Calculation of iron and wood needs to be done in the following way, before building a house you should make the first foundation

1) The need for reinforcement steel
To calculate the iron needs, need to carefully look at first pieces of image detail the type of a concrete slab foundation.
Length of iron in each lane is identical to the mobile section on the foundations of cross-sectional images of the foundation. Then the foundation footprint width divided by the distance of iron (among 15-20cm), then calculated the number and multiplies it by a long iron from each section. When the diameter of the iron does not count the construction account should use the 12 mm iron with the distance from one lane to another lane is 15 centimeters horizontal and vertical direction. | To find the amount of iron requirements in set pieces, the length of one lane of iron divided by 12 because of the long iron on the market is 12 cm. When will save the purchase of iron, long iron needs to be reduced by a thick blanket of concrete 2.5-5cm to the right and left.

2.) Requirement for timber formwork
at the foundation of local bony plates, rectangular timber made just for casting or mortar to hold it. Height of the rectangular area is equal to the thickness of concrete slab. Thus, if the width of the foundation treads of 1.2 m x 1.2 m, the wood needs are a board size of 2 cm x 20 cm, 4.9 m. This figure was obtained from (1.25 m x 2 pcs) + (1.2 x 2 pcs) = 4.9 m, while the figures obtained from 1.2 m 1.25 m + 5 cm to the field where the nail. Thus, the size of the field remains 1.2 m.

Advantages and disadvantages

When using the local slab foundation type, there are several advantages that can be obtained, as follows.
1. Lower cost

2. Fewer excavation because only done at a point in the column just for the installation of foundation structure

3. For multistory buildings, the use of this foundation is more reliable than the foundation stone or cut stone.

Besides its advantages, there are also some deficiencies are often faced when using local concrete slab foundation type, as follows.
1. Should be prepared formwork or mold first so that a longer preparation.

2. It takes a long time because it must wait until the casting according to the age of dry concrete.

3. Not all builders can work on making this kind of foundation.

4. It requires an understanding of the science of structure.

5. Work-iron frame is made from scratch when digging the soil so the soil should be completed after the excavation is complete.