How to calculate the cubic capacity of timber for building a house

When making a scrupulous calculation of timber per house, use an online calculator to check the exact amount of wood purchased.

Then you will not have to overpay for the delivery of lumber purchased for the construction of houses, baths, summer cottages and other capital buildings.

The purpose of the calculator, its advantages

It is difficult to calculate the exact amount of timber on your own, to reach the total volume of all the necessary positions. Not only the width and height of the timber are taken into account, knowing the total length, the height of all walls, but also the density of the wood.

Then, having reached the quantity and volume of the required timber, knowing the price for 1 m 3 of purchased lumber, you can automatically immediately calculate the total cost of wood for a particular house or bath.

It is important to know: Initially, correctly determine the building material. The timber is not only profiled, but glued.

It is easier to see the exact data on the lumber used in the construction estimate, which indicates the dimensions, the original name of the materials. Marking, section of blanks.

How to use


An accurate calculation of the required lumber using an online calculator can be performed only if you know all the technological features of the buildings under construction and the cross section of the timber.

The calculator already has an automatic calculation algorithm. Therefore, by entering the requested data, you can immediately get to the amount and total volume of wood processed from all sides.

Note: knowing the parameters of the section of lumber, the length is taken within the standards - 4.5 m; 5 m or 6 m (depending on the round timber).

Types of timber, application

For the construction of houses, timber is mainly made from coniferous wood (pine, spruce). The building material can be with a front straight side, or have a D-shaped appearance, which will imitate the construction of rounded logs.

If for the construction of a bath you can get by with a square section of 100x100 mm, then for capital buildings during the construction of one-story houses, cottages, a bar with a section of 150x150 mm is purchased, and for two-story cottages, taller buildings, you will have to purchase lumber with a section of 200x200 mm or more.

Careful grinding is performed on the side that will face the residential part of the house. Then you do not have to additionally deal with the decoration of wooden walls.

Calculation of cubature

To make it clear, consider an example of calculating the cubic capacity of a beam for a one-story cottage with dimensions of 8x6x3 m. The building also has 1 internal partition of 6 m.

First you need to calculate the perimeter: (LxS) x2 + S1 \u003d (8 + 6) x2 + 6 \u003d 34 m. The total area of ​​​​the building is calculated using the formula: 34x3 \u003d 102 m 2. Where 34 is the perimeter of the walls, 3 is their height. Multiplying the result by the parameter of the side of the beam, we get the total volume: 102 * 0.15 \u003d 15.3 m 3.

When calculating, it is essential to take into account the openings in the walls - this will significantly save money, not to purchase extra building material. It is recommended to use project drawings and diagrams for accurate calculations.

Which bar is better to use

It is worth buying affordable lumber, represented by coniferous species of high-quality wood that have been processed and naturally dried.

Profiled timber is purchased in standard sizes with a section: 100x100 mm, 150x150m, 200x200 mm and a length of 4 m to 6 m or more. The glued timber used in construction, called lamellas, is pre-sawn into boards. This material is subjected to planing and special drying, at the output it has a wood moisture content in the range of 8–9%.

After sorting, the dried boards are glued together on a hydraulic press, forming a glued beam. In the technical process, water-resistant special composition of glue is used. The most durable among the two types of sawn timber under consideration is glued laminated timber, which is recommended in capital construction.

Calculation of material for floor and ceiling

Rafters, beams used in the arrangement of the ceiling, floors are quite suitable with a section of 100x150 mm. Knowing the exact dimensions of the future building, it is easy to calculate the lumber for the ceiling and floor.

If the installation step = 1 m, 7 beams can serve as lags, the length of which is 6 m each, including 7 beams with the same length, will be prepared for arranging the ceiling. In general, 14 beams or 84 p.m. When calculating the required amount of lumber, the resulting length is multiplied by S sec. , and we get 84 * 0.015 \u003d 1.26 m 3.

It is also necessary to take into account the possible percentage of out of condition, which, on average, can be up to 5% of the total purchased timber.

Roof calculation

When calculating the required amount of timber for arranging the roof, it is necessary to clarify the type of roof in advance. If this is a gable type of roof, it is necessary to find the optimal angle of inclination for the mounted structural elements.

As a rule - in the ridge the roof will have 45%. The mounting step of the rafters is a distance of 0.6 m. This type of fasteners is made on the basis of a bar with a section of 100x150 mm. The leg length of the rafter beam is calculated using the Pythagorean theorem. The hypotenuse of the formed triangle is the width of the house, and the rafters are the legs.

The length of the legs is 4.2 m. The length of the house is divided by a step and 12 beams are obtained. Knowing the cross section, we calculate for the roof - it will take 1.51 m 3. It is worth adding about 7 - 8% more for an even account for technical needs and possible non-condition.

Keep in mind: when installing a roof with a smaller distance between the rafters, it is permissible to use a smaller section of the timber.

In order not to be subjected to tedious calculations, use a popular online calculator. A free service will protect you from inaccuracies, allow you to insure yourself against inevitable miscalculations, and will not make mistakes.

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