How many cant we need to take home: examples of calculations

When building your own house out of wood, a lot of problems arise that need to be solved during construction. It can be questions both on the type of foundation, and on the roofing material, and on the optimum thickness of the walls - in a word, whatever. However, all these problems arise already after the construction began formally. Prior to this stage, the main task is being solved: how many cants should I take to the house?

Indeed, how much building material is needed to build a house according to an already completed project or idea? There are several options for calculations, each of which has its own accuracy.

Half-timber log

The easiest way

The easiest way to find out how much a bar needs for a house is to establish its quantity by volume. It means that the required volume of material is calculated immediately. Further it will become clear what exactly this method differs from others in, although the volume is considered in all.

Wood bath

So, the easiest way is to find the volume of all the walls. Since the walls are rectangular shapes, a simple geometric formula for a parallelogram can be applied, which everyone should know from the school bench: the length is multiplied by the width and multiplied by the height. Thus, is the volume of one part or all at once, if they have the same parameters.

Calculation example

To give an example of costing, you need to specify some source data. Let the house have a rectangular shape with several partitions, which are also made of wood. At the same time, the main walls of the house are made of bar 200 by 200 mm, and all partitions from it are the same, but 150 to 150 mm in size.

Suppose walls have the following parameters:

  • The total length is 30 m;
  • The width is 0.2 m;
  • The height from the foundation to the ceiling is 4 m.

It remains to set the conditions for partitions, we will set them:

  • The total length of all partitions is 5 m;
  • The width of the partitions is 0.15 m;
  • The height is equal to 3.4 m of each partition.

Tip! It is better to put all the partitions on the posts, that is, to start building them not from the level of the first crown, but from the floor level. This will help save on the foundation, since it will not be necessary to do it under the partitions.

The photo shows all the nodes of the frame house

However, often the lags themselves for the floor, as well as the partitions, mate with the first crown, that is, the first crown of the partition is embedded in the first crown of the bearing wall. This design is considered more reliable and rigid. In this case, the height of the partition will be the same as the height of all load-bearing walls.

So, now you can start working directly with the numbers:

  • First we find the volume of wood 20 by 20 centimeters for load-bearing walls, 30 m * 0.2 m * 4 m = 24 cubic meters;
  • Now we will find the volume for partitions, 3.4m * 5m * 0.15m = 2.55 cubic meters.

This calculation of the number of timber on the house is completed. It is now known how many cubic meters of wood is required.

Note! I must say that this method is quite inaccurate, but it also has a place to be, and we could not fail to mention it.

This is due to the fact that only the exact amount of wood is taken into account, that is, without waste.

However, in practice, a completely different picture.

  • For example, a material 5 meters long was delivered.
  • In this case, the wall has a length of 5 m, and the second only 4.
  • This means that a piece of 1 meter will be sawed off from each timber.
  • But he is also no longer suitable for other walls, which means that more material will be needed, but to say exactly how much timber you need to build a house, such a calculation is simply not capable.

Second type of calculation

As you can see from the previous example, direct volume calculation is simply not accurate. It is rather approximate and can only partially answer the question posed.

Square beam

More accurate calculations will be those that involve calculations not of the total volume, but of a partial volume, that is, for each individual element separately, taking into account their length.

So, to carry out the calculations, in fact, you need the same thing as in the past case, that is, to set the initial conditions.

Baseline conditions

Suppose there is a house with the following parameters:

  • Four walls bearing;
  • There are three others.

Let them have the following dimensions:

  • The length of the big two is 5 m;
  • The same indicator, but for the smaller two is 3 m;
  • The height of all is 4 m;
  • Width is 20 centimeters.
Conjugation above first crown

The first partition has the following dimensions:

  • The length is 1 m;
  • Width is 20 centimeters;
  • The height is 4 m;

The second and third have the following dimensions:

  • The length is 3 m;
  • Width is 20 centimeters;
  • The height is 4 m.

Now it remains to set the size of the imported bars. Let them have dimensions of 5 and 3 m.

Calculation example

So, let's calculate the volume of wood for the bearing walls, that is, for the box itself. We must find their volume.

We find it: 5 m * 4 m * 0.2 m = 4 cubes only for one. Since there are two of them, then the bar should be twice as large, that is, 8 cubic meters.

Then you need two others: 3m * 4m * 0.2m * 2m = 4.8 cubic meters.

