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An online calculator for calculating the amount of timber per house can now be found on the website of any major building materials seller. But if for some reason the calculator is not available, how to calculate the amount of timber per house manually? Obviously, you will have to remember a half-forgotten school geometry course.
If several standard sizes of lumber are used during construction, the calculation of the amount of timber per house is carried out separately for each of them. Let's say, with timber 200*200 and internal partitions From a material with a cross-section of 100*100, we separately calculate the volume for the permanent enclosing structures and for the partition.
Negligible quantities
As you can see, without using an online calculator, it is not difficult to calculate how much timber you need for your house.
However, it is worth understanding that with the above calculation scheme we deliberately neglect some of the subtleties of construction:
- The actual volume of each wall will be slightly less than the calculated volume due to the fact that the rectangular parallelepipeds that represent the walls partially intersect in space;
- In addition, we completely neglect window and door openings (with the exception of panoramic windows from floor to ceiling).
The reason we ignore these points is extremely simple: none of these factors affects the volume of purchases.
As a rule, when designing and building a log house with your own hands, the dimensions of the structure are deliberately made multiples of the length of the lumber that is supposed to be used.
Additional sections are used in construction extremely rarely, because they:
- Reduce the mechanical strength of the log house and its ability to withstand deforming loads;
- They deteriorate the thermal insulation of the building due to blown seams;
It is worth clarifying: insulation strongly depends on the method of cutting adjacent sections.
A horizontal connection in half a tree is indeed blown by all the winds, but if you turn it vertically, in terms of thermal insulation the connection will be no different from a solid crown.
- They require unnecessary time spent on unnecessary connections.
reference Information
Lumber in large volumes is bought and sold by the cubic meter. The price is indicated by the seller exactly per unit of volume.
However, in some cases, the buyer needs to purchase a small amount of timber, measured in units. The most typical example is the purchase of materials for beams or floor joists: it is much easier to count the number of beams at a known pitch than their total volume.
In this case, the following table, which is relevant for a measured length of 6 meters, may be useful to him.
Examples of calculations
Problem 1
The instructions for performing calculations are already familiar to us; All that remains is to follow the above algorithm.
- The perimeter of the house is 6*4=24 meters. Square outer wall— 24*2.7=64.8 m2;
- The horizontal section of the beam in SI units corresponds to 0.15 m;
- The volume of the walls is thus 64.8*0.15=9.72 m3.
Problem 2
Let’s complicate the task, still without using a calculator: how to calculate the number of cubes of timber for a house measuring 12*12*3.5 meters, if the external walls are built from lumber with a cross-section of 250*250, and the internal cross-shaped partition dividing the building into four equal sections room area - made of timber with a cross section of 100*100 mm?
It is not difficult to guess that in this case the area of the external walls and the partition will be the same. Let's calculate this area: 12*4*3.5=168 m2.
Now we convert the thickness of the walls into SI values:
- 250 mm = 0.25 m;
- 100 mm = 0.1 m.
So, we will need 168*0.25=42 cubic meters of larger section material for the external walls and 168*0.1=16.8 m3 of 100*100 timber for the partition.
Advice: in practice, it is better not to increase them to improve their thermal insulation qualities, but to insulate the house from the outside with mineral wool slabs.
Thus the owner will receive better insulation at much lower costs.
Problem 3
- The height of its two floors is 6.5 meters;
- Dimensions - 6*12 meters;
- The thickness of the external walls is 200 mm (timber 200*200);
- The thickness of the partitions is 100 mm, the height is 3.1 meters, and their total length on both floors is 92 meters;
- The house has three floors on beams measuring 150*100 mm, laid in 1-meter increments.
Let's break down a relatively complex task into several stages.
