EVERYTHING YOU NEED TO KNOW ABOUT METAL ROOFS!
No. Actually I have found the opposite to be true as long as a few things have been thought about prior to your metal roof install. Is the color of your roof one that is typically considered attractive? Does the style of the metal roof you are installing match the style of the home you are installing it on? Is the company you are having install your roof a quality company that is backed with years of experience?
Yes. We have over 2,000 locally installed metal roofs and roughly 95% of them have been installed over shingles. You will need to check with your local building department though. Some towns allow you to install over 2 layers of shingles while some just allow you to install over 1 layer. You always want to check the integrity of the decking underneath the existing shingles to make sure nothing is rotten before installing your metal roof.