Does the relationship with the Vastu Devtas end once the vastu pooja is done at the start of construction?
No. A farmer who sows a seed does not end his bond with it there: he protects, waters and nurtures it until it flowers, fruits and grows into a shady tree, even a kalpavriksha (wish-fulfilling tree). In the same way, Indian architecture holds that a structure of stone and lime is not lifeless; prana settles into the building and its soil and controls the feelings of the people who live there, so the devtas established in the land must keep being nurtured.
Related questions
When do the Vastu Devtas have the greatest effect, and when should they be established?
Students answered griha pravesh and bhoomi poojan, which is only partly right: the greatest effect comes at the garbh vinyas or shilanyas, the day the land is taken over and the foundation is laid. Then the pishach, manushya, dev and brahma bhoomi are marked, the vastu pooja is done and every devta, 32 in the pishach bhoomi and the rest inside, is worshipped at its own place with its samagri, following the vidhi. A child cannot be born without a seed in the womb, and food works only through the mouth, not the ear or nose, so the biggest pooja, havan and sthapana belong to that day; building over the devtas afterwards is like tethering a cow first and then building its shed. Done later, remedies bring back only about 35% of that role, though even 5% is a lot.
Why did builders in earlier times leave the plinth for one season after the garbh vinyas?
After the digging and the garbh vinyas, the plinth beam was raised and then left for one season, about three months. The secret was to let the sun, the moon, the 27 nakshatras and the 9 planets fully work on the land whose devtas had been worshipped, so that the soil became charged and energised before building went on.
Are there 45 vastu devtas or 49?
There are 45 devtas, but 4 more devtas stand on all four sides to protect them, so basically there are 49. Bhog samagri is offered to these 4 guardians as well, after the 45.
At a bhoomi poojan, why is the first tilak given to the mason rather than the pandit?
Because the feelings (bhav) of the builder enter the building. Honouring the mason, contractor or Vastu consultant with tilak, good clothes and a coconut makes him work with joy, while a hurt craftsman's tears in the mortar bring repeated sorrow to the house.
Can crystallised quartz be used in a house or flat, and how much is needed?
Yes. In a house or flat, put it in the flooring, or in the soil filling when the floor is made. Use about 10 kg per 1000 sq ft for a normal area; to nullify a zone, double it or more, for example 2, 5 or even 10 kg for a 100 sq ft room that must be built in the wrong zone.
Can remedies done after construction fully activate the 45 devtas?
No. A lot of misleading talk goes around about the 45 devtas. The maximum remedy has to be done when the land is prepared and built on; the other remedies taught for later cannot activate a devta 100% and bring it only to about 30 to 35%.