- We calculate the volume of lumber for the external walls of the log house. It is equal to (6+6+12+12)*6.5*0.2=46.8 m3;
- We calculate the volume of material for the internal partition. 92*3.1*0.1=28.52 m3;
- We count the number of beams. When laying transversely, each floor will require 13 pieces (the first and last beams are located directly next to the walls parallel to them); for all three floors you will need 13*3=39 pieces;
Before purchasing any building material, it is necessary to determine the right amount as accurately as possible, otherwise you can lose some amount due to the remaining surplus or the need for additional purchases, as well as the unaccounted for the possibility of fraud by unscrupulous sellers. Beams, logs, boards and similar products from wood, as you know, they are sold in cubic meters, which means that you need to know in all the subtleties the calculations for determining the volume of these materials, as well as converting the required number of pieces into cubes and vice versa. And in the case of purchasing timber for building a house, when calculating the required amount of this building material, it is also necessary to take into account the design and features future construction.
Basic calculations - determining volume and converting from pieces to cubes and back
It is very simple to calculate the cubic capacity of timber, boards and similar lumber. To do this, you need to know the thickness, width (height) and length of the product. And, as you know from a school textbook on geometry, you need to multiply these dimensions:
V = T ∙ H ∙ L, where
V – volume of timber, m3;
T – thickness;
H – width;
L – length.
Dimensions before calculation should be given in one unit of measurement: mm, cm or m. It is better in meters, so as not to have to convert from mm 3 or cm 3 to m 3 later.
Timber size table
For example, let’s calculate the cubic capacity of a beam of 150x200. These dimensions, as you know, are indicated in mm. That is, the thickness of the product is 0.15 m and the width is 0.2 m. The standard length of timber and boards is 6 m (sometimes also indicated in mm - 6000). Or maybe another. But for example, let’s take exactly 6 m. Then the volume of this lumber is:
0.15 ∙ 0.2 ∙ 6 = 0.18 m 3.
Now you can convert the required quantity (in pieces) of this product into cubes. Let's say 49 pieces are required:
0.18 ∙ 49 = 8.82 m3.
Knowing the volume of one product, you can also calculate the cube of timber, that is, determine how many units (pieces) there are in 1 m3. To do this, you need to divide 1 cube by the cubic capacity of one product, already calculated or taken from reference tables (in the example under consideration - 0.18 m3):
1 / 0.18 = 5.55555... pcs.
The amount of this type of timber is calculated in the same way for any volume.
Nuances of calculations - how not to make mistakes and not be deceived
As follows from the above methods and calculation examples, it is very easy to calculate the required volume of timber in pieces or cubic meters. However, one must always remember that 1 cubic meter does not contain a whole number of these products. For the example given with dimensions 150x200, length 6 m - 5.55555... pcs. Unscrupulous, most often timber retailers, cleverly take advantage of this.
For example, you need 1 cube of this material from the example. The seller, of course, sells 5 products, but charges the amount for a whole cubic meter. The overpayment will be the cost of half a beam.
Let’s say that to build a house you need the same 49 beams from the example. And if the seller calculates according to the following scheme, then he will have to significantly overpay for the timber received:
- 1 cube – 5 products 150x200, 6 m long;
- 49/5 = 9.8 cubic meters payable.
This is a scam pure water for 5 units of timber. They are superfluous and unnecessary, but will be paid for but not received. In the calculation examples above, the data of 49 products has already been converted into cubes - this is 8.82 m 3. That is, a “particularly enterprising” seller will deceive an inattentive buyer by:
9.8 – 8.82 = 0.98 m 3 timber,
which is 0.98/0.18 = 5.44444... pcs. of this lumber (0.18 – the volume of one product calculated above).
Therefore, the most correct thing would be to calculate in advance exactly the number of units (pieces) of material, and only then, using this data and the dimensions of the timber or board, calculate their actual cubic capacity.
That is, in the case of purchasing one cubic meter in the example above, you must first decide how many beams you really need to take - 5 or 6. And then we calculate their cubic capacity:
0.15 ∙ 0.2 ∙ 6 ∙ 5 (or 6 pcs.) = 0.9 (or 1.08) m 3.
And for 49 units of this timber:
0.15 ∙ 0.2 ∙ 6 ∙ 49 = 8.82 m 3.
Then you will have to pay exactly for these 0.9 (1.08) or 8.82 cubes, receiving exactly 5 (6) or 49 products. Moreover, both the quantity in pieces and the volume in m3 must be indicated in the invoice for the timber sold by the seller.
