Dr. Sharma delivers a severe Vastu and lifestyle warning for a fixed, karmic (Grahphal) Rahu in the 12th house.
When a planet is "Grahphal" in Lal Kitab, its results are fixed and traditional remedies (donations/pujas) do not work. The only remedy is behavioral change.
For Rahu in the 12th, the native's own home, and specifically the roof (which represents the 12th house/Rahu), becomes a source of extreme mental torment and bad luck. Dr. Sharma advises that to find peace and success, they must move away from their birthplace ("ghar se door raho") and absolutely avoid living in a rooftop room or spending time on the roof ("chhat pe na raho").