubic meter.
Answer from 22 answers[guru]
Hello! Here is a selection of topics with answers to your question: How much does 1 cubic meter weigh? m of pine board?
Answer from Irina Saburova[newbie]
IN different companies the price may vary significantly. The main thing is not to miss the issue of quality in the pursuit of cheapness. Here is the link by the way, excellent price/quality ratio. Plus they offer discounts if you buy a large volume and give very good advice if you are not very well versed in the matter.
Answer from Alexander Lestorg[newbie]
The Lestorg company is a manufacturer of lumber. Edged boards occupy a significant segment in the total volume of products produced by our company, since construction material from natural wood is in maximum demand in construction industry. We offer to buy edged board from the manufacturer at a competitive price.
1 m3 – 5000 RUR
link
Answer from Osipov Alexander[newbie]
Price for all sizes here link
22oa.ru
How much does a cube of pine weigh? | KtoiKak.com
People who are building their own house or cottage want to know how much 1 cube of pine weighs.
How much does a cube of natural moisture pine weigh?
1 cube of pine weighs 600-800 kg (depending on humidity)
- Dry – wood with a moisture content of 10-18%, which has undergone technological drying or for a long time stored (dried) in a warm, dry room;
- Air-dry – wood with a moisture content of 19-23%. This level of humidity is achieved when long-term storage wood under certain natural conditions, i.e. without application special technologies drying;
- Raw - wood with a moisture content of 24-45%, which is in the process of drying from a freshly cut state to equilibrium;
- Freshly cut and wet - wood with a moisture content of more than 45%, recently cut down or kept in water for a long time.
Now you know how much a cube of pine wood weighs and you can accurately calculate the required amount.
Previous articleHow much does a cube of natural moisture board weigh?Next articleHow much does a cube of raw birch weigh?
When starting to build a house or make renovations, sometimes you have to face questions that seem simple at first glance, but you can’t answer them right away. It seems awkward to approach specialists with such a question, but you need to know for sure. For those who can turn to the Internet, it’s easier - type in a search engine “How much does a cube of wood weigh” and in half a minute received a comprehensive result. By the way, really, how much?
The effect of humidity on the weight of wood
The weight of wood does not always have the same value. What does it depend on? First of all, from the moisture content of the wood. If we compare, for example, oak and birch, it turns out that a cubic meter of oak weighs 700 kg, and a birch weighs 600 kg. But it could be different. Weighing a cubic meter of birch, we get 900 kg, and oak will show the same 700. Or in both cases it will be 700 kg. Why do we get such different numbers? In this case, the moisture content of the wood plays a role.
There are four degrees of humidity: dry (10-18%), air-dry (19-23%), damp (24-45%) and wet (above 45%). Thus, it turns out that different rocks with the same humidity have different weights, as in the first example above. If the humidity is not the same, then the weight may fluctuate in one direction or another. The standard humidity is 12%.
Different density - different weight
Another factor that affects the weight of wood is its density. The most high density for iron and ebony wood - from 1100 to 1330 kg/m3. Close to them are boxwood and bog oak- 950-1100. For ordinary oak, beech, acacia, pear, and hornbeam, the density is about 700 kg/m3. It is even lower for pine, alder, and bamboo - 500 kg/m3. And the lowest is for cork wood, only 140 kg/m3.
Why do you need to know the weight of a cubic meter of wood?
Having knowledge in this area is sometimes very important. When purchasing building material, its quantity cannot be determined by eye by a non-specialist. Knowing the dimensions of the timber or lining, the material from which they are made and its moisture content, simple calculations allow you to determine the weight of the purchased product. How much does a cube of wood weigh? In this case, the answer to this question will help you figure out whether the seller sent you the goods correctly.
Heat transfer from wood
In addition, there is another indicator - heat transfer. It will come to the aid of those who use wood as firewood for heating. The higher the hardness, i.e. density tree species, the higher its calorific value. Of course, no one will heat a room with boxwood, but when choosing between linden and pine or birch and acacia, you can get much more heat if you know which of these species is the hardest. Information about the density of each tree can be gleaned from the tables, since all this information is systematized for ease of use.