Other features of calculating lumber cubic capacity
Another one important feature, which you should know for correct calculation cubic capacity of timber or boards when purchasing them. The actual length of lumber is usually always slightly longer than the standard or declared by the manufacturer of this product. So, instead of 6 m, the average length of the timber in question is, as a rule, 6.05 m. This is due to the fact that the ends of the lumber are not processed after cutting, which is why they may turn out to be uneven, go at angles, and be different, or simply be dirty. Of course, you don’t have to pay for these 5 cm. But some cunning sellers, although quite rarely, still try to take even this into account when calculating cubic meters, which is pure deception.
And regarding calculations for tongue and groove and profiled timber. The presence of tenons, grooves, and other protruding or chiseled places should not be confusing. Calculating the cubic capacity of such materials is no different from determining the volume of ordinary products that are even on all sides. For tongue-and-groove and profiled lumber, the rule is that only the main part (working width) of the product is measured and taken into account, and all structurally necessary and/or decorative elements are not taken into account in calculations. This provision applies to absolutely all types of timber.
Purchase of large volumes of materials - calculation of folded and dense cubic meters
When to purchase a large number of timber, their cubic capacity is calculated somewhat differently than discussed above. For example, timber and boards are needed to build an impressive, spacious house, as well as various other outbuildings near it. At the same time, the necessary lumber will certainly be available different sizes in cross section and length. Measuring and calculating each type of required material for such purchase volumes is an activity that can take more than one day.
For such cases, there is a specific calculation method. It is based on two important concepts:
- 1. Dense cubic meter of wood. This is the name given to a volume occupied only by wood and without voids or gaps in it. It is determined by measuring individual timber pieces individually, and then subsequently calculating their total cubic capacity.
- 2. Folded cubic meter. This is the name given to the volume occupied by lumber stacked as densely as possible and having voids, as well as gaps between individual wood products. It is determined by measuring the stack and then multiplying the dimensions of the latter. Moreover, in such a package the main amount of material should have approximately the same length, and the remaining products can be shorter, but not longer. It is allowed to have short lumber in the stacks, which should be stacked tightly one after another.
In order to quickly calculate the large volume of required purchased lumber, which has already been prepared and stored in the form of a stack, the latter is first measured and then its cubic capacity is calculated. This will calculate the fold cubic capacity. Then its value must be multiplied by a special conversion factor. The result will be a volume of only wood (a dense cubic meter), that is, exactly those materials that are purchased and will be paid for.
The value of the conversion factor is regulated by a number of standards for lumber: GOST 6782.2-75, 6782.1-75, 6564-84, OST 13-24-86 and others. For timber and boards, depending on their moisture content and the type of wood from which they are made, the value is in the range of 0.74–0.82.
We calculate the required cubic capacity of timber for building a house
- Height external walls, measured from the foundation level. Let's denote it as H.
- The height of the internal partition walls, if they exist and should be made of timber.
- The length of the outer and interior walls.
- Number and length of beams used in rafter system, as floor beams and, as well as in its other structures - if provided for by the project.
Then we select the thickness of the material for each of the above structural elements. For external and internal bearing walls depending on the purpose of the house being built and the region where it is being built. For non-load-bearing partitions - at your own discretion. The base (lowest) crown of external walls is usually slightly thicker than the rest of the timber for them. For other structural elements, the thickness of the material is selected based on its operating conditions, as well as the required strength of the structures in which it is used. In a well-drafted project, by the way, the thickness of the timber used for the walls, plinth crown, and other structures of the building should already be indicated.
Now all that remains is pure arithmetic. First, we calculate the perimeter of the house - add up the length of all its external wall structures. For a simple rectangular or square structure, you just need to add its width and length, and multiply the resulting value by 2. Then we calculate the cubic capacity of the base crown:
V C = T C ∙ Z C ∙ I, where
V C – total cubic capacity of basement lumber, m 3;
T Ts – thickness of the base product, m;
Z T – its width (height), m;
I – perimeter of external walls, m.
We calculate the remaining height of the external walls, m:
h \u003d H - Z Ts, where
H – total height, m.
