I'm recently had a new home built in costa rica and we installed a metal corrugated roof andI have two questions for anyone with knowledge of metal roofing. 1) in the mornings when the sun begins to warm the roof, there's a good deal of popping noise almost as if the metal is expanding with the heat. Similarly at the end of the day it sounds as if the roof materials are contracting. Is that normal for a metal roof (assuming proper installation)??? 2) in the past two weeks we've also had some severe winds, again creating numerous popping and other sounds, almost as if the roof was lifting and creating a "waffling" sound. Any ideas?? Thanks.