Weight of a dense cubic meter, kg
| Breed | Humidity, % | |||||||||||
| 10 | 15 | 20 | 25 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | |
| Beech | 670 | 680 | 690 | 710 | 720 | 780 | 830 | 890 | 950 | 1000 | 1060 | 1110 |
| Spruce | 440 | 450 | 460 | 470 | 490 | 520 | 560 | 600 | 640 | 670 | 710 | 750 |
| Larch | 660 | 670 | 690 | 700 | 710 | 770 | 820 | 880 | 930 | 990 | 1040 | 1100 |
| Aspen | 490 | 500 | 510 | 530 | 540 | 580 | 620 | 660 | 710 | 750 | 790 | 830 |
| Birch: | ||||||||||||
| - fluffy | 630 | 640 | 650 | 670 | 680 | 730 | 790 | 840 | 890 | 940 | 1000 | 1050 |
| - ribbed | 680 | 690 | 700 | 720 | 730 | 790 | 850 | 900 | 960 | 1020 | 1070 | 1130 |
| - Daurian | 720 | 730 | 740 | 760 | 780 | 840 | 900 | 960 | 1020 | 1080 | 1140 | 1190 |
| - iron | 960 | 980 | 1000 | 1020 | 1040 | 1120 | 1200 | 1280 | — | — | — | — |
| Oak: | ||||||||||||
| - petiolate | 680 | 700 | 720 | 740 | 760 | 820 | 870 | 930 | 990 | 1050 | 1110 | 1160 |
| - eastern | 690 | 710 | 730 | 750 | 770 | 830 | 880 | 940 | 1000 | 1060 | 1120 | 1180 |
| — Georgian | 770 | 790 | 810 | 830 | 850 | 920 | 980 | 1050 | 1120 | 1180 | 1250 | 1310 |
| - Araksinian | 790 | 810 | 830 | 850 | 870 | 940 | 1010 | 1080 | 1150 | 1210 | 1280 | 1350 |
| Pine: | ||||||||||||
| - cedar | 430 | 440 | 450 | 460 | 480 | 410 | 550 | 580 | 620 | 660 | 700 | 730 |
| - Siberian | 430 | 440 | 450 | 460 | 480 | 410 | 550 | 580 | 620 | 660 | 700 | 730 |
| - ordinary | 500 | 510 | 520 | 540 | 550 | 590 | 640 | 680 | 720 | 760 | 810 | 850 |
| Fir: | ||||||||||||
| - Siberian | 370 | 380 | 390 | 400 | 410 | 440 | 470 | 510 | 540 | 570 | 600 | 630 |
| - white-haired | 390 | 400 | 410 | 420 | 430 | 470 | 500 | 530 | 570 | 600 | 630 | 660 |
| - whole leaf | 390 | 400 | 410 | 420 | 430 | 470 | 500 | 530 | 570 | 600 | 630 | 660 |
| - white | 420 | 430 | 440 | 450 | 460 | 500 | 540 | 570 | 610 | 640 | 680 | 710 |
| - Caucasian | 430 | 440 | 450 | 460 | 480 | 510 | 550 | 580 | 620 | 660 | 700 | 730 |
| Ash: | ||||||||||||
| - Manchurian | 640 | 660 | 680 | 690 | 710 | 770 | 820 | 880 | 930 | 990 | 1040 | 1100 |
| - ordinary | 670 | 690 | 710 | 730 | 740 | 800 | 860 | 920 | 980 | 1030 | 1090 | 1150 |
| - acute-fruited | 790 | 810 | 830 | 850 | 870 | 940 | 1010 | 1080 | 1150 | 1210 | 1280 | 1350 |
The table shows average mass values. Possible maximum and minimum mass values are 1.3 and 0.7, respectively, from its average value
The transition to alternative energy sources forces us to pay attention to wood. This is what our ancestors used to heat their homes and cook food. Stoves, fireplaces, solid fuel boilers- for all these devices you need wood, namely firewood. But all plants are different, and trees, having different structures and chemical compositions, differ in such characteristics as calorific value, weight, density, and humidity.
How much does firewood weigh?
How to determine weight of 1 cube of firewood? Does it matter what kind of firewood you buy, freshly cut or dried? Knowing the specific gravity, humidity and other characteristics of wood will help you deal with this.
More than 200 species of trees and shrubs grow in our country. They all burn differently, some faster, others slower, some give off a lot of heat, some less. When choosing wood for the firebox, it is better to focus on middle-aged wood; do not choose too young or too old. They burn for the longest time and produce the most heat.
Also, the amount of heat released directly depends on the density and dryness of the firewood. The most suitable wood for sending to the firebox is considered to be wood with a moisture level of 15 - 20%, and in a freshly cut tree the moisture content is at least 50%. Some of the heat will be spent on evaporation of water, so the efficiency of wet firewood is much lower. Yes and weight of dry firewood significantly lower than wet ones.
The weight of wood depends on:
- structure of wood cells, moisture content in them,
- wood density,
- parts of the plant (the heaviest parts are the branches, the lightest are the base of the trunk),
- content of salts and resins.
The weight of firewood can be determined empirically, that is, simply weigh a small piece of wood of a certain volume and, through simple calculations, find out its density (the ratio of mass in kilograms to volume in m3). But such a procedure is not convenient to carry out in all cases.
