Choose the types of stones to build your house
Granular accuracy: that is, the granules of these stones are small. The smaller the granule the stronger the stone.
Homogeneity: that is, all parts are of one kind so that the mass is solid one.
Easy to form: It is difficult to form solid stones according to will, becoming expensive after the operation because they need to spend a lot like stone flint.
If the stone is easy to sculpt, it can be operated for the desired purpose easily and a few expenses.
Clarity of palms: Stone surfaces are rough to accept adhesion with the mortar layers used against the soft stones that do not have this property.
Resistance to fracture and fragmentation: The more rigid the stone, the more cohesive the parts are used to be safe to withstand the great pressures that may be exposed to it.
Not affected by fluctuations and effects of air: Some of the stones of the effects of air to a large degree, long life, while others are affected by fragmentation parts and be of little value.
The substances circulating in the atmosphere contains some acids such as carbonic acid, sulfuric acid and azotec acid, which spread in the atmosphere of industrial cities, causing a lot of decomposition and disintegration of stones building in the atmosphere of those cities.
Carbon dioxide in the atmosphere affects stones containing low amounts of iron, and the same effect as acids does. This can be seen by looking at the old stone buildings in these cities.
If the air is pure, these stones are preserved and preserved for a long time.
The sand also affects the stones, and the heavy winds that may carry some sand materials, especially in the vicinity of the mountains and the desert, the sandy material works sandpaper, removing layer after layer of stones, but if the wind is nice it removes the dust on the façades of buildings.
Change in temperature and cold: If this change does not occur a stretch or a significant contraction, but the stones exposed to the sun live more than exposed to moisture. Therefore, the stone should not be used in the construction of any walls, one of which is exposed to great heat and the other to extreme cold.
Stone resistance: The stone resistance of the affected loads depends on their hardness. The effective pressure on any type of stone should not exceed 1/10 the crushing pressure of the stone, bearing in mind that the limestone blocks bear pressure between 30 and 150 kg per square centimeter.
Sandstones bear pressure between 100 and 530 kg per square centimeter.
Granitic stones bear pressure between 750 and 1300 kg per square centimeter.