How can the plaster ceiling be installed and the grille lamp fixed on the gypsum board?
If the installation location is not keel, then only in the top surface of a small opening, and then put a carpenter board up and fixed, and then install the chandelier.
If there is a keel installed location, then the weight of 2 pounds, installed on the keel, the problem is not large, but it is best to fix a wood board above the plaster board;
Yes, it's extra. The difficulty of construction has increased. In general, each lamp hole 30-50 yuan range. In the air and reserved sub grille position, and is the best outlet grille lamp first accurate size!