Tables of average wood weights will help make calculations simpler. The values are given conditionally for a material humidity of 15 - 20%. Interestingly, changing the moisture content of a tree does not change its density, although it greatly affects the specific gravity value.
| Wood species | Specific gravity g/cm3 | Specific gravity kg/m3 | Loading weight of firewood kg/m3 |
| Ash, beech | 0,68 | 650 - 750 | 480 |
| Birch | 0,65 | 620 - 650 | 450 |
| Oak | 0,71 | 650 - 800 | 470 |
| Larch | 0,66 | 580 - 635 | 420 |
| Pine | 0,52 | 480 - 520 | 360 |
| Spruce | 0,45 | 420 - 450 | 330 |
| Acacia | 0,69 | 650 - 750 | 460 |
| Elm | 0,65 | 620 - 660 | 440 |
| Aspen | 0,48 | 460 - 550 | 350 |
What is the best firewood for burning?
Oak firewood is considered the most optimal in terms of calorific value, followed by birch, aspen and pine.
- Oak contains few resins, but releases a lot carbon monoxide. The tart aroma of burning oak logs tones the body.
- Birch firewood burns for a long time and evenly, but has a lot of resinous substances and deposits soot in the chimney.
- Conifers also used less frequently due to high resin content.
- It is not recommended to use firewood from poplar, as it emits an unpleasant, bitter odor and produces little heat.
It is best to use hardwood firewood, which has a high specific gravity. It is advisable that the firewood be dry and not freshly cut. Let us remind you that when buying wet firewood, you pay more for weight, but get less heat.
The Drova72 company conducted an experiment, we weighed 1 folded cube (folder) of birch chopped wood, natural humidity, ~50%. We will discuss the results of this experiment in more detail below.
This experiment in no way claims to be - "scientific" or "100% objective", rather something between information from the Internet and laboratory research. But nevertheless, this is the first step on the path to truth and objectivity.
Next time we will repeat the experiment and try to find a moisture meter, as well as film the whole process on video.
In short, the results
At humidity ~50% and log length ~50cm:
- 1 folding cube weighs ~561 kg;
- 1 tight cubic cube weighs ~790 kg.
In the text below, we reveal in detail the essence of the experiment. The calculation was made based on information from GOST 3243-88 and the sawmill handbook.
Why do we need this?
A small retreat
The volume of firewood in storage meters is measured by multiplying the length, width and height of the woodpile. But the concept of “1 folded cube of firewood” is quite vague, because... firewood in the woodpile can be stacked with different packing densities and there is no GOST or regulation that would explain what “laying density” is and how to measure it. That is, the same amount of firewood (1 conventional storage meter) can be stacked from ~0.7 to ~1.3 foldometers, depending on the packing density and condition of the logs (their curvature, the presence of knots).
For clarity, look at the photo below. It is obvious that the firewood on the right is stacked thoroughly and the number of logs in such a woodpile is greater than in the one on the left. In both cases, the volume of firewood in the storage meters will be the same, but the mass is different. Those. in fact, the amount of firewood in the photo on the left is less. 
In the photo above, please ignore different type firewood, this image shows the density of firewood stacking in a woodpile.
Specifics
Sometimes our clients and I have disagreements regarding the volume of firewood in storage meters. We brought the firewood for stacking in one volume, the client transferred the firewood to his woodpile, measured it, and the volume turned out to be less than originally stated.
In the example above, disagreements almost always arise due to packing density. So we decided weigh 1 folded cube of birch firewood, and compare its weight (mass) with the data, which are presented in GOST 3243-88 and in the Handbook of Sawmilling, Moscow, Timber Industry Publishing House, 1980.
By comparing the weight of our firewood storage meter with data from the above sources, we will understand whether we are packing the firewood tightly enough into the car before delivering it to the buyer.
Sequencing:
- First we will put 1 folding cube in the woodpile.
- Let's weigh this cube on the scales.
- We compare the resulting weight with data from GOST 3243-88 and the Sawmilling Handbook.
By different sources, the humidity of freshly cut birch can vary from 60 to 80%. We purchase firewood birch, which was harvested (cut down) 1 to 4 months ago from the moment it was brought to us for subsequent processing. The humidity of birch is on average 40-50%. We will make calculations based on 50% humidity.
In the sawmill reference book, the weight of a dense cube of ordinary birch at a humidity of 50% is 790 kg. To convert the weight of a storage meter into a dense cube (or vice versa), you need to apply a coefficient. We will take it from GOST 3243-88, with a log length of up to 0.5 meters of split hardwood - coefficient is 0.71.
790 * 0.71 = 560.9 kg
Those. The mass of our split birch firewood storage meter must be at least 561 kg.
We weigh
Conclusions and comments
First of all, we wanted to test ourselves, because... Sometimes doubts arose about honesty towards our firewood buyers. Now the doubts are dispelled. Our stacking density and volume of firewood in stacked cubic meters meets the necessary requirements.
