Calculation of timber at home

Most suppliers of lumber indicate the cost of products in cubic meters. The calculation of the number of lumber or edging boards contained in a cubic meter of sawn timber is quite simple. In order to determine this value, you need to know the size of lumber. For example, the width is 150 mm, the length is 6 meters, and the thickness is 100 mm. How to calculate the cubic capacity of a bar? In order to find the number of logs in one cubic meter you need 1 m3divided by the volume of a unit of material:


This means that the amount of timber in a cube is 11 pieces.

How to calculate the beam on the house? In order to determine the amount of lumber for the construction of the object, you must perform several calculations:

Ceiling and floor beams

If the house will be built on unstable soils it is better to choose a monolithic base instead of the floor on beams. In all other cases, you can use a tree. Ceiling and floor beams most often have dimensions of 100 * 150 mm, with a step of 0.8-1 meters. The maximum rigidity of the structure is provided if the beams cut vertically into the rims.The total length and number of beams are calculated as follows:

we divide the length of the house by the step length between the tanks and subtract the unit. For a house measuring 6-10 meters, provided that the pitch is 0.9 m, you will need 10 beams (1 / 0.9-1).

The standard length of beams is 6 meters, 60 meters (6 * 10) will be needed for 60 meters. Given the fact that lumber is sold in m3, consider how to calculate the cube of the beam. In our case, knowing the cross section and length of the timber, as well as the running length, we get - 0.1 * 60 * 0.15 = 0.9 m3.


Rafter system

Consider the option with a gable straight roof. The rafter spacing is 60 cm, the angle of the roof is 45 °, the cross section of the material is 100-150 mm. Remember that the greater the angle of inclination, the lower the maximum mass of snow that can accumulate on the roof, but at the same time increases the windage of the roof. In windy regions, it is better to create a truss system with a smaller slope, in snowy regions - with a larger one. The less step rafters, the less you can choose their cross section. This is explained by the uniform distribution of the load. The device truss system is extremely simple - above the middle of the house are 2 truss legs. They are fixed by a longitudinal girder using a bar of the same section.With it connect the vertices of the triangles.

Calculation of cubic capacity of timber on the truss system

The house run is 10 m, the roof slope is 45 °, we calculate the length of the rafter foot (the sum of the squares of the legs) is 4.24 m. For each triangle, 8.5 meters of lumber will be required.


The number of triangles that make up the ridge of the roof - 10 / 0.6-1 is 16 (after rounding). The length of the rafters in this case is 16 * 8.5 = 136 m. To the resulting figure, we add a run of 10 m and we get 145 linear meters of material. With a cross section of 50 * 150 mm, we translate the linear meters into cubic 146 * 0.15 * 0.5 = 10.95 m3.

Experts recommend multiplying the received quantity by 1.3 (margin for trimming and overhanging).

Exterior walls, gables and internal partitions

We calculate the bursa at home, taking into account the fact that the same approach is used to determine the bearing partitions and external walls. Having presented partitions, walls and gables in the form of geometric shapes, we find their area. Next, we determine the area of ​​the opening and subtract it from the figure obtained earlier. The wall thickness is multiplied by the area and we get the total volume of the timber required for the construction of these structural elements. If you need to calculate the volume of the material, use the calculation algorithm above.


What is the weight of the timber?

This parameter depends on the type and moisture content of the wood.Humidity is the percentage of the water mass to the weight of dry wood. Humidity index depends on the duration of drying, as well as the conditions for further storage of lumber.


Dry wood is the one that has passed the technological drying or has been in a warm, dry room for a long time.

Raw wood is a material at the stage of drying from a freshly chopped state up to the equilibrium state.

Air-dry wood - timber with equilibrium moisture. When stored in natural conditions, the timber acquires moisture, balanced with the level of humidity.

Wet and freshly chopped wood is a material that has been in water for a long time or was recently cut.

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