Construction of the foundation for an extension to the house

Many homeowners are often faced with the problem of the construction of an extension to the house.It becomes necessary, if you want to expand your living space, expanding it with additional facilities.Construction of the foundation for an extension to the house has its own characteristics unlike the technology in new construction.Here, it is required to find a method to dock with the old base, so that it was safe.

What are the ways

foundations ligament Today there are two main ways of pairing bases.The first method is based on a rigid connection technology using steel bars.It is used in the event that the foundation is already well-established, and further precipitate does not threaten him.In this case, you must calculate the new foundation, which is to show that it does not hang on a new foundation, and will not cause more rainfall in excess of allowable values ​​at home.Read robust rigid docking bases is only permitted when the soils in the area are not heaving.Otherwise, do the pairing for this technology impractical.

device of such a compound is made by the following technologies:

• Initially set by the type of foundation under the house, it is a tape or columnar.It is also important parameters such as the depth of the linear dimensions.The depth is measured once dug a hole near the wall up to the foot of the basement.To measure the width will need a metal rod or wire, which end is bent at 90 degrees.Sticks or hammered him in the foundation, if necessary, so that the hook was horizontally relative to the surface plane of the base.Then we turn it into a vertical position, and tighten all the way to the back wall of the basement.Then you need to make an incision at the level of the rod outer wall.Then, extract the rod, in reverse order all the previous steps.The distance from the edge of the rod to the left of you and will mark the foundation
• width is worth noting the fact that the soil puchinostost different effect on different types of foundations in design.For this reason, if the house has been arranged under the belt type, and for its extension to do the same.It does not matter that the walls of the foam blocks light enough.A new foundation is laid at a greater depth than was laid old.
• in mating places in the old monolith drilled holes on diameter slightly larger than the diameter of the valve.There is a rule that the depth of these holes must be equal to 35 diameters used fittings.Outside should be twice the size of the rod than it will fit inside the old foundation.This is the working length.
• If the base is not very wide and it is not enough to comply with these conditions, the holes are drilled to the middle of the basement.This hammered rods should look like anchors.To do this, cut them lengthwise and inserted into the gap formed wedging liner.Such a method will allow securely rebar inside the concrete monolith.
• then calculates the required number of reinforcing bars.The closed loop of the new foundation is to use 5 rods 0.25 m2 base of the wall.Rods are cut emery grinder or machine in an amount that depends on the width of the base of the future.Now, the bars should be prepared to drive in the pre-drilled holes and welded at their ends a small washer.
• After that you can safely fill in the prepared foundation formwork.In this fixture on the exterior, it is tightly immured in the body of the new base.

Let us consider the second way to connect the two foundations.It is based on the use of the expansion joint between them.

pair the foundations in this way is much easier and cheaper.In this case, the following sequence of work:

• where needed constructed a separate foundation, which is in close proximity to the old.He may not be as powerful as the main, however, it is also necessary to carefully calculate to make it durable and reliable.The distance between the two foundations should be about 5 centimeters.This can be achieved if we put in places conventional pairing the board of the necessary thickness, which are wrapped with roofing material or plastic wrap.Harvesting them is not necessary after the completion of construction.
• If the soil is too distending, the floor in the annex should be slightly below the floor in the house, just on the value of the expected deformation.In the construction of buildings, which does not exceed the number of floors 2 levels, between the walls, you can observe a distance of 2 cm.
• gap between the base and the walls are filled with any insulation.Earlier for these purposes it is mainly used tow, but today there are many modern materials, among which the most popular are mineral wool and polystyrene.After foaming and insulation joints are sealed weatherproof elastic sealants, and the place the connection cover decorative plates, attached to one of the walls.Most often, this wall is selected capital building.

How can we build a foundation for the extension

If you choose to use the first method, the base will have to do the same as under the main house.This involves creating a technology foundation with the use of such a method of conjugation of two reasons.If you choose 2 ways there are no restrictions on the type of foundation, the main thing that they were comfortable and economical.It fit the belt, columnar, and the foundation on screw piles.

necessary to make some of the work before the start of the construction of the base When the self-laying the foundation.It is desirable in the beginning to consult a specialist, who will give you advice on choosing the optimal type, and provide estimates of its reliability.Then you need to make a plan area and mark it on the contour of the future installations.To do this, trying to drive the pegs in the corners and stretch the cord between them.Be sure to calculate the diagonal of the formula area: c = √ (a² + b²), where a and b - side and on - its diagonal.Rope length is measured from the first diagonal and checked for compliance with the size of the second diagonal.If you need to make adjustments.Similarly, the internal layout is made after the foundation perimeter to retreat deep into the desired width.Difficult foundation is marked by division into rectangles, which are calculated separately.After marking carried out earthworks.

most important moment in the construction of an additional extension to the house is the choice of the design of the foundation and competent pairing it with the old.If we look at the economic side of the issue, the pairing hard way will be much more expensive than the connection via the expansion joint.Anyway the construction process of the base is very responsible, and its complexity increases with the age of the building.