Foundation - the foundation of any structure.When planning the construction, should pay special attention to this part of the house.The destruction made the wrong foundation entails a violation of all the designs, so the savings in this matter is misplaced.The cost of the foundation under the house takes 30% to 50% of the work on the construction of the box structure.To be safe, the architects usually lay at the base of some planned margin.Calculate the cost of the foundation under the house only after you will have a plan for the construction, because the price of the work depends on the type of foundation and its technical characteristics.Also, the expert can advise on the appropriateness of a particular technology of erection of the base structure in each case.
What determines the cost of the foundation under the house
Foundation assumes the weight of the structure, and distributes it to the surface.Therefore, the worse the soil of their carrying capacity and heavier construction, the base should be thoroughly.Accordingly, its value will increase.For light it is advisable to build houses pile or pier foundation and heavy structures would have to arrange tape or solid foundation.The price of any type of base is directly related to its depth, which is dependent on the depth of the ground freezing.High base (above 20 cm) increases the consumption of materials to the foundation.In central Russia to equip base height of 40-50 cm. This is due to the amount of snow that fall in winter.Also problematic when the ground may require additional measures to divert drainage of groundwater, soil compaction.Before starting work, it is desirable to carry out geological exploration of the site.It costs about 2,500 rubles, and protect against many unpleasant surprises.
Types foundations
In depth distinguish:
- melkozaglublenny (0.4-0.7 m);
- flush (1.2-1.5 m).
The design of the foundation can be:
- belt.Melkozaglublenny strip foundation is widely used in individual housing developments, as the cost of the foundation under the house in this case is significantly lower than other types of foundations and load-bearing capacity is sufficient for most soils.Its not necessarily lay below the level of soil freezing, as it is "floating".
- monolithic.To equip a heavy structure, as well as if the cellar under the house is planned.Suitable for complex heaving soils with deep freezing.The cost of the foundation under the house with a basement is significantly increased due to costs of excavation and concrete.
- Stolbchaty: poured concrete footings in the ground at a distance of about 1.5 meters, they mounted grillage.
- Pile.Variety - the foundation on screw piles.A great advantage in speed of construction, as well as the ability to perform fast construction of the foundation under standard house.Its cost for buildings with a small area comparable to the cost of the tape base.
- Quarry - of stones held together with concrete solution.
- block - reinforced concrete blocks, sealed and filled with concrete reinforcement.
How to determine what is needed to build the foundation of the house
type and depth of the foundation determines the expert at the design stage.This takes into account geological exploration data and the weight of the structure.It is clear that the cost of the foundation under a wooden house is much lower than under the two-story brick house.Lowest cost will bring construction of the foundation on dry rocky and sandy soils, with sufficient depth of groundwater, with a low level of soil freezing in winter.Foundations have to spend for in the event that heavy soils with low bearing capacity (clay, loam), with high levels of groundwater in deep soil freezing in winter (reserve for frost heave of soil).
Carrier strength of soils DESC:
- rocky;
- clay;
- sand.
analyze examples on how to calculate the cost of the foundation under the house.Take the characteristics of an average strip of Russia: the freezing depth of soil - 80 cm, height 50 cm base, ground water below the freezing depth of 1.5 meters.House floor, with one interior bearing wall, size - 10 x 10 meters.
Strip foundation
lays the foundation around the perimeter of the house and under the bearing walls.Melkozaglublennye tape base usable for almost all types of soil.The cost of strip foundation under the house in this case is minimal.Raising them under the frame buildings and wooden houses.Recessed base type equip a brick, concrete and concrete houses."Floating" reinforced concrete strip compensates for all the good soil movement and has a large footprint.
Costing strip foundation
cost of strip foundation under the house consists of the following items:
- Earthworks: digging trenches.Length: 4 * 10 m + 10 m = 50 m. Width: 50 cm + 10 cm = 60 cm. Depth - 120 cm. The volume is 36 cubic meters.The cost of hand: 36 * 500 rubles = 18000 rubles.At this point, as a contract.Cheaper excavating (calculation of per meter): 50 m * 200 rubles = 10000 rubles.
- device sand cushion (20 cm).The volume of sand: 0.2 * 0.6 * 50 m = 6 cubic meters.At a price of 600 rubles get 3600 rubles.
- device crushed stone pillow (15 cm).0.15 * 0.6 * 50 m = 4.5 cubic meters.Multiply by 1,500 rubles, we get 6750 rubles.
- device casing: Board width 15 cm, thickness 20 mm, length - 6 m. Approximately 2.5 cubic meters.taking into account the scrap.Total 2.5 * 3500 rubles = 8750 rubles.
- reinforcement.Armature 12 mm 450 meters * 25 rubles = 11250 rubles.
- pouring concrete.Size: length 50 m * height 130 cm (80 cm + 50 cm) * width 50 cm = 32.5 cubic meters.With the price of concrete delivery of 2,000 rubles per cubic meter.get 65,000 rubles.
Total cost of strip foundation in this case is 105,350 rubles.
solid foundation
This type of foundation settling under heavy at home, as it has a high load-bearing capacity.It is the most lasting and durable, it is the only minus in comparison with discontinuous - no room for technical spreading room under the house.If you want to hide communication further settling Ribbon grillage.
Calculating the cost of a monolithic foundation
When assessing the cost of a monolithic foundation slab thickness of 30 cm into account:
- Earthwork - digging the pit.Volume: 10 m * 10 m * 0.65 m = 65 cubic meters.Price: 300 rubles * 65 = 19500 rubles.
- device sand cushion (20 cm).20 cubic meters.* 600 rubles = 12000 rubles.
- device crushed stone pillow (15 cm).Rubble need 15 cubic meters.It will cost 22,500 rubles.
- device casing.Board 20 mm, Volume: 40 m * 40 cm * 20 mm = 3.52 cubic meters.The cost is 12,320 rubles.
- reinforcement.Reinforcing mesh with a cell of 20 cm, must be 1020 m. The cost of 25,500 rubles.
- cost of pouring the foundation under the house: 10 m * 10 m * 30 m = 0.3 cubic meters.Price - 2000 rubles per 1 cubic meter.Total price - 60,000 rubles.
total cost of a monolithic foundation is 151 820 rubles.
helical pile foundation
foundation is laid below the freezing depth.Well proven in the non-uniform, marshy and "floating" soils.Metal piles with helical ribbon is welded to the rod, is screwed into the ground at a distance of about 2.5 meters apart.The blades of the pile should be based on a dense layer of soil.Top equips concrete or metal grillage linking support each other.For the arrangement of this type of foundation is not necessary to align the plot, loosely placed inside all communications.Not suitable for rocky soil, building houses with a basement, for it is necessary to build additional base.
Calculating the cost of a screw-pile foundation
Calculating the cost of the foundation under the house on screw piles follows.
- cost of driving.Piles 2,5 m long, 14 pcs.* 1850 rubles = 25900 rubles.
- Screwing piles, in principle, can be performed independently.When referring to the construction companies setting a pile cost about 1,500 rubles.In this case, a screw-pile foundation will cost about 50 thousand rubles.
- Welding work: pruning piles Weld tip.
- Construction of raft foundation.There are two options: welded metal channel or fills reinforced tape.Shortchange version with belt reinforced concrete raft foundation height of 50 cm, a width of 0.5 cm: 12.5 cubic meters of concrete.It will cost 25,000 rubles, formwork - about 3000 rubles.
just a screw-pile foundation will have to pay 53,900 rubles.Add in travel and what time you will manage to welding.
Expenses for the construction of any foundation and added value of water and heat insulation.Currently, the market offers a variety of materials to meet the various demands of customers.
