Any person who had to build, when building a foundation, faced with a question regarding its strength, sufficient for the future home. In some cases, a strongly powerful foundation is not needed, but for reinsurance it is still made, which leads to additional costs. Under each building is the foundation with an adequate margin of safety. It can be calculated, and then with respect to costs it will become clear how much it costs to fill in formwork, which will serve the entire period of operation of the house.
The most common strip foundation, and if you already know the area of the future home, you can more or less accurately calculate the cost of its manufacture.
In that case, if this work will be done by an excavator, then calculate the cost of the work performed with it, within 250–500 p. for m?, thus, the calculation of the cost per linear meter depends on the depth of the trench and the hired equipment. If the work will be done independently, then you need:
- in the place where the trench will be dug, remove the turf;
- dig a ditch;
- install formwork;
- make a bed of sand (you can use clay, gartsovka, or crushed stone fines) and rammed;
- for waterproofing you need to lay geotextiles;
- Pour the concrete, compacting it with a vibrator (or stick).
Cost of materials
In the case of self-management, it will only be necessary to pay for construction materials, namely:
- Sand - 1970 rub. / M? (price depends on the quality of the sand and the place of extraction).
- Gravel - 3500 rubles / m ?.
- B15 concrete - 3500 rub. / M ?.
- Armature - from 25 rubles per meter, or reinforced mesh 50? 50 - 100 rubles / m ?.
- Geotextiles - 20 rubles / m ?.
Calculation of the required amount of materials
It should be noted that only large sand is needed, and the foundation cushion should be between 20 and 25 centimeters thick. To calculate the volume, you need to multiply the length, width and height together. But, at the beginning, all data must be converted to one standard, in this case to meters. If the trench width is 0.3 m and the filling height is 0.25 m, then one running meter will take 0.075 m? sand (0.25? 0.3? 1). If, for example, your house is 7 × 10 m, then, having calculated the length of the trench (10 + 10 + 7 + 7 = 34 m / p), multiply the amount of sand that is used up by 1 p / m (in this example, 0.075) by the total length of the trench (34 m / n), get 2.55 m?, that at the minimum cost in 1970 p. / m? will be 5023,5 r. Do not forget to add to this amount shipping cost. How much concrete is needed can be calculated on the same principle.
The amount of reinforcement to be purchased can also be calculated. Let's start with the simplest design, calculating the metal consumption by 1 p / m. Four rods are laid in the base of the frame, and every 15 cm with knitting wire, we need to bind jumpers, on which we take another 1 m of reinforcement for each of the seven rows. It turns out 11 meters, but you need to add another meter for unforeseen expenses and substandard balances. With this data, you can calculate the cost of pouring formwork for the entire structure.
In that case, if you decide to hire the services of professionals, then you need to find out from them., how much it costs to fill the formwork, considering that in this case you will have to pay not only for the materials, but also for the work. Such information is easy to get by going to the site of such firms. Work is estimated for 1 m? blind spots (not for a cube!) and according to the management of such enterprises, a third of the cost goes to salary and payment for services.
Having such data you can calculate the cost of pouring the foundation for your project.