We calculate the area of external wall structures without a plinth, m2:
If the thickness of the material of the base crown is the same as that of the entire wall, then the area of the latter, m 2:
We calculate the area of the internal walls, the thickness of the lumber of which is the same as that of the external ones, m2:
S B1 = H B ∙ L B1, where
H В – height of internal walls, m;
L B1 – total (total) length of internal walls, the material thickness of which is the same as the external ones, m.
We calculate the area of the internal walls, the thickness of which is different, m2:
S B2 = H B ∙ L B2 , where
L B2 - total length of internal walls, the thickness of the material is different, m.
We calculate the cubic capacity of the main lumber - for external walls and internal partitions made of the same timber, m 3:
V S = (S Н + S В1) ∙ Z S , where
Z S – selected product thickness, m.
We determine the volume of material for internal partitions from other timber, m3:
V B = S B2 ∙ Z B, where
Z B is the selected material thickness for these partitions, m.
We divide the results obtained (V C, V S and V B) by the length of the purchased lumber and its selected width (height). You will get the amount of material in pieces. We round this value to a whole value, and then recalculate V C, V S and V B, as described in the second chapter.
To save on lumber, you should calculate the total areas of window, door and other openings for the corresponding walls. Then their values must be subtracted from S H, S B1 and S B2, respectively. After this, we calculate V S and V B using the same formulas. Then we increase the obtained values by 10–20% - so that there is a reserve just in case.
The cubic capacity of the timber for the remaining elements of the house in which it is used is calculated even easier. Its total length is calculated and multiplied by the thickness and width selected for the material.
An online calculator for timber for building a house and other structures will allow you to quickly calculate lumber taking into account the size of the building. In accordance with the results obtained, calculations will be made for dowels, heat-insulating tape and the total cost of the material.
When developing an online calculator, a formula was used that takes into account the parameters of the timber and the dimensions of the building, including the dimensions of the pediment and their number. This allows you to more accurately calculate the material for building a structure of any complexity.
To perform the calculation, you must fill in the appropriate fields in the calculator form. First of all, data on the dimensions of the building is entered - length and width, as well as the height of the walls.
If the building has a complex shape, then in the “Length of additional walls” field you must enter the total length of all walls, excluding the building itself. For example, a standard residential building has a rectangular shape, but in the future a non-residential veranda, a barn and a storage room will be attached to the house. To fill in the field, it is necessary to measure the total length of all walls of additional extensions.
Preliminary calculations allow you to decide on transport and delivery of material to the site
If during calculations it is necessary to take into account the material for the gables, then you will need to enter data on the quantity, as well as the width and height parameters. When measuring the latter, the maximum values are taken.
Finally, data about the material is entered - its width and height. When filling out the corresponding fields, keep in mind that data on the parameters of the structure are entered in meters, and about the timber - in millimeters.
As a result, the online program will calculate the volume of building material needed, as well as its total weight, which will allow you to select the appropriate transport if you plan to deliver the material to the site yourself. Additionally, the calculation results indicate the number of crowns, the length of the rolled thermal insulation and the number of dowels required to fix the beam.
How to calculate without a calculator
In addition to special calculators and programs, calculation wooden beam can be done at home using simple mathematical formulas. Knowing them will help when performing preliminary calculation material on site when there is no Internet access.
Glued laminated timber is made from pre-prepared lamellas
As an example, we will describe the calculation of a beam measuring 150x150 mm for the construction of a house 6x8m with a wall height of 2.5 m. The logic of the calculation is as follows:
- building perimeter: (6+8)*2=28 m;
- area of the walls of the building: 28 * 2.5 = 70 m2;
- required volume of material: 70 × 0.15 = 10.5 m3.
When performing manual calculations, it should be taken into account that 10% of the material is taken as a buffer. This is necessary in order to protect yourself from shortages of materials during the construction process. If the calculations take into account savings on window and door openings, then this material can be taken as a buffer part without a 10% surcharge.
What kind of timber is used to build a house?
For the construction of residential, non-residential and ancillary structures, two types of timber are used: profiled and glued. Profiled timber - modern material, usually made from pine, spruce or larch wood. The timber canvas is made from solid logs without the use of chemicals or adhesives.
