How to make a Slab foundation? DIY step-by-step instructions + Video

How to make a Slab foundation? DIY step-by-step instructions + Video The slab foundation is the strongest and most reliable foundation of all known types, but it is also the most expensive ... The high price of such a foundation is due to the large amount of costs for concrete and insulating materials, because the size of such a foundation is equal to the dimensions of the base of the house.

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Foundation slab.

Pros and cons of a slab foundation of a house

Pros during construction

  1. The indisputable advantage of a slab foundation is that it makes it possible to build a frame house , in general, any building (heavy house, bathhouse, etc.), even on swampy grounds or peat bogs.
  2. The design of such a foundation, which is a monolithic reinforced slab, allows it to "float" on the soil surface, moving along with the migrating upper layer of moist soils. For this feature, the slab foundation was nicknamed floating.
  3. Difficulties in the construction of a slab foundation are associated, as a rule, with the moment of calculating the necessary materials.

  4. This kind of foundation-monolithic slab will become the floor for the basement of the house, which is quite convenient and practically profitable.

Disadvantages of a monolithic slab in the foundation

  1. Of course, this is high cost, not everyone can afford it. And although the slab foundation is the most expensive of all, it is not worth saving on its construction, because the stability and durability of the entire building depends on its strength.
  2. If you suddenly want to move a frame house, you should say goodbye to the foundation, unlike screw piles, which can be unscrewed and used again.

Erection of the foundation.

Installation steps

1. A slab foundation is a shallow type of foundation. After the main marking, a pit is dug on the building site. The slab foundation is arranged in such a way that it does not protrude much on the soil surface. The depth of the pit is calculated based on the following dimensions: the height of the foundation itself (20-40 cm) + the height of the sand cushion (at least 10 cm) + a layer of thermal insulation (up to 10 cm).

How to make a Slab foundation? DIY step-by-step instructions + Video
We fill up the sand. Align base

2. A sand layer is poured at the bottom of the pit, which must be carefully tamped. Some builders fill in a layer of rubble, but this is not necessary, it will still die into sand. The foam complex is also not required, but firms, in order to earn more, do with it.

Then a layer of waterproofing is placed, which can be used as roofing material, covered with an overlap and welded with a gas burner. Depending on the climate, a heat-insulating material (polystyrene or expanded polystyrene) is laid on the waterproofing layer. You should know that this foundation requires insulation not only at the base of the slab, but also from the sides of the structure.

How to make a Slab foundation? DIY step-by-step instructions + Video
3. The next stage is the construction of formwork around the entire perimeter of the future monolithic foundation slab.

How to make a Slab foundation? DIY step-by-step instructions + Video

Formwork boards are also covered with waterproofing.
4. Further, over the entire surface of the foundation in the form of a lattice, a reinforcement cage is laid from rods with a diameter of at least 12 mm. The rods are fixed together with a wire, the size of the windows obtained after a bunch of windows can be 20 by 20 cm. Or 30 by 30 cm.

How to make a Slab foundation? DIY step-by-step instructions + Video
Preparation of the framework before pouring concrete

5. When the reinforcement cage is installed, pour the concrete mixture. For a monolithic slab foundation, a sufficiently large amount of concrete is required.

If pouring the slab in one step failed to postpone the pouring of the second layer for a period of no more than 12 hours, otherwise the foundation may not turn out as strong as we would like.

How to make a Slab foundation? DIY step-by-step instructions + Video
We fill the slab foundation with our own hands

There is one more the option of erecting a slab foundation, when ready-made reinforced concrete slabs are placed throughout the formwork example, which are poured with a concrete screed.

However, this version of the foundation will be inferior to the monolithic in strength. In addition, for the laying of heavy concrete slabs, the involvement of special equipment will be required, which is unlikely to be more cost-effective than installing a slab foundation of a monolithic structure.

How to make a Slab foundation? DIY step-by-step instructions + Video
As soon as the concrete hardens and gains strength, the foundation for your future home is ready.

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