Q: Which are he necessary steps to be taken to construct basement?
Ans: Basement is the best to make it at the north or east side. Never should it be done at the south or west side and height of the basement should be 9 feet at the least.
If the basement remains completely under the normal level of the land then desired solar ray will never enter. So 25 percent of the basement height should be over the normal level of the land. In such case solar ray up to noon will be able to enter the basement without any resistance. Design of basement should be done accordingly. Big size mirrors should be used to enter solar ray through refection in the basement. This increases power of Vastu in the basement. Ailing person should not remain in the basement.