The outer part of the profiled beam can be either flat or semicircular. The upper and lower parts are made using the tongue-and-groove system, which ensures a more accurate fit of the canvas when assembling the building frame.
Glued timber is construction material from various types of wood, the production of which occurs by gluing wooden lamellas. Mostly slats are made of spruce or pine, a little less often - from cedar pine or larch.
Profiled timber is made from solid logs
If we compare both types of timber, the profiled one has greater strength, due to which its cost increases. In addition, profiled timber is more demanding during installation and further processing.
Glued beam has constant factor strength, humidity in the region of 10–20% and standardized appearance. In fact, laminated veneer lumber is more versatile, but when choosing, it is worth considering that the quality of the product depends entirely on the adhesive compositions used.
Depending on the size of the building, the following options are used for its construction:
- 100×100 mm – usually used for building small summer cottages, baths and sheds;
- 150×150 mm – used for the construction of permanent one-story housing and insulated cottages;
- 200×200 mm – used in the construction of multi-storey residential buildings and country cottages.
When calculating timber for a house using an online calculator, you can also find out its total cost. To do this, just enter the price per cubic meter of the product. When making calculations, you should remember that the data obtained are approximate values with which you can already contact the developer.
If you plan to purchase the material yourself, we also recommend that you carry out the calculation on paper using the formulas above.
Construction own home associated with solving many issues and problems. One of the key questions is how much will your future home cost? It is impossible to calculate without accurate analysis required material. It’s one thing if you decide to order construction finished house Full construction. The company will take care of the calculations. It’s another matter if it’s decided to build housing on our own. How to calculate the foundation? How much does it cost to build walls and roofs? How to provide your home with communications? Let's consider just one of the important components of the upcoming expenses - the calculation of timber for a house. There are many calculators on the Internet for online calculations of the amount of timber. But since we decided to build a house with our own hands, we need to understand this important issue.
Where to start calculating timber for a house?
Before you start calculating the timber for your house, you need to make several important decisions:
- determine the purpose of the future home,
- choose the material from which the house will be made,
- select a material supplier.
Let's look at each of the points. We did not mention the size of the house and its number of floors. To calculate materials, you must have a project with the exact dimensions of your object. Can be done preliminary calculations, so as not to make a mistake in choosing the size of the building that will be affordable for you.
Why is it important to know the purpose of your future home? The thickness of the walls you will lay will depend on this. For a spring-summer stay in country house a wall with a thickness of 90-100 mm is suitable, but for permanent residence a wall thickness of at least 150 mm will be required. Choice in favor of more thin wall will result in costs for insulation or heating of the house. Of course, you should also not forget about the dimensions of the building; the choice of beam cross-section will also depend on this.
The choice of material is simple. The calculation of walls made of edged, profiled or laminated timber has a number of features. The edged timber has the height and width that will actually be used for the wall. The profiled beam has a general size (it is according to these dimensions that you will have to pay the cubic mass to the supplier) and a working size (which is actually used to build the wall). The working size differs from the general tenon size, which can range from 5 to 20 mm. It might seem like a small amount, but when calculated for the whole house it amounts to a significant amount.
The choice of supplier before making calculations is due to the fact that there is no strict standard for the production of profiled or laminated timber. The overall dimensions of the material and the size of the tenon may differ. Probably everyone is also concerned about not only calculating the volume of timber for a house, but also calculating the total cost of the material. Don't rush into choosing the cheapest option. Low price is usually a consequence of low quality. But even a high price is not a guarantee of quality. It is better to choose a supplier with extensive manufacturing experience and recommendations from buyers or developers in your region.
If you do not take into account the dimensions of the house, then you need to start the calculation by choosing the dimensions of the beam, which can affect the project as a whole: a thin beam will not allow the construction of complex projects, and a more massive one will require a recalculation of the weight of the building and its load on the foundation. You may need to recalculate the quantity screw piles or tape depth.
Calculation for a house made of edged timber
Houses made from ordinary sawn timber are different simple projects, and calculating the amount of timber for such a house is a simple task.
