Restoration of the Sistine Chapel frescoes smoke and exhaust fumes of the city, being "much dirtier than the ceiling proper". The building was a little unstable and had already shifted considerably prior to Michelangelo's work of 1508, causing cracking of the ceiling, the crack in the "Judith" pendentive being so large that it had to be filled with bricks and mortar before painting. The upper part of the ceiling provided Michelangelo an irregular surface due to cracks and water seepage. Continued ingress of water from the roof and from unroofed exterior walkways above the ceiling level had caused seepage which carried down salts from the building
Sistine Chapel ceiling Julius who began the rebuilding of St. Peter's Basilica in 1506, as the most potent symbol of the source of papal power. In the same year 1506, Pope Julius conceived a program to paint the ceiling of the Sistine Chapel. The walls of the chapel had been decorated twenty years earlier. The lowest of three levels is painted to resemble draped hangings and was (and sometimes still is) hung on special occasions with the set of tapestries designed by Raphael. The middle level contains a complex scheme of frescoes illustrating the "Life of Christ" on the right side and the