The first step and the most important thing in building a house is the foundation, where the quality of the foundation will greatly affect the strength of the building that stands on it. Many people make wrong steps in building the foundation without a good plan or execution, sometimes the results are not good because the function of the foundation itself is to support the overall weight of the building and continue the load of the structure safely.

In the process of building the foundation, it must be done in detail and neatly, so that the foundation and building are more solid. strong, stable and durable. A strong foundation is certainly not done carelessly, therefore knowing the foundation of the house is very important, For foundation work, a good selection of stone can use the type of river stone, the specifications of this foundation are river stone, there are many advantages of using river stone for the foundation, namely Soil retaining is retained, has very strong resistance, relatively fast workmanship, and to raise the level of the floor surface. In the implementation of foundation work there are several activities carried out including:

             Bouwplank is one of the most important jobs, this bouwplank is the key to straightness, when the bouwplank is wrong in building work, the building will be damaged. The steps in the boowplank work are

• Determine the building area and set a bouwplank benchmark
• Install bouwplank poles on every corner of the building
• Measure the height of the foundation using a waterpass
• Plank nails surround the foundation on each bouwplank benchmark
• Then attach the nails to the board and attach the thread to the nails, pulled to form a foundation
• And continued with the process of excavating the soil

2. Foundation Hole Digging Process

Soil excavation is adjusted to the size of the bouwplank installation, to obtain results that are parallel to the excavation of the foundation soil by following the threads that have been linked to the boowplank board.

3. Installing the Foundation Sloof

In making sloof there are 3 types of materials, namely: Iron, sand, split stone and cement, and then mixed, this casting technique is done with a good selection of stones selection of the type of stone used for casting there are various forms there are sharp, large, and small stones, and the best is using a small type of split stone because it will be very easy to stir it,  and in addition to the use of split stones Sharp stones and large stones will be less good. and the use of the type of sand using black sand. For steps in making sloof include:

• Stringing iron for example using a size of 10ml
• Measure the need for iron length according to the length of the framed house sloof
• Iron is placed on the foundation and pieces of iron are exaggerated at both ends, to lock the sloof with each other to facilitate work before assembling
• Cut the iron gel and make it into 6. To string the iron sloof
• Lock one iron frame to each other by adding iron poles on the corner sides.

4. Formwork Board

• In installing the position of the iron and formwork board must really fit on the foundation
• After you feel the right size, then stick the formwork board next to the right and left iron sloof, for the inside of the formwork add pieces of wood size 2×5 so that they are straight parallel to the top and bottom positions
• Lock using 2×5 size wood so that when casting it is not easily shifted
• Water the surface of the formwork and iron frame so that it is clean when casting, in casting the mortar must be slightly wet so that it absorbs faster and enters the cavity above the foundation, wait for it to dry and the formwork board can be removed.

5. How to Install Foundation Stone

After the above series is carried out, the stage carried out is how to install the foundation stone.:

• All foundation holes are filled with sand approximately 5cm thick, the function of this sand is not to easily crack during an earthquake and friction in the ground.
• Arrange the stones and arrange neatly
• Reinstall the thread in it, for stone installation, so that the foundation is straight and parallel, take a slope for example 10cm. The slope of the foundation depends on the height of the foundation installed, to get good results, the thread installation is again installed on the right, left and up to the hole, in the slope of this foundation use 3 layers of thread so that the slope on the foundation is really straight.
• In the installation of the stone foundation, the side positions are arranged first on the right and left by taking good stones for outside the foundation
• Then for the middle position take a small stone so that the foundation cement is really solid and strong. All the stones that have been arranged and try to cover all the empty gaps with cement So that the foundation is not easily cracked for a long period of time, and for the top of the foundation insert a small and thin stone to seal all cavities.
• After the installation of the stone is high, it is allowed to stand so that the cement hardens so that the stone does not break easily
• After the foundation is completed, the top is tidied up using sand dough, cement so as not to bubble when casting sloof.

After everything is neat, it is necessary to make lines above so that when casting, everything will easily stick to the river stone foundation.