First of all, it is necessary to calculate the number of rows of timber required to achieve the design height of the walls. To do this we use the formula:
The use of inter-crown seals will lead to a slight excess of the design height of the frame, but shrinkage will bring everything to the designated parameters.
Next, the total perimeter of the walls and partitions, which will also be made of timber, is calculated. Often thinner timber is used for partitions. For example, for walls a material with a cross-section of 150x150 mm is used, and for partitions - 100x150 mm. The height of the beam is always constant, so the number of rows for load-bearing walls and partitions will be the same. In this case, we calculate the total length of the load-bearing walls and separately calculate the length of the partitions. Now it remains to calculate the volume of the timber:
We separately calculate the volume for partitions and walls. Now all that remains is to sum up these volumes and multiply the result by the cost of one cubic meter. Now we know the cost and volume of a timber wall kit for our house.
Calculation of a house made of glued or profiled timber
Almost every manufacturer will offer you a free calculation of the volume of timber for your home. But what if you decide to compare two manufacturers who produce material of different dimensions, then it is better to do the calculation yourself, since the volume calculation made by the manufacturer may be subject to bargaining. If you do the calculations yourself, you will already be able to operate with the final numbers. Of course, they will be approximate, without deduction of window and doorways. And in the case of purchasing profiled timber by molding (without bowls and design), which is the cheapest material, there is no way to do without calculating the volume.
As in the case with edged timber, calculate the number of rows for a given wall height:
The key difference is that the calculation is performed based on the working height of the beam.
Now let's calculate the volume:
Here we already take into account the total height of the profiled timber.
To make it clearer for you, let’s calculate a very simple project:
A one-story log house with five walls measuring 6x6 meters. The height of the walls is 3 meters.
We will make calculations using profiled or laminated timber with a cross-section of 145x145mm.
Number of rows: 3000/130 ( working height) = 23 rows.
Total length of walls: 6*4 (perimeter)+6 (partition) = 30 meters.
Timber volume: 23 rows * 30 meters * 0.145 * 0.145 = 14.50 cubic meters
On such a small log house the difference is 1.5 cubic meters. Now you have an idea of the difference between the working and total height of the beam.
Operating school knowledge and basic information about the features of construction from timber, you will be able to accurately calculate the volume and cost of this material for your future home.
A log house is relevant, but not always convenient, since the walls need to be leveled with cladding; a wooden profile is much more practical, so sometimes it’s better calculate the amount of timber per house.
What do you need to know to calculate the amount of timber for a house?
– is this a little or a lot, and how many crowns of the house will this amount of timber be enough for? In fact, this is not such a large number of woodworking industry products. In particular, six-meter beams with a width and height of sides of 200 millimeters each will amount to only 4.17 pieces, or, since sellers like to round down, only 4 units. True, if you need more than 10 cubic meters, such rounding can play a cruel joke, and you will be missing one or even two lumber that you need so much. Therefore, you need to calculate the amount of timber per house as accurately as possible.
To begin with, determine the dimensions of the future building, that is, the length and height of the walls, the area of window and door openings, the step frequency of the crossbars (hardly in wooden house you will fill a monolithic concrete slab). You will also need to take into account the height rafter legs, and if the pediments are made in the same style as the building, then their geometry. In other words, immediately figure out where you will use the timber and include all the nuances in the calculations. Also immediately consider the options of using profiled, glued or unplaned beams; the latter are cheaper, but will decrease somewhat in size after processing on site.
Concerning overall dimensions, then from existing options with a section of 100x100, 150x100, 120x120, 140x140, 150x150, 200x150, 180x180 and 200x200 centimeters, the golden mean is usually chosen. Dimensions 150x150 fully meet the requirements for timber, both in terms of thermal conductivity and ease of assembly. Reducing the dimensions will lead to an increase in the amount of materials, and therefore to greater labor costs, even if the volume in cubes is the same. An increase in size will mean an increase in the cost of the timber and its weight.
