Why are the South-West walls made thick and the South-West kept high?
The South-West is the location of Rahu and Ketu, and the West belongs to Saturn. Thick, high walls keep the influence of Rahu-Ketu and Saturn from becoming excessive, which is why the South-West is never kept low.
Related questions
A client has an exalted Saturn and a debilitated Venus. Can the bedroom be made in the West?
Yes, it will be very good. With an exalted Saturn, make the bedroom in the West without hesitation; WSW or even SW can also be used, but when Saturn is exalted the West gives the best results.
A couple sleeps in the SW; one has an exalted Rahu and the other a debilitated Rahu. Can they sleep there?
Yes. After marriage, as in the hathleva ritual, the planets of one partner overlap the other, and the exalted planet's influence prevails.
Does Rahu in the 8th house also rule out a South-West bedroom?
Check only debilitation, not the 8th house. Not every 8th-house placement is bad.
Does being manglik stop a person from sleeping in the South-West?
Manglik has nothing to do with it. It is considered only at marriage matching, when Mars sits in the 1st, 4th, 7th or 12th house, and Mars is power, not inauspicious. For the SW check whether Rahu-Ketu are debilitated, and for the South whether Mars is bad.
If one family member has a planet exalted and another has it debilitated, should that planet's items be kept in the interior?
Decide room by room. In your own bedroom use the materials of your exalted planet and not of your debilitated one; your daughter's bedroom is designed from her kundli. The house facing and common areas such as the drawing room and kitchen are decided from the grih swami's kundli. Many people make the master bedroom in the South-West by default, which is wrong when Rahu is debilitated: such people suffered there and got very good results after moving to another direction.
In which zone should the chabutra (raised platform) be built?
Although it is not this class's topic, the chabutra is always built at the corner: in WSW, SW or SSW. All three belong to Nairutya: the southern Nairutya, Nairutya itself and the western Nairutya.