Walls and partitions are level with the foundation

Then the entire box will require only 4.8 cu. meters + 8 cu. meter = 12.8 cubic meters of wood, rounded, we get a figure of 13 cubic meters.

Now we calculate the amount of wood that is needed for the device of the first partition.

Let us apply a different formula for this, since the length is 1 meter, and the beams have 3 m. We need to calculate the number of them.

To do this, divide the height of the wall by the thickness of one log: 400/20 = 20 pieces. A total of 20 pieces of 1 m are needed. Then, by dividing this quantity by 3, we get how many logs are needed in 3 m, that is: 20/3 = approximately 7.

Now you can find the volume of this material as 3m * 0.2 * 0.2 * 7 = 0.84 cubic meters.

Of course, one could simply calculate the volume, and it would have turned out to be about the same, but we would not know the necessary amount of wood. In our case, a three meter beam can be easily divided into three parts, one meter each. But in real life, such idealistic dimensions do not always happen.

Now find out the amount of material for the other two partitions. Since it is said that they are both the same, it is possible to make a calculation for one, and then multiply the resulting result by 2.

So, we get: 3m * 0.2m * 4m = 2.4 cubic meters, then on two walls you need 4.8 cubic meters, that is, 5 cubic meters of wood of 3 meters each.

The device of overlap of the beam of the same section as the main walls

As a result, we have that for the device walls and partitions you need:

  • 13 cubic meters with a length of 5 m;
  • 6 cubic meters with a length of 3 m.

On this work with the numbers is over. But it must be said that sometimes lumber logs and floor beams are made of the same wood, then their volume is calculated with their own hands in exactly the same way.

Tip! When buying a building material it is always better to take 5-10% more from the calculated. Even with the most accurate calculations, there is always a marriage, and, no matter how hard you try, you don’t achieve perfectly accurate results, so it’s better to be safe.

Having accepted all the above recommendations and nuances, you can easily calculate how much timber you need to a 3x3 bath, or a house, or a gazebo.

Material cost calculation

It is not uncommon to calculate the required amount of material with the sole purpose: to find out how much it will cost to build a house from a bar. If the purpose of the calculations lies only in this, then you still have to do the calculation of the amount of material, and then multiply the unit of this material by its value in a particular region.

Of course, the price in this sense does not determine the cost of the entire construction. If the purpose of the calculation is only in this, then many more trifles must be taken into account. For example, the cost of wood is one, but in order to install it you need to buy a heater, special noglins, and so on. Accordingly, it is necessary to make and the calculation of such material.

By making such calculations for each individual element, that is, for walls, for the floor, for the roof, for finishing and so on, you can find out how much you can build a house from a bar.

Calculation of the amount of material for the bath

As for such buildings as lumber baths and gazebos, then I must say that the calculation for them is no different from the same cost estimates for a residential house. The only exception that can be made is that in the bath, you can use cut pieces, for example, for the device lag.

This, of course, will lead to a reduction in the required amount of material.

Approximate bath planning with indication of all sizes

So, to find out how much timber you need to go to the bath, you need to plan the costs in sufficient detail. Knowing that even cutting pieces can go into action, you can plan in advance where to apply them, thereby reducing the amount of wood, and, accordingly, the cost of the entire construction.

So, summing up, we can say that the calculation of the quantity of timber on the bath is no different from the calculation for the house.


As you can see, the instructions for the calculation does not present any difficulties. Just need to take into account some features.

For example, you need to plan in advance places for:

  • Windows;
  • Doors;
  • Other niches, such as under the stove.

At the same time pieces from these openings can go to partitions, which also saves the necessary material.

When calculating the cost, it is necessary to take into account that the price for wood is different and it is advisable to make the calculation just before the purchase itself, so then it can simply change, which will be an unpleasant surprise.

Product quality is directly related to the price of the entire construction.

I must say that such actions in relation to the frame houses, baths and other buildings of this type are made in the same way. In addition, it is better and more convenient to do this in parts, that is, first the floors, then the floors, then the roof system, and so on until the very end.

A few words about ordinary logs. Mathematical calculations of their volume are made on the basis of the diameter. However, it is the same only for rounded logs, but for ordinary ones it is different. In the case of just such wood, one should look for the average value of the diameter.

Naturally, such calculations will be very relative, but this is better than no result at all.

A little more about the method of calculation will tell the video in this article.

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