Construction of a floating foundation

By Admin | Building
31 May 2016

Boards, or floating, foundations are quite common, despite the high cost and time consuming.This foundation protects against groundwater and rigid monolithic structure, made under the entire area of ​​the house, is not afraid of subsidence: a plate protects the destruction of moving along with the house.

Floating foundations are most often used in the water-bearing soil heaving heterogeneous, which include, in particular, and clay (typical for the central part of Russia).

In view of the large consumption of materials (concrete and steel), it is expedient to build floating bases in the construction of compact houses and other buildings (garage, bath) without a high plinth, in which the plate is used as a finished floor.For larger buildings often use cross-reinforced foundations like tapes or ribbed slabs.

device floating foundation

Member Forum "Home and cottage» ayupakhomov tiled building the foundation for a model project: the house of aerated concrete 8x8, with an attic floor, lined with brick.

before erecting founda

tion excavator removed the fertile soil, the sand was brought (it took more than 60 cubic meters) and the rubble, dug a trench width of 50 cm and depth of 70 cm. Sincetop of the sand backfill has been above the ground, gathered formwork - just in the size of the plate, and then to transfer it.

pit falls asleep under the input and output of water and poured half a day.Sand ramming layers vibratory plates.Then the builders moved the formwork in place and began to put insulation.ayupakhomov used Epps: functional, lightweight, hard enough, can be easily attached to the mounting foam.

Upon completion of insulation, for rigidity, poured concrete edge along the edges, covered rubble and zatrambovali.On a double layer of gravel laid a thick polyethylene film and poured concrete footing cheapest lowest grade - M-100.

valves for the first layer of reinforcement to crochet two people.Chairs and stars found in a local construction firm."Frogs" (rods, fixing the valve working) for the second layer of reinforcement made using a propane torch.

Two layers of reinforcement are placed on the bottom and top plates, vertically linked with each other and deepened in the concrete.For this backsheet reinforcement mounted on the clamps - plastic items desired height, and the upper plane of the plate is filled above the top of the reinforcing layer.To get a flat base plate, the side formwork put on a level, horizontally and pour concrete to its upper edge.

used for pouring concrete M-250.Due to the great height Fill - 80 cm - formwork reinforced oak and pine stakes diameter of 10-15 cm, cut the board from the pallet, iron pipes, with a pitch meter deep scoring them in the ground with a sledgehammer.

ayupakhomov advises not to save on the formwork: do not regret stakes and struts for pouring the foundation height greater than 40 cm!

Waterproofing extruded polystyrene foam made on each side, laying insulation to the sides and under the blind area, and then all covered with sand.Drainage forumchanin decided not to mean a low level of ground water, limiting livnevki.

In areas with a low level of ground water is better to use open drain or drainage passing along the surface (livnevki) - structure consisting of drainage gutters, grilles, peskosbornikov, trash boxes, road manholes and other elements that allow you to easilymount the drain.

the winter ayupakhomov planned to close the foundation foam, but changed his mind and decided to save money, and made a grid of wooden scraps for blowing the surface.


blind area - asphalt or concrete strip, designed to protect the basement from flooding and storm water and serves a decorative function.Make the entire perimeter of the building, having an obtuse angle to the walls.

Before the construction of the blind area and a half meters ayupakhomov took ground smeared with putty, primer, glued insulation.Then spiked sand, laid horizontal insulation, closed film on top of the foundation laid asphalt on the grid, missed mastic and tape (glassine not enough).

Later, after the construction of the box home, concrete, protruding from the ground, the owner plans to insulate and oblitsevat stone or ceramic tiles.

Construction period: From July to September the work was performed twice, at least - three or four person.On average, it spent about 25 working days.


  • formwork cost about 8000 rubles;
  • Epps - about 9 thousand rubles;
  • sand - 12 thousand rubles.(3000 - 12 cubic meters per car) with delivery;
  • rubble, delivery, cost as much;
  • concrete footing for the M-100 (2.5 cubic meters) - 7500 rubles.with delivery;
  • concrete M-250 (30 cubic meters) - 100 rubles.with delivery;
  • fittings - 55 thousand and 10 thousand - to different things: film, mounting foam, tools, binding wire and so forth.

on materials participants of the forum "Home and Cottage"