If we turn again to the sawmill reference book (Note 1), it is obvious that the weight of 1 folded cube at a humidity of 50% will not always be 560.9 kg, because the weight of one dense cube is 790 kg - this is an average value and can range from 553 kg to 1027 kg. And, therefore, 1 storage meter of birch chopped firewood (taking into account the coefficient of 0.71) can weigh from 392kg to 729kg. This is probably due to the different densities of trees and logs.
Of course, this experiment cannot be considered 100% objective, because At a minimum, a moisture meter is needed to determine humidity. We can have a forest different humidity because There are many suppliers and the procurement and delivery times are different for everyone; accordingly, forest moisture can vary from 30 to 60%.
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When designing various kinds wooden structures Often they use such an indicator as the weight of the lumber from which they are supposed to be made. It would seem that such information can be obtained from specialized reference books. However, in such literature, unfortunately, only the weight of 1 m 3 of timber or, for example, boards is often indicated. Lumber is often not purchased cubic meters, but just piece by piece.
The length of timber sold by woodworking workshops may vary. But most often such enterprises sell 6 m of lumber to the public. So what, for example, can be the weight of timber with natural moisture content of 150x150x6000 mm? To find out, you'll have to do a few simple things. independent calculations.
What determines the weight of lumber?
It is clear that the more moisture contained in the timber, the heavier it will be. However, the weight of such lumber depends not only on this factor. When performing calculations, in this case it is imperative to take into account the characteristics of the wood species itself. After all, for example, oak timber will in any case be heavier than birch lumber.
What is natural humidity
So, how do you calculate weight? wooden beam natural humidity 150x150x6000 mm of this or that breed? Making such calculations is actually not too difficult. However, before starting calculations, it is still worth defining the concept of “natural humidity”.
In construction and in the manufacture of various types of products, only wood with a moisture content of no more than 12-15% is used. And even such boards and timber are in most cases additionally dried for some time before use.
The humidity of only cut wood will, of course, be very high. In any case, its figure will significantly exceed 12-15%. It is this kind of humidity that is usually called natural. That is, we ultimately need to find out the weight of a standard-length wooden beam with a cross-section of 15x15 cm, made from freshly sawn wood.
We take into account the breed
When performing such an operation, information from the table of lumber weights in cubic meters should be taken as a basis.
Calculations in this case are performed as follows:
find out the number of beams of a given length and cross-section in 1 m 3;
by simple division calculate the mass of one such unit of lumber.
One cubic meter of timber having dimensions of 150x150x6000 mm will thus contain 1: 0.15: 0.15: 0.15: 6 = 7.4 pieces. To find out the weight of the beam, in this case you need:
look at the weight per cubic meter for this particular type of wood;
divide this parameter by the number of beams per cubic meter.
For example, with a humidity of 15%, 1 m 3 of pine lumber weighs, according to the table above, 440 kg. That is, the calculation in this case will look like this:
440 / 7.4 = 59.5 kg.
It is also easy to determine that the weight of a 150x150x6000 mm larch beam of the same moisture content will be equal to 90.5 kg. For aspen, this figure will be 67.6 kg.
Instructions for calculating the weight of timber with natural humidity 150x150x6000 mm
Thus, it is not too difficult to find out the weight of lumber of a given moisture content. To do this, you just need to solve two simple mathematical examples. But what will be the weight of a beam of natural humidity 150x150x6000 mm? In order to determine this, among other things, you need to know the last indicator itself for a particular type of wood.
You can also obtain such information from special tables. So, for example, the natural humidity of pine is 60-100%, larch - 50-70%, birch - 70-90%. These parameters should be taken in this case to calculate the weight. In this case, for obvious reasons, it will be impossible to make accurate calculations.
So, how much does a beam of 150x150x6000 mm of natural humidity weigh? Taking into account the data in the table presented above:
pine beams of such dimensions will weigh from 580/7.4=78.3 (60%) to 730/7.4=98.6 (100%) kg;
the weight of larch timber with natural humidity 150x150x6000 mm will vary from 820 / 7.4 = 110.8 kg to 930 / 7.4 = 125.7 kg.
In a similar way, you can calculate beams of such natural moisture dimensions for any other rock.
Specific gravity
There are only two types of wood density:
volumetric weight (density of the physical body of wood itself);
specific wood fibers directly).
Above we discussed a method for determining the volumetric weight of timber 150x150x6000. Natural humidity or specified in such calculations is an important indicator. Indeed, in this case, the weight also depends on the amount of moisture contained in the wood structure. But if desired, you can also calculate the specific density index for beams.
This can be done using the table presented above. Calculations in this case will be carried out without taking into account humidity. That is, to calculate you need to find the number of beams certain size in cubic meter and simply divide the indicator from the table by the resulting number.
Thus, for pine 520 / 7.4 = 70.3 kg is the specific weight of the timber 150x150x6000. Natural humidity - permissible operational or any other - is not taken into account in this case.