Let's use the timber calculator in practice
Since rarely does anyone buy (and sell) lumber individually, when tens or hundreds of units of one type or another are required, we need to determine how many cubes of wood we need to purchase. To do this, you need to know the dimensions of the house, and since they are reflected in the plan, it is enough to include them in the timber calculator. Let's say a small country cottage is being built, 6x5 meters, with a ceiling height of 3 meters. It is best to buy an appropriate wooden profile, six meters long. Knowing the height of the wall, we divide it by the cross-sectional side of the lumber we have chosen. Since we previously settled on dimensions of 150x150 centimeters, we get 3/0.15 = 20 beams, which will make up the wall of the building.
It must be said that insulation is usually laid between the crowns, which should increase the height, however, the shrinkage of the wooden profile compensates for this error in our calculation. We add a plinth crown, which gives 21 beams, and then we calculate how many similar woodworking products will be produced in the entire building. To do this, we multiply the result we obtained earlier by 4 (by the number of walls). However, it is unlikely that there will be one room in the house, so a fifth wall immediately appears, an internal one, which can also be permanent, taking into account a minimum span of 5 meters. So, we multiply by 5. As a result, it turns out that 105 beams are needed to build a house. Too much? Let's see how you can save money.
Let us remember that the premises must have windows and doors, which mean the presence of significant openings. Let's say the entrance from the street is planned in a five-meter facade, exactly in the middle, and it will be exactly a meter wide. Since the crowns here are one meter shorter than the actual length of the beam, it turns out that we need 2-meter sections to form the doorway. Then from every two beams you will get exactly three crowns on this side. If inner door between the rooms will be on the edge, four-meter profiles will be needed there, the trimmings of which can also well be used to create an external opening. Thus, for every three crowns of this wall we save one beam until the lintel is laid over the entrance.
Sometimes the ends of the lumber from which the house is built are sawn in the form of tenons, in door and window openings rest against the groove of the riser, the width of which is equal to the thickness of the wall.
If the height of the door is 2.1 meters, we will have 14 crowns, that is, the remainder will be 4 six-meter wooden profiles. In the same way, you can save on windows by correctly arranging them in the overall layout of the premises, and then, quite possibly, you will no longer need 105, but some 98 beams. Use those that you can win for attic floor and fastening the rafters, since such material will not work as interfloor joists, you need a profile whose sides are in a ratio of 7:5, with the height being the first in proportion.
How to calculate a cube of timber for a house - the simplest method
We have already obtained the result necessary for further calculations, namely the number of wooden profiles that will be needed for construction. Now you need to determine how to calculate a cube of timber for a house, and how much lumber is needed. Knowing the dimensions of the woodworking product from which the crowns are knitted, it is not difficult to obtain its volume. In our case, this will be the formula V = h . b . l = 0.15 . 0.15 . 6 = 0.135 cubic meters, Here h- beam height, b– width, and l- length. Let's find out how many units of lumber are in 1 cube as follows: 1/0.135 = 7.41 pieces. They may not sell that much, sellers don’t like to cut six-meter beams, so they can reduce it to 7, or they will have to pay extra up to 8 beams.
But, since we need a lot of materials, and we know that the number of profiles will be integer, we calculate how many cubic meters of wooden profile will have to be transported to the site. We multiply the total quantity by the volume of one, let’s say we managed to save money and actually got 98 bars, then we get 0.135 . 98 = 13.23 cubes. However, all these calculations can be eliminated if you use the following table.
The number of timber in 1 cubic meter for calculating the beam on the house
[Section]x[length] beam, | Volume 1 pc., | The amount of timber in 1 m 3, |
|---|---|---|
You can take a simpler route. To do this, we calculate the perimeter of the house, multiply it by the height of the walls and get the total area of the outer surface of the building, excluding the roof. Next, we subtract the area of window and door openings if high accuracy is needed, or leave it as is if the savings are not critical. The calculation is completed by multiplying by the thickness of the timber. In our case short formula will look like V = P . H. b = 27. 3. 0.15 = 12.15 cubic meters excluding the base crown and based on the fact that 3 walls are 5 meters each. As you can see, this calculation is less accurate, since the length of all lumber is 6 meters, and we took many of them as five meters.
